Class | Hashie::Clash |
In: |
lib/hashie/clash.rb
|
Parent: | ::Hash |
A Clash is a "Chainable Lazy Hash". Inspired by libraries such as Arel, a Clash allows you to chain together method arguments to build a hash, something that‘s especially useful if you‘re doing something like constructing a complex options hash. Here‘s a basic example:
c = Hashie::Clash.new.conditions(:foo => 'bar').order(:created_at) c # => {:conditions => {:foo => 'bar'}, :order => :created_at}
Clash provides another way to create sub-hashes by using bang notation. You can dive into a sub-hash by providing a key with a bang and dive back out again with the _end! method. Example:
c = Hashie::Clash.new.conditions!.foo('bar').baz(123)._end!.order(:created_at) c # => {:conditions => {:foo => 'bar', :baz => 123}, :order => :created_at}
Because the primary functionality of Clash is to build options objects, all keys are converted to symbols since many libraries expect symbols explicitly for keys.
Jump back up a level if you are using bang method chaining. For example:
c = Hashie::Clash.new.foo(‘bar’) c.baz!.foo(123) # => c[:baz] c.baz!._end! # => c