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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 PrepareEventsTableForPushEventsMigration < ActiveRecord::Migration[4.2]
include Gitlab::Database::MigrationHelpers
# Set this constant to true if this migration requires downtime.
DOWNTIME = false
disable_ddl_transaction!
def up
# The order of these columns is deliberate and results in the following
# columns and sizes:
#
# * id (4 bytes)
# * project_id (4 bytes)
# * author_id (4 bytes)
# * target_id (4 bytes)
# * created_at (8 bytes)
# * updated_at (8 bytes)
# * action (2 bytes)
# * target_type (variable)
#
# Unfortunately we can't make the "id" column a bigint/bigserial as Rails 4
# does not support this properly.
create_table :events_for_migration do |t|
t.references :project,
index: true,
foreign_key: { on_delete: :cascade }
t.integer :author_id, index: true, null: false
t.integer :target_id
t.timestamps_with_timezone null: false
t.integer :action, null: false, limit: 2, index: true
t.string :target_type
t.index %i[target_type target_id]
end
# t.references doesn't like it when the column name doesn't make the table
# name so we have to add the foreign key separately.
add_concurrent_foreign_key(:events_for_migration, :users, column: :author_id)
end
def down
drop_table :events_for_migration
end
end
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