add_unique_index_in_issue_relations.patch

Etienne Massip, 2011-12-01 20:54

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db/migrate/20111201201315_add_unique_index_to_issue_relations.rb (revision 0)
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class AddUniqueIndexToIssueRelations < ActiveRecord::Migration
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  def self.up
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    # Remove duplicates
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    IssueRelation.connection.select_values("SELECT r.id FROM #{IssueRelation.table_name} r" +
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      " WHERE r.id > (SELECT min(r1.id) FROM #{IssueRelation.table_name} r1 WHERE r1.issue_from_id = r.issue_from_id AND r1.issue_to_id = r.issue_to_id)").each do |i|
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        IssueRelation.delete_all(["id = ?", i])
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    end
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    add_index :issue_relations, [:issue_from_id, :issue_to_id], :unique => true
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  end
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  def self.down
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    remove_index :issue_relations, :column => [:issue_from_id, :issue_to_id]
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  end
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end