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12 lines
597 B
Ruby
12 lines
597 B
Ruby
class FixCategoriesConstraint < ActiveRecord::Migration[4.2]
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def change
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remove_index :categories, name: 'index_categories_on_parent_category_id_and_name'
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# Remove any previous duplicates
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execute "DELETE FROM categories WHERE id IN (SELECT id FROM (SELECT id, row_number() over (partition BY parent_category_id, name ORDER BY id) AS rnum FROM categories) t WHERE t.rnum > 1)"
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# Create a proper index for two categories not to have the same parent
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execute "CREATE UNIQUE INDEX unique_index_categories_on_name ON categories (COALESCE(parent_category_id, -1), name)"
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end
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end
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