Created
July 5, 2013 16:11
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Un ejemplo de uso de UNION para probar
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| module ActiveRecord::UnionScope | |
| def self.included(base) | |
| base.send :extend, ClassMethods | |
| end | |
| module ClassMethods | |
| def union_scope(*scopes) | |
| id_column = "#{table_name}.id" | |
| sub_query = scopes.map { |s| s.select(id_column).to_sql }.join(" UNION ") | |
| where "#{id_column} IN (#{sub_query})" | |
| end | |
| end | |
| end |
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