梁2合并条件模型

Question

范围，我有两个范围

named_scope :by_foo, lambda { |foo| { :conditions => {:foo => foo} } } 
named_scope :by_bar, lambda { |bar| { :conditions => ["bar like ?", bar+"%"] } } 

我怎么能在一起在一个范围内，而不链混？

named_scope :by_baz # what that should look like ? 

Answer 1

named_scope :by_baz, lambda {|args| by_foo(args[:foo]).by_bar(args[:bar])}

您可以通过调用它：

Model.by_baz({:foo=>value, :bar=>value})

这样，只要你喜欢，不重写条件，你可以添加尽可能多的范围。

Answer 2

named_scope :by_foo_and_bar, lambda { |foo, bar| { :conditions => ["foo = ? AND bar like ?", foo, bar+"%"] } }