Fix migrations

db/post_migrate/20170913150359_change_project_id_to_not_null_in_project_features.rb

-class ChangeProjectIdToNotNullInProjectFeatures < ActiveRecord::Migration
-  DOWNTIME = false
-
-  def up
-    # Deletes corrupted project features
-    delete_project_features_sql = "DELETE FROM project_features WHERE project_id IS NULL"
-    execute(delete_project_features_sql)
-
-    change_column_null :project_features, :project_id, false
-  end
-
-  def down
-    change_column_null :project_features, :project_id, true
-  end
-end

db/post_migrate/20170913180600_fix_projects_without_project_feature.rb

@@ -2,6 +2,10 @@ class FixProjectsWithoutProjectFeature < ActiveRecord::Migration
   DOWNTIME = false
 
   def up
+    # Deletes corrupted project features
+    sql = "DELETE FROM project_features WHERE project_id IS NULL"
+    execute(sql)
+
     # Creates missing project features with private visibility
     sql =
       %Q{
@@ -16,7 +20,7 @@ class FixProjectsWithoutProjectFeature < ActiveRecord::Migration
           10 as snippets_access_level,
           projects.created_at,
           projects.updated_at
-          FROM "projects"
+          FROM projects
           LEFT OUTER JOIN project_features ON project_features.project_id = projects.id
           WHERE (project_features.id IS NULL)
       }

db/schema.rb

@@ -1113,7 +1113,7 @@ ActiveRecord::Schema.define(version: 20170913180600) do
   add_index "project_authorizations", ["user_id", "project_id", "access_level"], name: "index_project_authorizations_on_user_id_project_id_access_level", unique: true, using: :btree
 
   create_table "project_features", force: :cascade do |t|
-    t.integer "project_id", null: false
+    t.integer "project_id"
     t.integer "merge_requests_access_level"
     t.integer "issues_access_level"
     t.integer "wiki_access_level"