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Unions multiple scopes on a model, and returns an instance of ActiveRecord::Relation.
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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}.#{primary_key}" | |
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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