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17 lines
491 B
Ruby
17 lines
491 B
Ruby
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# frozen_string_literal: true
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class AddUniqueIndexOnUserProjects < ActiveRecord::Migration[5.1]
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def up
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# firstly delete the duplicates
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execute 'WITH uniq AS
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(SELECT DISTINCT ON (user_id, project_id) * FROM user_projects)
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DELETE FROM user_projects WHERE user_projects.id NOT IN
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(SELECT id FROM uniq)'
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add_index :user_projects, %i(user_id project_id), unique: true
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end
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def down
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remove_index :user_projects, columns: %i(user_id project_id)
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end
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end
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