Module: PresenterRails

Defined in:
lib/presenter_rails.rb,
lib/presenter_rails/version.rb

Constant Summary collapse

VERSION = 
"3.0.0"

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.ivar_for(name) ⇒ Object

Internal: Name of the instance variable used to memoize a presenter method.



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# File 'lib/presenter_rails.rb', line 35

def self.ivar_for(name)
  "@_presenter_#{ name.to_s.gsub("?", "_query").gsub("!", "_bang") }"
end

.method_name_for(name) ⇒ Object

Internal: Name of the presenter method as defined in the controller.



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# File 'lib/presenter_rails.rb', line 30

def self.method_name_for(name)
  "#{ name }_presenter"
end

Instance Method Details

#present(name, &block) ⇒ Object

Public: Defines a method and makes it available to the view context under the specified name as a memoized variable.

name - The name of the method as called from the view context. block - Executed once if (and only if) the method is called.

Returns nothing.



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# File 'lib/presenter_rails.rb', line 12

def present(name, &block)
  presenter_method = PresenterRails.method_name_for(name)
  ivar = PresenterRails.ivar_for(name)

  private define_method(presenter_method) {
    if instance_variable_defined?(ivar)
      instance_variable_get(ivar)
    else
      instance_variable_set(ivar, instance_exec(&block))
    end
  }

  helper Module.new {
    define_method(name) { controller.send(presenter_method) }
  }
end