Parameter Chain
Parameter Chain allows you to chain methods to specify parameters, e.g.
instance.bar(123).baz(321)Which would be equivalent to:
instance.some_method(:bar => 123, :baz => 321)Parameter Chain provides a great out-of-the-box interface for dealing with search, or querying an API:
api = SomeApi.new(key)
api.category(3).price('> 1000').brand(:apple)Which would be equivalent to:
api = SomeApi.new(key)
api.search(:category => 3, :price => '> 1000', :brand => :apple)Setup
gem install parameter_chain
require 'parameter_chain'
class MyClass
def my_method(params = {})
# Do something with params, e.g.
"Params: #{params.inspect}"
end
parameter_chain :my_method, :foo, :bar
end
instance = MyClass.new
instance.foo(123).bar(321)
#=> "Params: { :foo => 123, :bar => 321 }"Lazy Evaluation
Parameter chains are evaluated lazily. When you call something on the end of your chain, it passes the parameters to the method and evaluates.
If you're in IRB, the inspect method is called implicitly. This is why your chains look like hashes. You can verify this by running:
instance.foo(123).bar(321).__class__
#=> ParameterChainComing Soon
Chaining from class methods, e.g.
MyClass.foo(123).bar(321)