Class: Mongoid::Relations::Cascading::Nullify

Inherits:
Object
  • Object
show all
Defined in:
lib/mongoid/relations/cascading/nullify.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(document, metadata) ⇒ Strategy

Initialize the new cascade strategy, which will set up the relation and the metadata.

Examples:

Instantiate the strategy

Strategy.new(document, metadata)

Parameters:

  • document (Document) —

    The document to cascade from.

  • metadata (Metadata) —

    The relation’s metadata.



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# File 'lib/mongoid/relations/cascading/nullify.rb', line 19

def initialize(document, metadata)
  @document, @metadata = document, metadata
  @relation = document.send(metadata.name)
end

Instance Attribute Details

#document ⇒ Object

Returns the value of attribute document.



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# File 'lib/mongoid/relations/cascading/nullify.rb', line 7

def document
  @document
end

#metadata ⇒ Object

Returns the value of attribute metadata.



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# File 'lib/mongoid/relations/cascading/nullify.rb', line 7

def metadata
  @metadata
end

#relation ⇒ Object

Returns the value of attribute relation.



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# File 'lib/mongoid/relations/cascading/nullify.rb', line 7

def relation
  @relation
end

Instance Method Details

#cascade ⇒ Object

This cascade does not delete the referenced relations, but instead sets the foreign key values to nil.

Examples:

Nullify the reference.

strategy.cascade


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# File 'lib/mongoid/relations/cascading/nullify.rb', line 29

def cascade
  relation.nullify if relation
end