Merge branch '64505-add-rubocop-cop-to-enforce-string-length-on-migrations-ee' into 'master'

EE port of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/31433/

See merge request gitlab-org/gitlab-ee!15534

db/migrate/20171230123729_init_schema.rb

@@ -5,6 +5,7 @@
 # rubocop:disable Metrics/AbcSize
 # rubocop:disable Migration/AddConcurrentForeignKey
 # rubocop:disable Style/WordArray
+# rubocop:disable Migration/AddLimitToStringColumns
 
 class InitSchema < ActiveRecord::Migration[4.2]
   DOWNTIME = false
@@ -1852,3 +1853,4 @@ class InitSchema < ActiveRecord::Migration[4.2]
     raise ActiveRecord::IrreversibleMigration, "The initial migration is not revertable"
   end
 end
+# rubocop:enable Migration/AddLimitToStringColumns

db/migrate/20180101160629_create_prometheus_metrics.rb

@@ -4,6 +4,7 @@ class CreatePrometheusMetrics < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
+    # rubocop:disable Migration/AddLimitToStringColumns
     create_table :prometheus_metrics do |t|
       t.references :project, index: true, foreign_key: { on_delete: :cascade }, null: false
       t.string :title, null: false
@@ -14,5 +15,6 @@ class CreatePrometheusMetrics < ActiveRecord::Migration[4.2]
       t.integer :group, null: false, index: true
       t.timestamps_with_timezone null: false
     end
+    # rubocop:enable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20180122162010_add_auto_devops_domain_to_application_settings.rb

@@ -8,6 +8,6 @@ class AddAutoDevopsDomainToApplicationSettings < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
-    add_column :application_settings, :auto_devops_domain, :string
+    add_column :application_settings, :auto_devops_domain, :string # rubocop:disable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20180129193323_add_uploads_builder_context.rb

@@ -8,7 +8,9 @@ class AddUploadsBuilderContext < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
+    # rubocop:disable Migration/AddLimitToStringColumns
     add_column :uploads, :mount_point, :string
     add_column :uploads, :secret, :string
+    # rubocop:enable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20180212030105_add_external_ip_to_clusters_applications_ingress.rb

@@ -4,6 +4,6 @@ class AddExternalIpToClustersApplicationsIngress < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
-    add_column :clusters_applications_ingress, :external_ip, :string
+    add_column :clusters_applications_ingress, :external_ip, :string # rubocop:disable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20180214093516_create_badges.rb

@@ -2,6 +2,7 @@ class CreateBadges < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
+    # rubocop:disable Migration/AddLimitToStringColumns
     create_table :badges do |t|
       t.string     :link_url, null: false
       t.string     :image_url, null: false
@@ -11,6 +12,7 @@ class CreateBadges < ActiveRecord::Migration[4.2]
 
       t.timestamps_with_timezone null: false
     end
+    # rubocop:enable Migration/AddLimitToStringColumns
 
     # rubocop:disable Migration/AddConcurrentForeignKey
     add_foreign_key :badges, :namespaces, column: :group_id, on_delete: :cascade

db/migrate/20180214155405_create_clusters_applications_runners.rb

@@ -13,7 +13,7 @@ class CreateClustersApplicationsRunners < ActiveRecord::Migration[4.2]
       t.index :cluster_id, unique: true
       t.integer :status, null: false
       t.timestamps_with_timezone null: false
-      t.string :version, null: false
+      t.string :version, null: false # rubocop:disable Migration/AddLimitToStringColumns
       t.text :status_reason
     end
 

db/migrate/20180216120000_add_pages_domain_verification.rb

@@ -3,6 +3,6 @@ class AddPagesDomainVerification < ActiveRecord::Migration[4.2]
 
   def change
     add_column :pages_domains, :verified_at, :datetime_with_timezone
-    add_column :pages_domains, :verification_code, :string
+    add_column :pages_domains, :verification_code, :string # rubocop:disable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20180222043024_add_ip_address_to_runner.rb

@@ -4,6 +4,6 @@ class AddIpAddressToRunner < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
-    add_column :ci_runners, :ip_address, :string
+    add_column :ci_runners, :ip_address, :string # rubocop:disable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20180308125206_add_user_internal_regex_to_application_setting.rb

@@ -4,7 +4,7 @@ class AddUserInternalRegexToApplicationSetting < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def up
-    add_column :application_settings, :user_default_internal_regex, :string, null: true
+    add_column :application_settings, :user_default_internal_regex, :string, null: true # rubocop:disable Migration/AddLimitToStringColumns
   end
 
   def down

db/migrate/20180315160435_add_external_auth_mutual_tls_fields_to_project_settings.rb

@@ -2,6 +2,7 @@ class AddExternalAuthMutualTlsFieldsToProjectSettings < ActiveRecord::Migration[
   DOWNTIME = false
 
   def change
+    # rubocop:disable Migration/AddLimitToStringColumns
     add_column :application_settings,
                :external_auth_client_cert, :text
     add_column :application_settings,
@@ -12,5 +13,6 @@ class AddExternalAuthMutualTlsFieldsToProjectSettings < ActiveRecord::Migration[
                :encrypted_external_auth_client_key_pass, :string
     add_column :application_settings,
                :encrypted_external_auth_client_key_pass_iv, :string
+    # rubocop:enable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20180319190020_create_deploy_tokens.rb

@@ -2,6 +2,7 @@ class CreateDeployTokens < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
+    # rubocop:disable Migration/AddLimitToStringColumns
     create_table :deploy_tokens do |t|
       t.boolean :revoked, default: false
       t.boolean :read_repository, null: false, default: false
@@ -15,5 +16,6 @@ class CreateDeployTokens < ActiveRecord::Migration[4.2]
 
       t.index [:token, :expires_at, :id], where: "(revoked IS FALSE)"
     end
+    # rubocop:enable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20180502122856_create_project_mirror_data.rb

