Class: Humanoid::Scope

Inherits:
Object show all
Defined in:
lib/humanoid/scope.rb

Overview

:nodoc:

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(parent, conditions, &block) ⇒ Scope

Create the new Scope. If a block is passed in, this Scope will extend the block.

Options:

parent: The class the scope belongs to, or a parent Scope. conditions: A Hash of conditions.

Example:

Humanoid::Scope.new(Person, { :title => "Sir" }) do
  def knighted?
    title == "Sir"
  end
end



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# File 'lib/humanoid/scope.rb', line 38

def initialize(parent, conditions, &block)
  @parent, @conditions = parent, conditions
  extend Module.new(&block) if block_given?
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(name, *args, &block) ⇒ Object

Chaining is supported through method_missing. If a scope is already defined with the method name the call will be passed there, otherwise it will be passed to the target or parent.



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# File 'lib/humanoid/scope.rb', line 52

def method_missing(name, *args, &block)
  if scopes.include?(name)
    scopes[name].call(self, *args)
  elsif klass
    target.send(name, *args, &block)
  else
    @parent.fuse(@conditions); @parent.send(name, *args, &block)
  end
end

Instance Attribute Details

#conditions ⇒ Object (readonly)

Returns the value of attribute conditions.



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# File 'lib/humanoid/scope.rb', line 7

def conditions
  @conditions
end

#parent ⇒ Object (readonly)

Returns the value of attribute parent.



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# File 'lib/humanoid/scope.rb', line 7

def parent
  @parent
end

Instance Method Details

#==(other) ⇒ Object

If the other is a scope then compare the parent and conditions, otherwise if its enumerable collect and compare.



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# File 'lib/humanoid/scope.rb', line 11

def ==(other)
  case other
  when Scope
    @parent == other.parent && @conditions == other.conditions
  when Enumerable
    @collection ||= entries
    return (@collection == other)
  else
    return false
  end
end

#klass ⇒ Object

Return the class for the Scope. This will be the parent if the parent is a class, otherwise will be nil.



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# File 'lib/humanoid/scope.rb', line 45

def klass
  @klass ||= @parent unless @parent.is_a?(Scope)
end

#respond_to?(name) ⇒ Boolean

The Scope must respond like a Criteria object. If this is a parent criteria delegate to the target, otherwise bubble up to the parent.

Returns:



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# File 'lib/humanoid/scope.rb', line 64

def respond_to?(name)
  super || (klass ? target.respond_to?(name) : @parent.respond_to?(name))
end

#target ⇒ Object

Returns the target criteria if it has already been set or creates a new criteria from the parent class.



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# File 'lib/humanoid/scope.rb', line 70

def target
  @target ||= klass.criteria.fuse(@conditions)
end