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1 | class AddUniqueIndexOnMembers < ActiveRecord::Migration | |
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2 | def self.up | |
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3 | # Reassign MemberRole rows if needed | |
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4 | MemberRole.update_all("member_id =" + | |
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5 | " (SELECT min(m2.id) FROM #{Member.table_name} m1, #{Member.table_name} m2" + | |
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6 | " WHERE m1.user_id = m2.user_id AND m1.project_id = m2.project_id" + | |
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7 | " AND m1.id = #{MemberRole.table_name}.member_id)") | |
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8 | # Remove duplicates | |
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9 | Member.connection.select_values("SELECT m.id FROM #{Member.table_name} m" + | |
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10 | " WHERE m.id > (SELECT min(m1.id) FROM #{Member.table_name} m1 WHERE m1.user_id = m.user_id AND m1.project_id = m.project_id)").each do |i| | |
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11 | Member.delete_all(["id = ?", i]) | |
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12 | end | |
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13 | ||
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14 | # Then add a unique index | |
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15 | add_index :members, [:user_id, :project_id], :unique => true | |
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16 | end | |
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17 | ||
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18 | def self.down | |
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19 | end | |
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20 | end | |
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