@@ -3,6 +3,7 @@ class CreateProjectMirrorData < ActiveRecord::Migration[4.2]
 
   DOWNTIME = false
 
+  # rubocop:disable Migration/AddLimitToStringColumns
   def up
     if table_exists?(:project_mirror_data)
       add_column :project_mirror_data, :status, :string unless column_exists?(:project_mirror_data, :status)
@@ -17,6 +18,7 @@ class CreateProjectMirrorData < ActiveRecord::Migration[4.2]
       end
     end
   end
+  # rubocop:enable Migration/AddLimitToStringColumns
 
   def down
     remove_column :project_mirror_data, :status

db/migrate/20180503131624_create_remote_mirrors.rb

@@ -5,6 +5,7 @@ class CreateRemoteMirrors < ActiveRecord::Migration[4.2]
 
   disable_ddl_transaction!
 
+  # rubocop:disable Migration/AddLimitToStringColumns
   def up
     return if table_exists?(:remote_mirrors)
 
@@ -27,6 +28,7 @@ class CreateRemoteMirrors < ActiveRecord::Migration[4.2]
       t.timestamps null: false
     end
   end
+  # rubocop:enable Migration/AddLimitToStringColumns
 
   def down
     # ee/db/migrate/20160321161032_create_remote_mirrors_ee.rb will remove the table

db/migrate/20180503175053_ensure_missing_columns_to_project_mirror_data.rb

@@ -4,8 +4,8 @@ class EnsureMissingColumnsToProjectMirrorData < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def up
-    add_column :project_mirror_data, :status, :string unless column_exists?(:project_mirror_data, :status)
-    add_column :project_mirror_data, :jid, :string unless column_exists?(:project_mirror_data, :jid)
+    add_column :project_mirror_data, :status, :string unless column_exists?(:project_mirror_data, :status) # rubocop:disable Migration/AddLimitToStringColumns
+    add_column :project_mirror_data, :jid, :string unless column_exists?(:project_mirror_data, :jid) # rubocop:disable Migration/AddLimitToStringColumns
     add_column :project_mirror_data, :last_error, :text unless column_exists?(:project_mirror_data, :last_error)
   end
 

db/migrate/20180511131058_create_clusters_applications_jupyter.rb

@@ -7,17 +7,19 @@ class CreateClustersApplicationsJupyter < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
+    # rubocop:disable Migration/AddLimitToStringColumns
     create_table :clusters_applications_jupyter do |t|
       t.references :cluster, null: false, unique: true, foreign_key: { on_delete: :cascade }
       t.references :oauth_application, foreign_key: { on_delete: :nullify }
 
       t.integer :status, null: false
-      t.string :version, null: false
-      t.string :hostname
+      t.string :version, null: false # rubocop:disable Migration/AddLimitToStringColumns
+      t.string :hostname # rubocop:disable Migration/AddLimitToStringColumns
 
       t.timestamps_with_timezone null: false
 
       t.text :status_reason
     end
+    # rubocop:enable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20180515121227_create_notes_diff_files.rb

@@ -4,6 +4,7 @@ class CreateNotesDiffFiles < ActiveRecord::Migration[4.2]
   disable_ddl_transaction!
 
   def change
+    # rubocop:disable Migration/AddLimitToStringColumns
     create_table :note_diff_files do |t|
       t.references :diff_note, references: :notes, null: false, index: { unique: true }
       t.text :diff, null: false
@@ -18,5 +19,6 @@ class CreateNotesDiffFiles < ActiveRecord::Migration[4.2]
 
     # rubocop:disable Migration/AddConcurrentForeignKey
     add_foreign_key :note_diff_files, :notes, column: :diff_note_id, on_delete: :cascade
+    # rubocop:enable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20180529093006_ensure_remote_mirror_columns.rb

@@ -8,7 +8,7 @@ class EnsureRemoteMirrorColumns < ActiveRecord::Migration[4.2]
   def up
     # rubocop:disable Migration/Datetime
     add_column :remote_mirrors, :last_update_started_at, :datetime unless column_exists?(:remote_mirrors, :last_update_started_at)
-    add_column :remote_mirrors, :remote_name, :string unless column_exists?(:remote_mirrors, :remote_name)
+    add_column :remote_mirrors, :remote_name, :string unless column_exists?(:remote_mirrors, :remote_name) # rubocop:disable Migration/AddLimitToStringColumns
 
     unless column_exists?(:remote_mirrors, :only_protected_branches)
       add_column_with_default(:remote_mirrors,

db/migrate/20180531185349_add_repository_languages.rb

@@ -4,6 +4,7 @@ class AddRepositoryLanguages < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def up
+    # rubocop:disable Migration/AddLimitToStringColumns
     create_table(:programming_languages) do |t|
       t.string :name, null: false
       t.string :color, null: false
@@ -19,6 +20,7 @@ class AddRepositoryLanguages < ActiveRecord::Migration[4.2]
     add_index :programming_languages, :name, unique: true
     add_index :repository_languages, [:project_id, :programming_language_id],
       unique: true, name: "index_repository_languages_on_project_and_languages_id"
+    # rubocop:enable Migration/AddLimitToStringColumns
   end
 
   def down

db/migrate/20180613081317_create_ci_builds_runner_session.rb

@@ -8,6 +8,7 @@ class CreateCiBuildsRunnerSession < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
+    # rubocop:disable Migration/AddLimitToStringColumns
     create_table :ci_builds_runner_session, id: :bigserial do |t|
       t.integer :build_id, null: false
       t.string :url, null: false
@@ -17,5 +18,6 @@ class CreateCiBuildsRunnerSession < ActiveRecord::Migration[4.2]
       t.foreign_key :ci_builds, column: :build_id, on_delete: :cascade
       t.index :build_id, unique: true
     end
+    # rubocop:enable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20180713092803_create_user_statuses.rb

