removes redundant code from database.rb

changelogs/unreleased/29056-backport-ee-cleanup-database-file.yml

+---
+title: Turns true value and false value database methods from instance to class methods
+merge_request: 10583
+author:

db/migrate/20130218141258_convert_closed_to_state_in_issue.rb

 # rubocop:disable all
 class ConvertClosedToStateInIssue < ActiveRecord::Migration
-  include Gitlab::Database
+  include Gitlab::Database::MigrationHelpers
 
   def up
     execute "UPDATE #{table_name} SET state = 'closed' WHERE closed = #{true_value}"

db/migrate/20130218141327_convert_closed_to_state_in_merge_request.rb

 # rubocop:disable all
 class ConvertClosedToStateInMergeRequest < ActiveRecord::Migration
-  include Gitlab::Database
+  include Gitlab::Database::MigrationHelpers
 
   def up
     execute "UPDATE #{table_name} SET state = 'merged' WHERE closed = #{true_value} AND merged = #{true_value}"

db/migrate/20130218141344_convert_closed_to_state_in_milestone.rb

 # rubocop:disable all
 class ConvertClosedToStateInMilestone < ActiveRecord::Migration
-  include Gitlab::Database
+  include Gitlab::Database::MigrationHelpers
 
   def up
     execute "UPDATE #{table_name} SET state = 'closed' WHERE closed = #{true_value}"

db/migrate/20130315124931_user_color_scheme.rb

 # rubocop:disable all
 class UserColorScheme < ActiveRecord::Migration
-  include Gitlab::Database
+  include Gitlab::Database::MigrationHelpers
 
   def up
     add_column :users, :color_scheme_id, :integer, null: false, default: 1

db/migrate/20131112220935_add_visibility_level_to_projects.rb

 # rubocop:disable all
 class AddVisibilityLevelToProjects < ActiveRecord::Migration
-  include Gitlab::Database
+  include Gitlab::Database::MigrationHelpers
 
   def self.up
     add_column :projects, :visibility_level, :integer, :default => 0, :null => false

db/migrate/20140313092127_migrate_already_imported_projects.rb

 # rubocop:disable all
 class MigrateAlreadyImportedProjects < ActiveRecord::Migration
-  include Gitlab::Database
+  include Gitlab::Database::MigrationHelpers
 
   def up
     execute("UPDATE projects SET import_status = 'finished' WHERE imported = #{true_value}")

db/migrate/20141007100818_add_visibility_level_to_snippet.rb

 # rubocop:disable all
 class AddVisibilityLevelToSnippet < ActiveRecord::Migration
-  include Gitlab::Database
+  include Gitlab::Database::MigrationHelpers
 
   def up
     add_column :snippets, :visibility_level, :integer, :default => 0, :null => false

db/migrate/20151209144329_migrate_ci_web_hooks.rb

 # rubocop:disable all
 class MigrateCiWebHooks < ActiveRecord::Migration
-  include Gitlab::Database
+  include Gitlab::Database::MigrationHelpers
 
   def up
     execute(

db/migrate/20151209145909_migrate_ci_emails.rb

 # rubocop:disable all
 class MigrateCiEmails < ActiveRecord::Migration
-  include Gitlab::Database
+  include Gitlab::Database::MigrationHelpers
 
   def up
     # This inserts a new service: BuildsEmailService

db/migrate/20151210125232_migrate_ci_slack_service.rb

 # rubocop:disable all
 class MigrateCiSlackService < ActiveRecord::Migration
-  include Gitlab::Database
+  include Gitlab::Database::MigrationHelpers
 
   def up
     properties_query = 'SELECT properties FROM ci_services ' \

db/migrate/20151210125927_migrate_ci_hip_chat_service.rb

 # rubocop:disable all
 class MigrateCiHipChatService < ActiveRecord::Migration
-  include Gitlab::Database
+  include Gitlab::Database::MigrationHelpers
 
   def up
     # From properties strip `hipchat_` key

db/post_migrate/20170301205640_migrate_build_events_to_pipeline_events.rb

 class MigrateBuildEventsToPipelineEvents < ActiveRecord::Migration
   include Gitlab::Database::MigrationHelpers
-  include Gitlab::Database
 
   DOWNTIME = false
 

lib/gitlab/database.rb

@@ -57,16 +57,16 @@ module Gitlab
       postgresql? ? "RANDOM()" : "RAND()"
     end
 
-    def true_value
-      if Gitlab::Database.postgresql?
+    def self.true_value
+      if postgresql?
         "'t'"
       else
         1
       end
     end
 
-    def false_value
-      if Gitlab::Database.postgresql?
+    def self.false_value
+      if postgresql?
         "'f'"
       else
         0

lib/gitlab/database/migration_helpers.rb

@@ -114,6 +114,14 @@ module Gitlab
         execute('SET statement_timeout TO 0') if Database.postgresql?
       end
 
+      def true_value
+        Database.true_value
+      end
+
+      def false_value
+        Database.false_value
+      end
+
       # Updates the value of a column in batches.
       #
       # This method updates the table in batches of 5% of the total row count.

spec/lib/gitlab/database/migration_helpers_spec.rb

@@ -175,6 +175,50 @@ describe Gitlab::Database::MigrationHelpers, lib: true do
     end
   end
 
+  describe '#true_value' do
+    context 'using PostgreSQL' do
+      before do
+        expect(Gitlab::Database).to receive(:postgresql?).and_return(true)
+      end
+
+      it 'returns the appropriate value' do
+        expect(model.true_value).to eq("'t'")
+      end
+    end
+
+    context 'using MySQL' do
+      before do
+        expect(Gitlab::Database).to receive(:postgresql?).and_return(false)
+      end
+
+      it 'returns the appropriate value' do
+        expect(model.true_value).to eq(1)
+      end
+    end
+  end
+
+  describe '#false_value' do
+    context 'using PostgreSQL' do
+      before do
+        expect(Gitlab::Database).to receive(:postgresql?).and_return(true)
+      end
+
+      it 'returns the appropriate value' do
+        expect(model.false_value).to eq("'f'")
+      end
+    end
+
+    context 'using MySQL' do
+      before do
+        expect(Gitlab::Database).to receive(:postgresql?).and_return(false)
+      end
+
+      it 'returns the appropriate value' do
+        expect(model.false_value).to eq(0)
+      end
+    end
+  end
+
   describe '#update_column_in_batches' do
     before do
       create_list(:empty_project, 5)

spec/lib/gitlab/database_spec.rb

@@ -150,13 +150,13 @@ describe Gitlab::Database, lib: true do
     it 'returns correct value for PostgreSQL' do
       expect(described_class).to receive(:postgresql?).and_return(true)
 
-      expect(MigrationTest.new.true_value).to eq "'t'"
+      expect(described_class.true_value).to eq "'t'"
     end
 
     it 'returns correct value for MySQL' do
       expect(described_class).to receive(:postgresql?).and_return(false)
 
-      expect(MigrationTest.new.true_value).to eq 1
+      expect(described_class.true_value).to eq 1
     end
   end
 
@@ -164,13 +164,13 @@ describe Gitlab::Database, lib: true do
     it 'returns correct value for PostgreSQL' do
       expect(described_class).to receive(:postgresql?).and_return(true)
 
-      expect(MigrationTest.new.false_value).to eq "'f'"
+      expect(described_class.false_value).to eq "'f'"
     end
 
     it 'returns correct value for MySQL' do
       expect(described_class).to receive(:postgresql?).and_return(false)
 
-      expect(MigrationTest.new.false_value).to eq 0
+      expect(described_class.false_value).to eq 0
     end
   end
 end