20130201184705_add_unique_index_on_tokens_value.rb
15 lines
| 512 B
| text/x-ruby
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RubyLexer
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r11065 | class AddUniqueIndexOnTokensValue < ActiveRecord::Migration | ||
def up | ||||
say_with_time "Adding unique index on tokens, this may take some time..." do | ||||
# Just in case | ||||
duplicates = Token.connection.select_values("SELECT value FROM #{Token.table_name} GROUP BY value HAVING COUNT(id) > 1") | ||||
Token.where(:value => duplicates).delete_all | ||||
add_index :tokens, :value, :unique => true, :name => 'tokens_value' | ||||
end | ||||
end | ||||
def down | ||||
remove_index :tokens, :name => 'tokens_value' | ||||
end | ||||
end | ||||