Revert column name change

app/models/ci/pipeline.rb

@@ -14,7 +14,7 @@ module Ci
     belongs_to :auto_canceled_by, class_name: 'Ci::Pipeline'
     belongs_to :pipeline_schedule, class_name: 'Ci::PipelineSchedule'
 
-    has_internal_id :iid_per_project, scope: :project, init: ->(s) { s&.project&.pipelines.count }
+    has_internal_id :iid, scope: :project, init: ->(s) { s&.project&.pipelines.count }
 
     has_many :stages
     has_many :statuses, class_name: 'CommitStatus', foreign_key: :commit_id, inverse_of: :pipeline
@@ -492,7 +492,7 @@ module Ci
     def predefined_variables
       Gitlab::Ci::Variables::Collection.new
         .append(key: 'CI_PIPELINE_ID', value: id.to_s)
-        .append(key: 'CI_PIPELINE_IID_PER_PROJECT', value: iid_per_project.to_s)
+        .append(key: 'CI_PIPELINE_IID_PER_PROJECT', value: iid.to_s)
         .append(key: 'CI_CONFIG_PATH', value: ci_yaml_file_path)
         .append(key: 'CI_PIPELINE_SOURCE', value: source.to_s)
     end

db/migrate/20180424160449_add_pipeline_iid_to_ci_pipelines.rb

@@ -6,10 +6,10 @@ class AddPipelineIidToCiPipelines < ActiveRecord::Migration
   disable_ddl_transaction!
 
   def up
-    add_column :ci_pipelines, :iid_per_project, :integer
+    add_column :ci_pipelines, :iid, :integer
   end
 
   def down
-    remove_column :ci_pipelines, :iid_per_project, :integer
+    remove_column :ci_pipelines, :iid, :integer
   end
 end

db/migrate/20180425205249_add_index_constraints_to_pipeline_iid.rb

@@ -6,10 +6,10 @@ class AddIndexConstraintsToPipelineIid < ActiveRecord::Migration
   disable_ddl_transaction!
 
   def up
-    add_concurrent_index :ci_pipelines, [:project_id, :iid_per_project], unique: true, where: 'iid_per_project IS NOT NULL'
+    add_concurrent_index :ci_pipelines, [:project_id, :iid], unique: true, where: 'iid IS NOT NULL'
   end
 
   def down
-    remove_concurrent_index :ci_pipelines, [:project_id, :iid_per_project]
+    remove_concurrent_index :ci_pipelines, [:project_id, :iid]
   end
 end

db/schema.rb

@@ -434,12 +434,12 @@ ActiveRecord::Schema.define(version: 20180425205249) do
     t.integer "config_source"
     t.boolean "protected"
     t.integer "failure_reason"
-    t.integer "iid_per_project"
+    t.integer "iid"
   end
 
   add_index "ci_pipelines", ["auto_canceled_by_id"], name: "index_ci_pipelines_on_auto_canceled_by_id", using: :btree
   add_index "ci_pipelines", ["pipeline_schedule_id"], name: "index_ci_pipelines_on_pipeline_schedule_id", using: :btree
-  add_index "ci_pipelines", ["project_id", "iid_per_project"], name: "index_ci_pipelines_on_project_id_and_iid_per_project", unique: true, where: "(iid_per_project IS NOT NULL)", using: :btree
+  add_index "ci_pipelines", ["project_id", "iid"], name: "index_ci_pipelines_on_project_id_and_iid", unique: true, where: "(iid IS NOT NULL)", using: :btree
   add_index "ci_pipelines", ["project_id", "ref", "status", "id"], name: "index_ci_pipelines_on_project_id_and_ref_and_status_and_id", using: :btree
   add_index "ci_pipelines", ["project_id", "sha"], name: "index_ci_pipelines_on_project_id_and_sha", using: :btree
   add_index "ci_pipelines", ["project_id"], name: "index_ci_pipelines_on_project_id", using: :btree