@@ -6,6 +6,7 @@ class CreateUserStatuses < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
+    # rubocop:disable Migration/AddLimitToStringColumns
     create_table :user_statuses, id: false, primary_key: :user_id do |t|
       t.references :user,
                    foreign_key: { on_delete: :cascade },
@@ -16,5 +17,6 @@ class CreateUserStatuses < ActiveRecord::Migration[4.2]
       t.string :message, limit: 100
       t.string :message_html
     end
+    # rubocop:enable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20180814153625_add_commit_email_to_users.rb

@@ -28,6 +28,6 @@ class AddCommitEmailToUsers < ActiveRecord::Migration[4.2]
   # disable_ddl_transaction!
 
   def change
-    add_column :users, :commit_email, :string
+    add_column :users, :commit_email, :string # rubocop:disable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20180831164908_add_identifier_to_prometheus_metric.rb

@@ -6,6 +6,6 @@ class AddIdentifierToPrometheusMetric < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
-    add_column :prometheus_metrics, :identifier, :string
+    add_column :prometheus_metrics, :identifier, :string # rubocop:disable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20180910115836_add_attr_encrypted_columns_to_web_hook.rb

@@ -6,10 +6,12 @@ class AddAttrEncryptedColumnsToWebHook < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
+    # rubocop:disable Migration/AddLimitToStringColumns
     add_column :web_hooks, :encrypted_token, :string
     add_column :web_hooks, :encrypted_token_iv, :string
 
     add_column :web_hooks, :encrypted_url, :string
     add_column :web_hooks, :encrypted_url_iv, :string
+    # rubocop:enable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20180910153412_add_token_digest_to_personal_access_tokens.rb

@@ -8,7 +8,7 @@ class AddTokenDigestToPersonalAccessTokens < ActiveRecord::Migration[4.2]
   def up
     change_column :personal_access_tokens, :token, :string, null: true
 
-    add_column :personal_access_tokens, :token_digest, :string
+    add_column :personal_access_tokens, :token_digest, :string # rubocop:disable Migration/AddLimitToStringColumns
   end
 
   def down

db/migrate/20180912111628_add_knative_application.rb

@@ -6,6 +6,7 @@ class AddKnativeApplication < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
+    # rubocop:disable Migration/AddLimitToStringColumns
     create_table "clusters_applications_knative" do |t|
       t.references :cluster, null: false, unique: true, foreign_key: { on_delete: :cascade }
 
@@ -16,5 +17,6 @@ class AddKnativeApplication < ActiveRecord::Migration[4.2]
       t.string "hostname"
       t.text "status_reason"
     end
+    # rubocop:enable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20181009190428_create_clusters_kubernetes_namespaces.rb

@@ -5,6 +5,7 @@ class CreateClustersKubernetesNamespaces < ActiveRecord::Migration[4.2]
   INDEX_NAME = 'kubernetes_namespaces_cluster_and_namespace'
 
   def change
+    # rubocop:disable Migration/AddLimitToStringColumns
     create_table :clusters_kubernetes_namespaces, id: :bigserial do |t|
       t.references :cluster, null: false, index: true, foreign_key: { on_delete: :cascade }
       t.references :project, index: true, foreign_key: { on_delete: :nullify }
@@ -20,5 +21,6 @@ class CreateClustersKubernetesNamespaces < ActiveRecord::Migration[4.2]
 
       t.index [:cluster_id, :namespace], name: INDEX_NAME, unique: true
     end
+    # rubocop:enable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20181019032400_add_shards_table.rb

@@ -5,7 +5,7 @@ class AddShardsTable < ActiveRecord::Migration[4.2]
 
   def change
     create_table :shards do |t|
-      t.string :name, null: false, index: { unique: true }
+      t.string :name, null: false, index: { unique: true } # rubocop:disable Migration/AddLimitToStringColumns
     end
   end
 end

db/migrate/20181019032408_add_repositories_table.rb

@@ -6,7 +6,7 @@ class AddRepositoriesTable < ActiveRecord::Migration[4.2]
   def change
     create_table :repositories, id: :bigserial do |t|
       t.references :shard, null: false, index: true, foreign_key: { on_delete: :restrict }
-      t.string :disk_path, null: false, index: { unique: true }
+      t.string :disk_path, null: false, index: { unique: true } # rubocop:disable Migration/AddLimitToStringColumns
     end
 
     add_column :projects, :pool_repository_id, :bigint

db/migrate/20181025115728_add_private_commit_email_hostname_to_application_settings.rb

@@ -6,6 +6,6 @@ class AddPrivateCommitEmailHostnameToApplicationSettings < ActiveRecord::Migrati
   DOWNTIME = false
 
   def change
-    add_column(:application_settings, :commit_email_hostname, :string, null: true)
+    add_column(:application_settings, :commit_email_hostname, :string, null: true) # rubocop:disable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20181031190559_drop_gcp_clusters_table.rb

@@ -10,6 +10,7 @@ class DropGcpClustersTable < ActiveRecord::Migration[4.2]
   end
 
   def down
+    # rubocop:disable Migration/AddLimitToStringColumns
     create_table :gcp_clusters do |t|
       # Order columns by best align scheme
       t.references :project, null: false, index: { unique: true }, foreign_key: { on_delete: :cascade }
@@ -49,5 +50,6 @@ class DropGcpClustersTable < ActiveRecord::Migration[4.2]
       t.text :encrypted_gcp_token
       t.string :encrypted_gcp_token_iv
     end
+    # rubocop:enable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20181101191341_create_clusters_applications_cert_manager.rb

