1 files changed, 40 insertions, 0 deletions
diff --git a/db/migrate/20170320171632_create_issue_assignees_table.rb b/db/migrate/20170320171632_create_issue_assignees_table.rb
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+++ b/db/migrate/20170320171632_create_issue_assignees_table.rb
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+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class CreateIssueAssigneesTable < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  INDEX_NAME = 'index_issue_assignees_on_issue_id_and_user_id'
+
+  # Set this constant to true if this migration requires downtime.
+  DOWNTIME = false
+
+  # When a migration requires downtime you **must** uncomment the following
+  # constant and define a short and easy to understand explanation as to why the
+  # migration requires downtime.
+  # DOWNTIME_REASON = ''
+
+  # When using the methods "add_concurrent_index" or "add_column_with_default"
+  # you must disable the use of transactions as these methods can not run in an
+  # existing transaction. When using "add_concurrent_index" make sure that this
+  # method is the _only_ method called in the migration, any other changes
+  # should go in a separate migration. This ensures that upon failure _only_ the
+  # index creation fails and can be retried or reverted easily.
+  #
+  # To disable transactions uncomment the following line and remove these
+  # comments:
+  # disable_ddl_transaction!
+
+  def up
+    create_table :issue_assignees, id: false do |t|
+      t.references :user, foreign_key: { on_delete: :cascade }, index: true, null: false
+      t.references :issue, foreign_key: { on_delete: :cascade }, null: false
+    end
+
+    add_index :issue_assignees, [:issue_id, :user_id], unique: true, name: INDEX_NAME
+  end
+
+  def down
+    drop_table :issue_assignees
+  end
+end