Class: Mongoid::Relations::Referenced::ManyToMany

Inherits:
Many
  • Object
show all
Defined in:
lib/mongoid/relations/referenced/many_to_many.rb

Overview

This class defines the behaviour for all relations that are a many-to-many between documents in different collections.

Instance Attribute Summary

Attributes inherited from Proxy

#base, #loaded, #metadata, #target

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Many

#delete_all, #destroy_all, #each, #exists?, #find, #initialize

Methods inherited from Many

#blank?, #create, #create!, #find_or_create_by, #find_or_initialize_by, #nil?, #respond_to?, #scoped, #serializable_hash

Methods inherited from Proxy

apply_ordering, eager_load_ids, #init, #klass, #reset_unloaded, #substitutable, #with

Methods included from Marshalable

#marshal_dump, #marshal_load

Constructor Details

This class inherits a constructor from Mongoid::Relations::Referenced::Many

Dynamic Method Handling

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

Class Method Details

.builder(base, meta, object) ⇒ Builder

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

Examples:

Get the builder.

Referenced::ManyToMany.builder(meta, object)

Parameters:

  • base (Document) —

    The base document.

  • meta (Metadata) —

    The metadata of the relation.

  • object (Document, Hash) —

    A document or attributes to build with.

Returns:

  • (Builder) —

    A new builder object.

Since:

  • 2.0.0.rc.1



298
299
300
 
# File 'lib/mongoid/relations/referenced/many_to_many.rb', line 298

def builder(base, meta, object)
  Builders::Referenced::ManyToMany.new(base, meta, object)
end

.criteria(metadata, object, type = nil) ⇒ Criteria

Create the standard criteria for this relation given the supplied metadata and object.

Examples:

Get the criteria.

Proxy.criteria(meta, object)

Parameters:

  • metadata (Metadata) —

    The relation metadata.

  • object (Object) —

    The object for the criteria.

  • type (Class) (defaults to: nil) —

    The criteria class.

Returns:

Since:

  • 2.1.0



315
316
317
318
319
320
321
 
# File 'lib/mongoid/relations/referenced/many_to_many.rb', line 315

def criteria(metadata, object, type = nil)
  apply_ordering(
    metadata.klass.all_of(
      metadata.primary_key => { "$in" => object || [] }
    ), metadata
  )
end

.eager_load(metadata, ids) ⇒ Criteria

Get the criteria that is used to eager load a relation of this type.

Examples:

Get the eager load criteria.

Proxy.eager_load(metadata, criteria)

Parameters:

  • metadata (Metadata) —

    The relation metadata.

  • ids (Array<Object>) —

    The ids of the documents to load.

Returns:

  • (Criteria) —

    The criteria to eager load the relation.

Since:

  • 2.2.0



335
336
337
338
339
 
# File 'lib/mongoid/relations/referenced/many_to_many.rb', line 335

def eager_load(metadata, ids)
  metadata.klass.any_in(_id: ids).each do |doc|
    IdentityMap.set(doc)
  end
end

.embedded? ⇒ false

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

Examples:

Is this relation embedded?

Referenced::ManyToMany.embedded?

Returns:

  • (false) —

    Always false.

Since:

  • 2.0.0.rc.1



350
351
352
 
# File 'lib/mongoid/relations/referenced/many_to_many.rb', line 350

def embedded?
  false
end

.foreign_key(name) ⇒ String

Get the foreign key for the provided name.

Examples:

Get the foreign key.

Referenced::ManyToMany.foreign_key(:person)

Parameters:

Returns:

  • (String) —

    The foreign key.

Since:

  • 3.0.0



364
365
366
 
# File 'lib/mongoid/relations/referenced/many_to_many.rb', line 364

def foreign_key(name)
  "#{name.to_s.singularize}#{foreign_key_suffix}"
end

.foreign_key_default ⇒ Array

Get the default value for the foreign key.

Examples:

Get the default.

Referenced::ManyToMany.foreign_key_default

Returns:

  • (Array) —

    Always an empty array.

Since:

  • 2.0.0.rc.1



376
377
378
 
# File 'lib/mongoid/relations/referenced/many_to_many.rb', line 376

def foreign_key_default
  []
end

.foreign_key_suffix ⇒ String

Returns the suffix of the foreign key field, either “_id” or “_ids”.

Examples:

Get the suffix for the foreign key.

Referenced::ManyToMany.foreign_key_suffix

Returns:

  • (String) —

    “_ids”

Since:

  • 2.0.0.rc.1



388
389
390
 
# File 'lib/mongoid/relations/referenced/many_to_many.rb', line 388

def foreign_key_suffix
  "_ids"
end

.macro ⇒ Symbol

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

Examples:

Get the macro.

Referenced::ManyToMany.macro

Returns:

  • (Symbol) —

    :has_and_belongs_to_many



399
400
401
 
# File 'lib/mongoid/relations/referenced/many_to_many.rb', line 399

def macro
  :has_and_belongs_to_many
end

.nested_builder(metadata, attributes, options) ⇒ NestedBuilder

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

Examples:

Get the nested builder.

