Class: ROM::Commands::Composite

Inherits:
Pipeline::Composite show all
Defined in:
lib/rom/commands/composite.rb

Overview

Composite command that consists of left and right commands

Instance Attribute Summary

Attributes inherited from Pipeline::Composite

#left, #right

Instance Method Summary collapse

Methods inherited from Pipeline::Composite

#>>, #initialize

Methods included from Pipeline::Proxy

#respond_to_missing?

Constructor Details

This class inherits a constructor from ROM::Pipeline::Composite

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class ROM::Pipeline::Proxy

Instance Method Details

#call(*args) ⇒ Object Also known as: []

Calls the composite command

Right command is called with a result from the left one

Returns:

  • (Object) 


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# File 'lib/rom/commands/composite.rb', line 16

def call(*args)
  response = left.call(*args)

  if response.nil? || (many? && response.size == 0)
    return one? ? nil : EMPTY_ARRAY
  end

  if one? && !graph?
    if right.is_a?(Command) || right.is_a?(Commands::Composite)
      right.call([response].first)
    else
      right.call([response]).first
    end
  elsif one? && graph?
    right.call(response).first
  else
    right.call(response)
  end
end

#decorate?(response) ⇒ Boolean

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns:

  • (Boolean) 


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# File 'lib/rom/commands/composite.rb', line 48

def decorate?(response)
  super || response.is_a?(Graph)
end

#graph? ⇒ Boolean

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns:

  • (Boolean) 


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# File 'lib/rom/commands/composite.rb', line 38

def graph?
  left.is_a?(Graph)
end

#result ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/rom/commands/composite.rb', line 43

def result
  left.result
end