@@ -6,6 +6,7 @@ class CreateClustersApplicationsCertManager < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
+    # rubocop:disable Migration/AddLimitToStringColumns
     create_table :clusters_applications_cert_managers do |t|
       t.references :cluster, null: false, index: false, foreign_key: { on_delete: :cascade }
       t.integer :status, null: false
@@ -15,5 +16,6 @@ class CreateClustersApplicationsCertManager < ActiveRecord::Migration[4.2]
       t.text :status_reason
       t.index :cluster_id, unique: true
     end
+    # rubocop:enable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20181115140140_add_encrypted_runners_token_to_settings.rb

@@ -6,6 +6,6 @@ class AddEncryptedRunnersTokenToSettings < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
-    add_column :application_settings, :runners_registration_token_encrypted, :string
+    add_column :application_settings, :runners_registration_token_encrypted, :string # rubocop:disable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20181116050532_knative_external_ip.rb

@@ -9,6 +9,6 @@ class KnativeExternalIp < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
-    add_column :clusters_applications_knative, :external_ip, :string
+    add_column :clusters_applications_knative, :external_ip, :string # rubocop:disable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20181116141415_add_encrypted_runners_token_to_namespaces.rb

@@ -6,6 +6,6 @@ class AddEncryptedRunnersTokenToNamespaces < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
-    add_column :namespaces, :runners_token_encrypted, :string
+    add_column :namespaces, :runners_token_encrypted, :string # rubocop:disable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20181116141504_add_encrypted_runners_token_to_projects.rb

@@ -6,6 +6,6 @@ class AddEncryptedRunnersTokenToProjects < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
-    add_column :projects, :runners_token_encrypted, :string
+    add_column :projects, :runners_token_encrypted, :string # rubocop:disable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20181120151656_add_token_encrypted_to_ci_runners.rb

@@ -6,6 +6,6 @@ class AddTokenEncryptedToCiRunners < ActiveRecord::Migration[4.2]
   DOWNTIME = false
 
   def change
-    add_column :ci_runners, :token_encrypted, :string
+    add_column :ci_runners, :token_encrypted, :string # rubocop:disable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20181122160027_create_project_repositories.rb

@@ -11,7 +11,7 @@ class CreateProjectRepositories < ActiveRecord::Migration[5.0]
   def change
     create_table :project_repositories, id: :bigserial do |t|
       t.references :shard, null: false, index: true, foreign_key: { on_delete: :restrict }
-      t.string :disk_path, null: false, index: { unique: true }
+      t.string :disk_path, null: false, index: { unique: true } # rubocop:disable Migration/AddLimitToStringColumns
       t.references :project, null: false, index: { unique: true }, foreign_key: { on_delete: :cascade }
     end
   end

db/migrate/20181123144235_create_suggestions.rb

@@ -8,7 +8,7 @@ class CreateSuggestions < ActiveRecord::Migration[5.0]
       t.references :note, foreign_key: { on_delete: :cascade }, null: false
       t.integer :relative_order, null: false, limit: 2
       t.boolean :applied, null: false, default: false
-      t.string :commit_id
+      t.string :commit_id # rubocop:disable Migration/AddLimitToStringColumns
       t.text :from_content, null: false
       t.text :to_content, null: false
 

db/migrate/20181128123704_add_state_to_pool_repository.rb

@@ -9,7 +9,7 @@ class AddStateToPoolRepository < ActiveRecord::Migration[5.0]
   # the transactions don't have to be disabled
   # rubocop: disable Migration/AddConcurrentForeignKey, Migration/AddIndex
   def change
-    add_column(:pool_repositories, :state, :string, null: true)
+    add_column(:pool_repositories, :state, :string, null: true) # rubocop:disable Migration/AddLimitToStringColumns
 
     add_column :pool_repositories, :source_project_id, :integer
     add_index :pool_repositories, :source_project_id, unique: true

db/migrate/20181129104854_add_token_encrypted_to_ci_builds.rb

@@ -6,6 +6,6 @@ class AddTokenEncryptedToCiBuilds < ActiveRecord::Migration[5.0]
   DOWNTIME = false
 
   def change
-    add_column :ci_builds, :token_encrypted, :string
+    add_column :ci_builds, :token_encrypted, :string # rubocop:disable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20181203002526_add_project_bfg_object_map_column.rb

@@ -4,6 +4,6 @@ class AddProjectBfgObjectMapColumn < ActiveRecord::Migration[5.0]
   DOWNTIME = false
 
   def change
-    add_column :projects, :bfg_object_map, :string
+    add_column :projects, :bfg_object_map, :string # rubocop:disable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20181211092510_add_name_author_id_and_sha_to_releases.rb

@@ -7,7 +7,7 @@ class AddNameAuthorIdAndShaToReleases < ActiveRecord::Migration[5.0]
 
   def change
     add_column :releases, :author_id, :integer
-    add_column :releases, :name, :string
-    add_column :releases, :sha, :string
+    add_column :releases, :name, :string # rubocop:disable Migration/AddLimitToStringColumns
+    add_column :releases, :sha, :string # rubocop:disable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20181212171634_create_error_tracking_settings.rb

@@ -6,6 +6,7 @@ class CreateErrorTrackingSettings < ActiveRecord::Migration[5.0]
   DOWNTIME = false
 
   def change
+    # rubocop:disable Migration/AddLimitToStringColumns
     create_table :project_error_tracking_settings, id: :int, primary_key: :project_id, default: nil do |t|
       t.boolean :enabled, null: false, default: true
       t.string :api_url, null: false
@@ -13,5 +14,6 @@ class CreateErrorTrackingSettings < ActiveRecord::Migration[5.0]
       t.string :encrypted_token_iv
       t.foreign_key :projects, column: :project_id, on_delete: :cascade
     end
+    # rubocop:enable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20181228175414_create_releases_link_table.rb

