Class: Mongoid::Relations::Embedded::One

Inherits:
One show all
Defined in:
lib/mongoid/relations/embedded/one.rb

Overview

This class defines the behaviour needed for embedded one to one relations.

Instance Attribute Summary

Attributes inherited from Proxy

#base, #loaded, #metadata, #target

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from One

#in_memory, #respond_to?

Methods inherited from Proxy

#init, #substitutable

Constructor Details

#initialize(base, target, metadata) ⇒ One

Instantiate a new embeds_one relation.

Examples:

Create the new proxy.

One.new(person, name, metadata)

Parameters:

  • base (Document) —

    The document this relation hangs off of.

  • target (Document) —

    The child document in the relation.

  • metadata (Metadata) —

    The relation’s metadata



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# File 'lib/mongoid/relations/embedded/one.rb', line 18

def initialize(base, target, metadata)
  init(base, target, metadata) do
    characterize_one(target)
    bind_one
    target.save if persistable?
  end
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class Mongoid::Relations::Proxy

Class Method Details

.builder(meta, object, loading = false) ⇒ Builder

Return the builder that is responsible for generating the documents that will be used by this relation.

Examples:

Get the builder.

Embedded::One.builder(meta, object, person)

Parameters:

  • meta (Metadata) —

    The metadata of the relation.

  • object (Document, Hash) —

    A document or attributes to build with.

Returns:

  • (Builder) —

    A newly instantiated builder object.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/embedded/one.rb', line 93

def builder(meta, object, loading = false)
  Builders::Embedded::One.new(meta, object, loading)
end

.embedded? ⇒ true

Returns true if the relation is an embedded one. In this case always true.

Examples:

Is this relation embedded?

Embedded::One.embedded?

Returns:

  • (true) —

    true.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/embedded/one.rb', line 106

def embedded?
  true
end

.macro ⇒ Symbol

Returns the macro for this relation. Used mostly as a helper in reflection.

Examples:

Get the macro.

Mongoid::Relations::Embedded::One.macro

Returns:

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/embedded/one.rb', line 119

def macro
  :embeds_one
end

.nested_builder(metadata, attributes, options) ⇒ Builder

Return the nested builder that is responsible for generating the documents that will be used by this relation.

Examples:

Get the builder.

NestedAttributes::One.builder(attributes, options)

Parameters:

  • metadata (Metadata) —

    The relation metadata.

  • attributes (Hash) —

    The attributes to build with.

  • options (Hash) —

    The options for the builder.

Options Hash (options):

  • :allow_destroy (true, false) —

    Can documents be deleted?

  • :limit (Integer) —

    Max number of documents to create at once.

  • :reject_if (Proc, Symbol) —

    If documents match this option then they are ignored.

  • :update_only (true, false) —

    Only existing documents can be modified.

Returns:

  • (Builder) —

    A newly instantiated nested builder object.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/embedded/one.rb', line 145

def nested_builder(metadata, attributes, options)
  Builders::NestedAttributes::One.new(metadata, attributes, options)
end

.path(document) ⇒ Mongoid::Atomic::Paths::Embedded::One

Get the path calculator for the supplied document.

Examples:

Get the path calculator.

Proxy.path(document)

Parameters:

  • document (Document) —

    The document to calculate on.

Returns:

Since:

  • 2.1.0



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# File 'lib/mongoid/relations/embedded/one.rb', line 160

def path(document)
  Mongoid::Atomic::Paths::Embedded::One.new(document)
end

.stores_foreign_key? ⇒ false

Tells the caller if this relation is one that stores the foreign key on its own objects.

Examples:

Does this relation store a foreign key?

Embedded::One.stores_foreign_key?

Returns:

  • (false) —

    false.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/embedded/one.rb', line 173

def stores_foreign_key?
  false
end

.valid_options ⇒ Array<Symbol>

Get the valid options allowed with this relation.

Examples:

Get the valid options.

Relation.valid_options

Returns:

Since:

  • 2.1.0



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# File 'lib/mongoid/relations/embedded/one.rb', line 185

def valid_options
  [ :as, :cyclic ]
end

.validation_default ⇒ true, false

Get the default validation setting for the relation. Determines if by default a validates associated will occur.

Examples:

Get the validation default.

Proxy.validation_default

Returns:

  • (true, false) —

    The validation default.

Since:

  • 2.1.9



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# File 'lib/mongoid/relations/embedded/one.rb', line 198

def validation_default
  true
end

Instance Method Details

#substitute(replacement) ⇒ Document?

Substitutes the supplied target documents for the existing document in the relation.

Examples:

Substitute the new document.

person.name.substitute(new_name)

Parameters:

  • other (Document) —

    A document to replace the target.

Returns:

  • (Document, nil) —

    The relation or nil.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/embedded/one.rb', line 37

def substitute(replacement)
  tap do |proxy|
    if assigning?
      base.atomic_unsets.push(proxy.atomic_path)
    else
      proxy.delete if persistable?
    end
    proxy.unbind_one
    return nil unless replacement
    proxy.target = replacement
    proxy.bind_one
  end
end