Class: ActiveRecord::Associations::Builder::Association

Inherits:
Object
  • Object
show all
Defined in:
activerecord/lib/active_record/associations/builder/association.rb

Overview

:nodoc:

Direct Known Subclasses

CollectionAssociation, SingularAssociation

Class Attribute Summary collapse

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(model, name, scope, options) ⇒ Association

Returns a new instance of Association.

Raises:

  • (ArgumentError) 


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# File 'activerecord/lib/active_record/associations/builder/association.rb', line 29

def initialize(model, name, scope, options)
  raise ArgumentError, "association names must be a Symbol" unless name.kind_of?(Symbol)

  @model   = model
  @name    = name

  if scope.is_a?(Hash)
    @scope   = nil
    @options = scope
  else
    @scope   = scope
    @options = options
  end

  if @scope && @scope.arity == 0
    prev_scope = @scope
    @scope = proc { instance_exec(&prev_scope) }
  end
end

Class Attribute Details

.extensions ⇒ Object

Returns the value of attribute extensions



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# File 'activerecord/lib/active_record/associations/builder/association.rb', line 17

def extensions
  @extensions
end

.valid_options ⇒ Object

Returns the value of attribute valid_options



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# File 'activerecord/lib/active_record/associations/builder/association.rb', line 16

def valid_options
  @valid_options
end

Instance Attribute Details

#model ⇒ Object (readonly)

Returns the value of attribute model



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# File 'activerecord/lib/active_record/associations/builder/association.rb', line 23

def model
  @model
end

#name ⇒ Object (readonly)

Returns the value of attribute name



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# File 'activerecord/lib/active_record/associations/builder/association.rb', line 23

def name
  @name
end

#options ⇒ Object (readonly)

Returns the value of attribute options



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# File 'activerecord/lib/active_record/associations/builder/association.rb', line 23

def options
  @options
end

#scope ⇒ Object (readonly)

Returns the value of attribute scope



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# File 'activerecord/lib/active_record/associations/builder/association.rb', line 23

def scope
  @scope
end

Class Method Details

.build(*args, &block) ⇒ Object 



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# File 'activerecord/lib/active_record/associations/builder/association.rb', line 25

def self.build(*args, &block)
  new(*args, &block).build
end

Instance Method Details

#build ⇒ Object 



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# File 'activerecord/lib/active_record/associations/builder/association.rb', line 53

def build
  validate_options
  define_accessors
  configure_dependency if options[:dependent]
  reflection = ActiveRecord::Reflection.create(macro, name, scope, options, model)
  Association.extensions.each do |extension|
    extension.build @model, reflection
  end
  reflection
end

#configure_dependency ⇒ Object 



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# File 'activerecord/lib/active_record/associations/builder/association.rb', line 104

def configure_dependency
  unless valid_dependent_options.include? options[:dependent]
    raise ArgumentError, "The :dependent option must be one of #{valid_dependent_options}, but is :#{options[:dependent]}"
  end

  n = name
  model.before_destroy lambda { |o| o.association(n).handle_dependency }
end

#define_accessors ⇒ Object

Defines the setter and getter methods for the association class Post < ActiveRecord::Base

has_many :comments

end

Post.first.comments and Post.first.comments= methods are defined by this method…



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# File 'activerecord/lib/active_record/associations/builder/association.rb', line 83

def define_accessors
  define_readers
  define_writers
end

#define_readers ⇒ Object 



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# File 'activerecord/lib/active_record/associations/builder/association.rb', line 88

def define_readers
  mixin.class_eval <<-CODE, __FILE__, __LINE__ + 1
    def #{name}(*args)
      association(:#{name}).reader(*args)
    end
  CODE
end

#define_writers ⇒ Object 



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# File 'activerecord/lib/active_record/associations/builder/association.rb', line 96

def define_writers
  mixin.class_eval <<-CODE, __FILE__, __LINE__ + 1
    def #{name}=(value)
      association(:#{name}).writer(value)
    end
  CODE
end

#macro ⇒ Object

Raises:

  • (NotImplementedError) 


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# File 'activerecord/lib/active_record/associations/builder/association.rb', line 64

def macro
  raise NotImplementedError
end

#mixin ⇒ Object 



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# File 'activerecord/lib/active_record/associations/builder/association.rb', line 49

def mixin
  @model.generated_feature_methods
end

#valid_dependent_options ⇒ Object

Raises:

  • (NotImplementedError) 


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# File 'activerecord/lib/active_record/associations/builder/association.rb', line 113

def valid_dependent_options
  raise NotImplementedError
end

#valid_options ⇒ Object 



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# File 'activerecord/lib/active_record/associations/builder/association.rb', line 68

def valid_options
  Association.valid_options + Association.extensions.flat_map(&:valid_options)
end

#validate_options ⇒ Object 



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# File 'activerecord/lib/active_record/associations/builder/association.rb', line 72

def validate_options
  options.assert_valid_keys(valid_options)
end