@@ -6,6 +6,7 @@ class CreateReleasesLinkTable < ActiveRecord::Migration[5.0]
   DOWNTIME = false
 
   def change
+    # rubocop:disable Migration/AddLimitToStringColumns
     create_table :release_links, id: :bigserial do |t|
       t.references :release, null: false, index: false, foreign_key: { on_delete: :cascade }
       t.string :url, null: false
@@ -15,5 +16,6 @@ class CreateReleasesLinkTable < ActiveRecord::Migration[5.0]
       t.index [:release_id, :url], unique: true
       t.index [:release_id, :name], unique: true
     end
+    # rubocop:enable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20190109153125_add_merge_request_external_diffs.rb

@@ -11,7 +11,7 @@ class AddMergeRequestExternalDiffs < ActiveRecord::Migration[5.0]
 
   def change
     # Allow the merge request diff to store details about an external file
-    add_column :merge_request_diffs, :external_diff, :string
+    add_column :merge_request_diffs, :external_diff, :string # rubocop:disable Migration/AddLimitToStringColumns
     add_column :merge_request_diffs, :external_diff_store, :integer
     add_column :merge_request_diffs, :stored_externally, :boolean
 

db/migrate/20190114172110_add_domain_to_cluster.rb

@@ -4,6 +4,6 @@ class AddDomainToCluster < ActiveRecord::Migration[5.0]
   DOWNTIME = false
 
   def change
-    add_column :clusters, :domain, :string
+    add_column :clusters, :domain, :string # rubocop:disable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20190115092821_add_columns_project_error_tracking_settings.rb

@@ -6,8 +6,8 @@ class AddColumnsProjectErrorTrackingSettings < ActiveRecord::Migration[5.0]
   DOWNTIME = false
 
   def change
-    add_column :project_error_tracking_settings, :project_name, :string
-    add_column :project_error_tracking_settings, :organization_name, :string
+    add_column :project_error_tracking_settings, :project_name, :string # rubocop:disable Migration/AddLimitToStringColumns
+    add_column :project_error_tracking_settings, :organization_name, :string # rubocop:disable Migration/AddLimitToStringColumns
 
     change_column_default :project_error_tracking_settings, :enabled, from: true, to: false
 

db/migrate/20190116234221_add_sorting_fields_to_user_preference.rb

@@ -10,8 +10,8 @@ class AddSortingFieldsToUserPreference < ActiveRecord::Migration[5.0]
   DOWNTIME = false
 
   def up
-    add_column :user_preferences, :issues_sort, :string
-    add_column :user_preferences, :merge_requests_sort, :string
+    add_column :user_preferences, :issues_sort, :string # rubocop:disable Migration/AddLimitToStringColumns
+    add_column :user_preferences, :merge_requests_sort, :string # rubocop:disable Migration/AddLimitToStringColumns
   end
 
   def down

db/migrate/20190301182457_add_external_hostname_to_ingress_and_knative.rb

@@ -4,7 +4,7 @@ class AddExternalHostnameToIngressAndKnative < ActiveRecord::Migration[5.0]
   DOWNTIME = false
 
   def change
-    add_column :clusters_applications_ingress, :external_hostname, :string
-    add_column :clusters_applications_knative, :external_hostname, :string
+    add_column :clusters_applications_ingress, :external_hostname, :string # rubocop:disable Migration/AddLimitToStringColumns
+    add_column :clusters_applications_knative, :external_hostname, :string # rubocop:disable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20190320174702_add_lets_encrypt_notification_email_to_application_settings.rb

@@ -10,6 +10,6 @@ class AddLetsEncryptNotificationEmailToApplicationSettings < ActiveRecord::Migra
   DOWNTIME = false
 
   def change
-    add_column :application_settings, :lets_encrypt_notification_email, :string
+    add_column :application_settings, :lets_encrypt_notification_email, :string # rubocop:disable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20190325105715_add_fields_to_user_preferences.rb

@@ -11,7 +11,7 @@ class AddFieldsToUserPreferences < ActiveRecord::Migration[5.0]
   DOWNTIME = false
 
   def up
-    add_column(:user_preferences, :timezone, :string)
+    add_column(:user_preferences, :timezone, :string) # rubocop:disable Migration/AddLimitToStringColumns
     add_column(:user_preferences, :time_display_relative, :boolean)
     add_column(:user_preferences, :time_format_in_24h, :boolean)
   end

db/migrate/20190327163904_add_notification_email_to_notification_settings.rb

@@ -6,6 +6,6 @@ class AddNotificationEmailToNotificationSettings < ActiveRecord::Migration[5.0]
   DOWNTIME = false
 
   def change
-    add_column :notification_settings, :notification_email, :string
+    add_column :notification_settings, :notification_email, :string # rubocop:disable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20190402150158_backport_enterprise_schema.rb

@@ -2,6 +2,7 @@
 
 # rubocop: disable Metrics/AbcSize
 # rubocop: disable Migration/Datetime
+# rubocop: disable Migration/AddLimitToStringColumns
 class BackportEnterpriseSchema < ActiveRecord::Migration[5.0]
   include Gitlab::Database::MigrationHelpers
 
