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