class Mongoid::Association::Many

This is the superclass for all many to one and many to many association proxies.

Public Instance Methods

blank?() click to toggle source

Is the association empty?

@example Is the association empty??

person.addresses.blank?

@return [ true, false ] If the association is empty or not.

@since 2.1.0

# File lib/mongoid/association/many.rb, line 24
def blank?
  !any?
end
create(attributes = nil, type = nil, &block) click to toggle source

Creates a new document on the references many association. This will save the document if the parent has been persisted.

@example Create and save the new document.

person.posts.create(:text => "Testing")

@param [ Hash ] attributes The attributes to create with. @param [ Class ] type The optional type of document to create.

@return [ Document ] The newly created document.

@since 2.0.0.beta.1

# File lib/mongoid/association/many.rb, line 41
def create(attributes = nil, type = nil, &block)
  if attributes.is_a?(::Array)
    attributes.map { |attrs| create(attrs, type, &block) }
  else
    doc = build(attributes, type, &block)
    _base.persisted? ? doc.save : raise_unsaved(doc)
    doc
  end
end
create!(attributes = nil, type = nil, &block) click to toggle source

Creates a new document on the references many association. This will save the document if the parent has been persisted and will raise an error if validation fails.

@example Create and save the new document.

person.posts.create!(:text => "Testing")

@param [ Hash ] attributes The attributes to create with. @param [ Class ] type The optional type of document to create.

@raise [ Errors::Validations ] If validation failed.

@return [ Document ] The newly created document.

@since 2.0.0.beta.1

# File lib/mongoid/association/many.rb, line 66
def create!(attributes = nil, type = nil, &block)
  if attributes.is_a?(::Array)
    attributes.map { |attrs| create!(attrs, type, &block) }
  else
    doc = build(attributes, type, &block)
    _base.persisted? ? doc.save! : raise_unsaved(doc)
    doc
  end
end
find_or_create_by(attrs = {}, type = nil, &block) click to toggle source

Find the first document given the conditions, or creates a new document with the conditions that were supplied.

@example Find or create.

 person.posts.find_or_create_by(:title => "Testing")

@param [ Hash ] attrs The attributes to search or create with.
@param [ Class ] type The optional type of document to create.

@return [ Document ] An existing document or newly created one.

# File lib/mongoid/association/many.rb, line 86
def find_or_create_by(attrs = {}, type = nil, &block)
  find_or(:create, attrs, type, &block)
end
find_or_create_by!(attrs = {}, type = nil, &block) click to toggle source

Find the first document given the conditions, or creates a new document with the conditions that were supplied. This will raise an error if validation fails.

@example Find or create.

person.posts.find_or_create_by!(:title => "Testing")

@param [ Hash ] attrs The attributes to search or create with. @param [ Class ] type The optional type of document to create.

@raise [ Errors::Validations ] If validation failed.

@return [ Document ] An existing document or newly created one.

# File lib/mongoid/association/many.rb, line 102
def find_or_create_by!(attrs = {}, type = nil, &block)
  find_or(:create!, attrs, type, &block)
end
find_or_initialize_by(attrs = {}, type = nil, &block) click to toggle source

Find the first Document given the conditions, or instantiates a new document with the conditions that were supplied

@example Find or initialize.

person.posts.find_or_initialize_by(:title => "Test")

@param [ Hash ] attrs The attributes to search or initialize with. @param [ Class ] type The optional subclass to build.

@return [ Document ] An existing document or newly instantiated one.

# File lib/mongoid/association/many.rb, line 116
def find_or_initialize_by(attrs = {}, type = nil, &block)
  find_or(:build, attrs, type, &block)
end
nil?() click to toggle source

This proxy can never be nil.

@example Is the proxy nil?

relation.nil?

@return [ false ] Always false.

@since 2.0.0

# File lib/mongoid/association/many.rb, line 128
def nil?
  false
end
respond_to?(name, include_private = false) click to toggle source

Since method_missing is overridden we should override this as well.

@example Does the proxy respond to the method?

relation.respond_to?(:name)

@param [ Symbol ] name The method name. @param [ true, false ] include_private Whether to include private methods.

@return [ true, false ] If the proxy responds to the method.

@since 2.0.0

Calls superclass method
# File lib/mongoid/association/many.rb, line 143
def respond_to?(name, include_private = false)
  [].respond_to?(name, include_private) ||
    klass.respond_to?(name, include_private) || super
end
scoped() click to toggle source

This is public access to the association’s criteria.

@example Get the scoped association.

relation.scoped

@return [ Criteria ] The scoped criteria.

@since 2.1.0

# File lib/mongoid/association/many.rb, line 156
def scoped
  criteria
end
serializable_hash(options = {}) click to toggle source

Gets the document as a serializable hash, used by ActiveModel’s JSON and XML serializers. This override is just to be able to pass the :include and :except options to get associations in the hash.

@example Get the serializable hash.

relation.serializable_hash

@param [ Hash ] options The options to pass.

@option options [ Symbol ] :include What associations to include @option options [ Symbol ] :only Limit the fields to only these. @option options [ Symbol ] :except Dont include these fields.

@return [ Hash ] The documents, ready to be serialized.

@since 2.0.0.rc.6

# File lib/mongoid/association/many.rb, line 176
def serializable_hash(options = {})
  _target.map { |document| document.serializable_hash(options) }
end
unscoped() click to toggle source

Get a criteria for the embedded documents without the default scoping applied.

@example Get the unscoped criteria.

person.addresses.unscoped

@return [ Criteria ] The unscoped criteria.

@since 2.4.0

# File lib/mongoid/association/many.rb, line 189
def unscoped
  criteria.unscoped
end

Private Instance Methods

_session() click to toggle source
# File lib/mongoid/association/many.rb, line 195
def _session
  _base.send(:_session)
end
find_or(method, attrs = {}, type = nil, &block) click to toggle source

Find the first object given the supplied attributes or create/initialize it.

@example Find or create|initialize.

person.addresses.find_or(:create, :street => "Bond")

@param [ Symbol ] method The method name, create or new.
@param [ Hash ] attrs The attributes to search or build with.
@param [ Class ] type The optional subclass to build.

@return [ Document ] A matching document or a new/created one.

# File lib/mongoid/association/many.rb, line 209
def find_or(method, attrs = {}, type = nil, &block)
  attrs[klass.discriminator_key] = type.discriminator_value if type
  where(attrs).first || send(method, attrs, type, &block)
end