@@ -2190,3 +2191,4 @@ class BackportEnterpriseSchema < ActiveRecord::Migration[5.0]
 end
 # rubocop: enable Metrics/AbcSize
 # rubocop: enable Migration/Datetime
+# rubocop: enable Migration/AddLimitToStringColumns

db/migrate/20190409224933_add_name_to_geo_nodes.rb

@@ -10,7 +10,7 @@ class AddNameToGeoNodes < ActiveRecord::Migration[5.0]
   DOWNTIME = false
 
   def up
-    add_column :geo_nodes, :name, :string
+    add_column :geo_nodes, :name, :string # rubocop:disable Migration/AddLimitToStringColumns
 
     # url is also unique, and its type and size is identical to the name column,
     # so this is safe.

db/migrate/20190422082247_create_project_metrics_settings.rb

@@ -7,7 +7,7 @@ class CreateProjectMetricsSettings < ActiveRecord::Migration[5.0]
 
   def change
     create_table :project_metrics_settings, id: :int, primary_key: :project_id, default: nil do |t|
-      t.string :external_dashboard_url, null: false
+      t.string :external_dashboard_url, null: false # rubocop:disable Migration/AddLimitToStringColumns
       t.foreign_key :projects, column: :project_id, on_delete: :cascade
     end
   end

db/migrate/20190429082448_create_pages_domain_acme_orders.rb

@@ -10,6 +10,7 @@ class CreatePagesDomainAcmeOrders < ActiveRecord::Migration[5.1]
   DOWNTIME = false
 
   def change
+    # rubocop:disable Migration/AddLimitToStringColumns
     create_table :pages_domain_acme_orders do |t|
       t.references :pages_domain, null: false, index: true, foreign_key: { on_delete: :cascade }, type: :integer
 
@@ -24,5 +25,6 @@ class CreatePagesDomainAcmeOrders < ActiveRecord::Migration[5.1]
       t.text :encrypted_private_key, null: false
       t.text :encrypted_private_key_iv, null: false
     end
+    # rubocop:enable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20190430131225_create_issue_tracker_data.rb

@@ -9,6 +9,7 @@ class CreateIssueTrackerData < ActiveRecord::Migration[5.1]
   DOWNTIME = false
 
   def change
+    # rubocop:disable Migration/AddLimitToStringColumns
     create_table :issue_tracker_data do |t|
       t.references :service, foreign_key: { on_delete: :cascade }, type: :integer, index: true, null: false
       t.timestamps_with_timezone
@@ -19,5 +20,6 @@ class CreateIssueTrackerData < ActiveRecord::Migration[5.1]
       t.string :encrypted_new_issue_url
       t.string :encrypted_new_issue_url_iv
     end
+    # rubocop:enable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20190430142025_create_jira_tracker_data.rb

@@ -9,6 +9,7 @@ class CreateJiraTrackerData < ActiveRecord::Migration[5.1]
   DOWNTIME = false
 
   def change
+    # rubocop:disable Migration/AddLimitToStringColumns
     create_table :jira_tracker_data do |t|
       t.references :service, foreign_key: { on_delete: :cascade }, type: :integer, index: true, null: false
       t.timestamps_with_timezone
@@ -22,5 +23,6 @@ class CreateJiraTrackerData < ActiveRecord::Migration[5.1]
       t.string :encrypted_password_iv
       t.string :jira_issue_transition_id
     end
+    # rubocop:enable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20190514105711_create_ip_restriction.rb

@@ -12,7 +12,7 @@ class CreateIpRestriction < ActiveRecord::Migration[5.1]
                    type: :integer,
                    null: false,
                    index: true
-      t.string :range, null: false
+      t.string :range, null: false # rubocop:disable Migration/AddLimitToStringColumns
     end
 
     add_foreign_key(:ip_restrictions, :namespaces, column: :group_id, on_delete: :cascade) # rubocop: disable Migration/AddConcurrentForeignKey

db/migrate/20190527011309_add_required_template_name_to_application_settings.rb

@@ -10,6 +10,6 @@ class AddRequiredTemplateNameToApplicationSettings < ActiveRecord::Migration[5.1
   DOWNTIME = false
 
   def change
-    add_column :application_settings, :required_instance_ci_template, :string, null: true
+    add_column :application_settings, :required_instance_ci_template, :string, null: true # rubocop:disable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20190606054742_add_token_encrypted_to_operations_feature_flags_clients.rb

@@ -6,6 +6,6 @@ class AddTokenEncryptedToOperationsFeatureFlagsClients < ActiveRecord::Migration
   DOWNTIME = false
 
   def change
-    add_column :operations_feature_flags_clients, :token_encrypted, :string
+    add_column :operations_feature_flags_clients, :token_encrypted, :string # rubocop:disable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20190613044655_add_username_to_deploy_tokens.rb

@@ -4,6 +4,6 @@ class AddUsernameToDeployTokens < ActiveRecord::Migration[5.1]
   DOWNTIME = false
 
   def change
-    add_column :deploy_tokens, :username, :string
+    add_column :deploy_tokens, :username, :string # rubocop:disable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20190613073003_create_project_aliases.rb

@@ -8,7 +8,7 @@ class CreateProjectAliases < ActiveRecord::Migration[5.1]
   def change
     create_table :project_aliases do |t|
       t.references :project, null: false, index: true, foreign_key: { on_delete: :cascade }, type: :integer
-      t.string :name, null: false, index: { unique: true }
+      t.string :name, null: false, index: { unique: true } # rubocop:disable Migration/AddLimitToStringColumns
 
       t.timestamps_with_timezone null: false
     end

db/migrate/20190621151636_add_merge_request_rebase_jid.rb

@@ -4,6 +4,6 @@ class AddMergeRequestRebaseJid < ActiveRecord::Migration[5.1]
   DOWNTIME = false
 
   def change
-    add_column :merge_requests, :rebase_jid, :string
+    add_column :merge_requests, :rebase_jid, :string # rubocop:disable Migration/AddLimitToStringColumns
   end
 end

