Class: Machinist::DataMapperAdapter

Inherits:
Object
  • Object
show all
Defined in:
lib/machinist/data_mapper.rb

Class Method Summary collapse

Class Method Details

.assigned_attributes_without_associations(lathe) ⇒ Object

This method takes care of converting any associated objects, in the hash returned by Lathe#assigned_attributes, into their object ids.

For example, let’s say we have blueprints like this:

Post.blueprint { }
Comment.blueprint { post }

Lathe#assigned_attributes will return { :post => … }, but we want to pass { :post_id => 1 } to a controller.

This method takes care of cleaning this up.



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# File 'lib/machinist/data_mapper.rb', line 40

def self.assigned_attributes_without_associations(lathe)
  attributes = {}
  lathe.assigned_attributes.each_pair do |attribute, value|
    association = lathe.object.class.relationships[attribute]
    if association && association_is_many_to_one?(association)
      # DataMapper child_key can have more than one property, but I'm not
      # sure in what circumstances this would be the case. I'm assuming
      # here that there's only one property.
      key = association.child_key.map(&:field).first.to_sym
      attributes[key] = value.id
    else
      attributes[attribute] = value
    end
  end
  attributes
end

.association_is_many_to_one?(association) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/machinist/data_mapper.rb', line 17

def self.association_is_many_to_one?(association)
  if defined?(DataMapper::Associations::ManyToOne::Relationship)
    # We're using the next branch of DM
    association.class == DataMapper::Associations::ManyToOne::Relationship
  else
    # We're using the 0.9 or less branch.
    association.options[:max].nil?
  end
end

.class_for_association(object, attribute) ⇒ Object 



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# File 'lib/machinist/data_mapper.rb', line 12

def self.class_for_association(object, attribute)
  association = object.class.relationships[attribute]
  association && association.parent_model
end

.has_association?(object, attribute) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/machinist/data_mapper.rb', line 8

def self.has_association?(object, attribute)
  object.class.relationships.has_key?(attribute)
end