gitlab-org--gitlab-foss/db/migrate/20201110221400_create_experiment_subjects.rb

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# frozen_string_literal: true
class CreateExperimentSubjects < ActiveRecord::Migration[6.0]
DOWNTIME = false
def up
create_table :experiment_subjects do |t|
t.references :experiment, index: true, foreign_key: { on_delete: :cascade }, null: false
t.bigint :user_id, index: true
t.bigint :group_id, index: true
t.bigint :project_id, index: true
t.integer :variant, limit: 2, null: false, default: 0
t.timestamps_with_timezone null: false
end
# Require exactly one of user_id, group_id, or project_id to be NOT NULL
execute <<-SQL
ALTER TABLE experiment_subjects ADD CONSTRAINT chk_has_one_subject CHECK (num_nonnulls(user_id, group_id, project_id) = 1);
SQL
end
def down
drop_table :experiment_subjects
end
end