db/migrate/20190624123615_add_grafana_url_to_settings.rb

@@ -8,8 +8,10 @@ class AddGrafanaUrlToSettings < ActiveRecord::Migration[5.1]
   DOWNTIME = false
 
   def up
+    # rubocop:disable Migration/AddLimitToStringColumns
     add_column_with_default(:application_settings, :grafana_url, :string,
                             default: '/-/grafana', allow_null: false)
+    # rubocop:enable Migration/AddLimitToStringColumns
   end
 
   def down

db/migrate/20190711124721_create_job_variables.rb

@@ -10,6 +10,7 @@ class CreateJobVariables < ActiveRecord::Migration[5.1]
   DOWNTIME = false
 
   def change
+    # rubocop:disable Migration/AddLimitToStringColumns
     create_table :ci_job_variables do |t|
       t.string :key, null: false
       t.text :encrypted_value
@@ -17,6 +18,7 @@ class CreateJobVariables < ActiveRecord::Migration[5.1]
       t.references :job, null: false, index: true, foreign_key: { to_table: :ci_builds, on_delete: :cascade }
       t.integer :variable_type, null: false, limit: 2, default: 1
     end
+    # rubocop:enable Migration/AddLimitToStringColumns
 
     add_index :ci_job_variables, [:key, :job_id], unique: true
   end

db/post_migrate/20181013005024_remove_koding_from_application_settings.rb

@@ -12,6 +12,6 @@ class RemoveKodingFromApplicationSettings < ActiveRecord::Migration[4.2]
 
   def down
     add_column :application_settings, :koding_enabled, :boolean # rubocop:disable Migration/SaferBooleanColumn
-    add_column :application_settings, :koding_url, :string
+    add_column :application_settings, :koding_url, :string # rubocop:disable Migration/AddLimitToStringColumns
   end
 end

db/post_migrate/20190404231137_remove_alternate_url_from_geo_nodes.rb

@@ -16,6 +16,6 @@ class RemoveAlternateUrlFromGeoNodes < ActiveRecord::Migration[5.0]
   end
 
   def down
-    add_column :geo_nodes, :alternate_url, :string
+    add_column :geo_nodes, :alternate_url, :string # rubocop:disable Migration/AddLimitToStringColumns
   end
 end

db/post_migrate/20190625184066_remove_sentry_from_application_settings.rb

@@ -32,7 +32,7 @@ class RemoveSentryFromApplicationSettings < ActiveRecord::Migration[5.0]
     end
 
     SENTRY_DSN_COLUMNS.each do |column|
-      add_column(:application_settings, column, :string) unless column_exists?(:application_settings, column)
+      add_column(:application_settings, column, :string) unless column_exists?(:application_settings, column) # rubocop:disable Migration/AddLimitToStringColumns
     end
   end
 end

rubocop/cop/migration/add_limit_to_string_columns.rb

+# frozen_string_literal: true
+
+require_relative '../../migration_helpers'
+
+module RuboCop
+  module Cop
+    module Migration
+      # Cop that enforces length constraints to string columns
+      class AddLimitToStringColumns < RuboCop::Cop::Cop
+        include MigrationHelpers
+
+        ADD_COLUMNS_METHODS = %i(add_column add_column_with_default).freeze
+
+        MSG = 'String columns should have a limit constraint. 255 is suggested'.freeze
+
+        def on_def(node)
+          return unless in_migration?(node)
+
+          node.each_descendant(:send) do |send_node|
+            next unless string_operation?(send_node)
+
+            add_offense(send_node, location: :selector) unless limit_on_string_column?(send_node)
+          end
+        end
+
+        private
+
+        def string_operation?(node)
+          modifier = node.children[0]
+          migration_method = node.children[1]
+
+          if migration_method == :string
+            modifier.type == :lvar
+          elsif ADD_COLUMNS_METHODS.include?(migration_method)
+            modifier.nil? && string_column?(node.children[4])
+          end
+        end
+
+        def string_column?(column_type)
+          column_type.type == :sym && column_type.value == :string
+        end
+
+        def limit_on_string_column?(node)
+          migration_method = node.children[1]
+
+          if migration_method == :string
+            limit_present?(node.children)
+          elsif ADD_COLUMNS_METHODS.include?(migration_method)
+            limit_present?(node)
+          end
+        end
+
+        def limit_present?(statement)
+          !(statement.to_s =~ /:limit/).nil?
+        end
+      end
+    end
+  end
+end

rubocop/rubocop.rb

@@ -17,6 +17,7 @@ require_relative 'cop/migration/add_column'
 require_relative 'cop/migration/add_concurrent_foreign_key'
 require_relative 'cop/migration/add_concurrent_index'
 require_relative 'cop/migration/add_index'
+require_relative 'cop/migration/add_limit_to_string_columns'
 require_relative 'cop/migration/add_reference'
 require_relative 'cop/migration/add_timestamps'
 require_relative 'cop/migration/datetime'

spec/rubocop/cop/migration/add_limit_to_string_columns_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+require 'rubocop'
+require 'rubocop/rspec/support'
+
+require_relative '../../../../rubocop/cop/migration/add_limit_to_string_columns'
+
+describe RuboCop::Cop::Migration::AddLimitToStringColumns do
+  include CopHelper
+
+  subject(:cop) { described_class.new }
+
+  context 'in migration' do
+    before do
+      allow(cop).to receive(:in_migration?).and_return(true)
+
+      inspect_source(migration)
+    end
+
+    context 'when creating a table' do
+      context 'with string columns and limit' do
+        let(:migration) do
+          %q(
+           class CreateUsers < ActiveRecord::Migration[5.2]
+             DOWNTIME = false
+
+             def change
+               create_table :users do |t|
+                 t.string :username, null: false, limit: 255
+                 t.timestamps_with_timezone null: true
+               end
+             end
+           end
+          )
+        end
+
+        it 'register no offense' do
+          expect(cop.offenses.size).to eq(0)
+        end
+
+        context 'with limit in a different position' do
+          let(:migration) do
+            %q(
+             class CreateUsers < ActiveRecord::Migration[5.2]
+               DOWNTIME = false
+
+               def change
+                 create_table :users do |t|
+                   t.string :username, limit: 255, null: false
+                   t.timestamps_with_timezone null: true
+                 end
+               end
+             end
+            )
+          end
+
+          it 'registers an offense' do
+            expect(cop.offenses.size).to eq(0)
+          end
+        end
+      end
+
+      context 'with string columns and no limit' do
+        let(:migration) do
+          %q(
+           class CreateUsers < ActiveRecord::Migration[5.2]
+             DOWNTIME = false
+
+             def change
+               create_table :users do |t|
+                 t.string :username, null: false
+                 t.timestamps_with_timezone null: true
+               end
+             end
+           end
+          )
+        end
+
+        it 'registers an offense' do
+          expect(cop.offenses.size).to eq(1)
+          expect(cop.offenses.first.message)
+            .to eq('String columns should have a limit constraint. 255 is suggested')
+        end
+      end
+
+      context 'with no string columns' do
+        let(:migration) do
+          %q(
+            class CreateMilestoneReleases < ActiveRecord::Migration[5.2]
+              DOWNTIME = false
+
+              def change
+                create_table :milestone_releases do |t|
+                  t.integer :milestone_id
+                  t.integer :release_id
+                end
+              end
+            end
+          )
+        end
+
+        it 'register no offense' do
+          expect(cop.offenses.size).to eq(0)
+        end
+      end
+    end
+
+    context 'when adding columns' do
+      context 'with string columns with limit' do
+        let(:migration) do
+          %q(
+            class AddEmailToUsers < ActiveRecord::Migration[5.2]
+              DOWNTIME = false
+
+              def change
+                add_column :users, :email, :string, limit: 255
+              end
+            end
+          )
+        end
+
+        it 'registers no offense' do
+          expect(cop.offenses.size).to eq(0)
+        end
+
+        context 'with limit in a different position' do
+          let(:migration) do
+            %q(
+              class AddEmailToUsers < ActiveRecord::Migration[5.2]
+                DOWNTIME = false
+
+                def change
+                  add_column :users, :email, :string, limit: 255, default: 'example@email.com'
+                end
+              end
+            )
+          end
+
+          it 'registers no offense' do
+            expect(cop.offenses.size).to eq(0)
+          end
+        end
+      end
+
+      context 'with string columns with no limit' do
+        let(:migration) do
+          %q(
+            class AddEmailToUsers < ActiveRecord::Migration[5.2]
+              DOWNTIME = false
+
+              def change
+                add_column :users, :email, :string
+              end
+            end
+          )
+        end
+
+        it 'registers offense' do
+          expect(cop.offenses.size).to eq(1)
+          expect(cop.offenses.first.message)
+            .to eq('String columns should have a limit constraint. 255 is suggested')
+        end
+      end
+
+      context 'with no string columns' do
+        let(:migration) do
+          %q(
+            class AddEmailToUsers < ActiveRecord::Migration[5.2]
+              DOWNTIME = false
+
+              def change
+                add_column :users, :active, :boolean, default: false
+              end
+            end
+          )
+        end
+
+        it 'registers no offense' do
+          expect(cop.offenses.size).to eq(0)
+        end
+      end
+    end
+
+    context 'with add_column_with_default' do
+      context 'with a limit' do
+        let(:migration) do
+          %q(
+           class AddRuleTypeToApprovalMergeRequestRules < ActiveRecord::Migration[5.2]
+             DOWNTIME = false
+
+             def change
+               add_column_with_default(:approval_merge_request_rules, :rule_type, :string, limit: 2, default: 1)
+             end
+           end
+           )
+        end
+
+        it 'registers no offense' do
+          expect(cop.offenses.size).to eq(0)
+        end
+      end
+
+      context 'without a limit' do
+        let(:migration) do
+          %q(
+           class AddRuleTypeToApprovalMergeRequestRules < ActiveRecord::Migration[5.2]
+             DOWNTIME = false
+
+             def change
+               add_column_with_default(:approval_merge_request_rules, :rule_type, :string, default: 1)
+             end
+           end
+           )
+        end
+
+        it 'registers an offense' do
+          expect(cop.offenses.size).to eq(1)
+        end
+      end
+    end
+
+    context 'with methods' do
+      let(:migration) do
+        %q(
+          class AddEmailToUsers < ActiveRecord::Migration[5.2]
+            DOWNTIME = false
+
+            def change
+              add_column_if_table_not_exists :users, :first_name, :string, limit: 255
+              search_namespace(user_name)
+            end
+
+            def add_column_if_not_exists(table, name, *args)
+              add_column(table, name, *args) unless column_exists?(table, name)
+            end
+
+            def search_namespace(username)
+               Uniquify.new.string(username) do |str|
+                query = "SELECT id FROM namespaces WHERE parent_id IS NULL AND path='#{str}' LIMIT 1"
+                connection.exec_query(query)
+              end
+            end
+          end
+        )
+      end
+
+      it 'registers no offense' do
+        expect(cop.offenses.size).to eq(0)
+      end
+    end
+  end
+
+  context 'outside of migrations' do
+    let(:active_record_model) do
+      %q(
+      class User < ApplicationRecord
+      end
+      )
+    end
+
+    it 'registers no offense' do
+      inspect_source(active_record_model)
+
+      expect(cop.offenses.size).to eq(0)
+    end
+  end
+end