Referenced::ManyToMany.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:

  • (NestedBuilder) —

    A newly instantiated nested builder object.

Since:

  • 2.0.0.rc.1



425
426
427
 
# File 'lib/mongoid/relations/referenced/many_to_many.rb', line 425

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

.path(document) ⇒ Root

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:

  • (Root) —

    The root atomic path calculator.

Since:

  • 2.1.0



439
440
441
 
# File 'lib/mongoid/relations/referenced/many_to_many.rb', line 439

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

.stores_foreign_key? ⇒ true

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?

Referenced::Many.stores_foreign_key?

Returns:

  • (true) —

    Always true.

Since:

  • 2.0.0.rc.1



452
453
454
 
# File 'lib/mongoid/relations/referenced/many_to_many.rb', line 452

def stores_foreign_key?
  true
end

.valid_options ⇒ Array<Symbol>

Get the valid options allowed with this relation.

Examples:

Get the valid options.

Relation.valid_options

Returns:

  • (Array<Symbol>) —

    The valid options.

Since:

  • 2.1.0



464
465
466
467
468
469
470
471
472
473
474
475
476
477
 
# File 'lib/mongoid/relations/referenced/many_to_many.rb', line 464

def valid_options
  [
    :after_add,
    :after_remove,
    :autosave,
    :before_add,
    :before_remove,
    :dependent,
    :foreign_key,
    :index,
    :order,
    :primary_key
  ]
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



488
489
490
 
# File 'lib/mongoid/relations/referenced/many_to_many.rb', line 488

def validation_default
  true
end

Instance Method Details

#<<(*args) ⇒ Array<Document> Also known as: push

Appends a document or array of documents to the relation. Will set the parent and update the index in the process.

Examples:

Append a document.

person.posts << post

Push a document.

person.posts.push(post)

Concat with other documents.

person.posts.concat([ post_one, post_two ])

Parameters:

Returns:

  • (Array<Document>) —

    The loaded docs.

Since:

  • 2.0.0.beta.1



27
28
29
30
31
32
33
34
35
36
37
38
 
# File 'lib/mongoid/relations/referenced/many_to_many.rb', line 27

def <<(*args)
  docs = args.flatten
  return concat(docs) if docs.size > 1
  if doc = docs.first
    append(doc)
    base.add_to_set(foreign_key, doc.send(metadata.primary_key))
    if child_persistable?(doc)
      doc.save
    end
  end
  unsynced(base, foreign_key) and self
end

#build(attributes = {}, options = {}, type = nil) ⇒ Document #build(attributes = {}, type = nil) ⇒ Document Also known as: new

Build a new document from the attributes and append it to this relation without saving.

Examples:

Build a new document on the relation.

person.posts.build(:title => "A new post")

Overloads:

  • #build(attributes = {}, options = {}, type = nil) ⇒ Document

    Parameters:

    • attributes (Hash) (defaults to: {}) —

      The attributes of the new document.

    • options (Hash) (defaults to: {}) —

      The scoped assignment options.

    • type (Class) (defaults to: nil) —

      The optional subclass to build.

  • #build(attributes = {}, type = nil) ⇒ Document

    Parameters:

    • attributes (Hash) (defaults to: {}) —

      The attributes of the new document.

    • options (Hash) —

      The scoped assignment options.

    • type (Class) (defaults to: nil) —

      The optional subclass to build.

Yields:

  • (doc)

Returns:

Since:

  • 2.0.0.beta.1



93
94
95
96
97
98
99
100
101
102
103
104
105
 
# File 'lib/mongoid/relations/referenced/many_to_many.rb', line 93

def build(attributes = {}, options = {}, type = nil)
  if options.is_a? Class
    options, type = {}, options
  end

  doc = Factory.build(type || klass, attributes, options)
  base.send(foreign_key).push(doc.id)
  append(doc)
  doc.apply_post_processed_defaults
  unsynced(doc, inverse_foreign_key)
  yield(doc) if block_given?
  doc
end

#concat(documents) ⇒ Array<Document>

Appends an array of documents to the relation. Performs a batch insert of the documents instead of persisting one at a time.

Examples:

Concat with other documents.

person.posts.concat([ post_one, post_two ])

Parameters:

  • documents (Array<Document>) —

    The docs to add.

Returns:

Since:

  • 2.4.0



52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
 
# File 'lib/mongoid/relations/referenced/many_to_many.rb', line 52

def concat(documents)
  ids, docs, inserts = {}, [], []
  documents.each do |doc|
    next unless doc
    append(doc)
    if persistable? || _creating?
      ids[doc.id] = true
      save_or_delay(doc, docs, inserts)
    else
      existing = base.send(foreign_key)
      unless existing.include?(doc.id)
        existing.push(doc.id) and unsynced(base, foreign_key)
      end
    end
  end
  if persistable? || _creating?
    base.push_all(foreign_key, ids.keys)
  end
  persist_delayed(docs, inserts)
  self
end

#delete(document) ⇒ Document

Delete the document from the relation. This will set the foreign key on the document to nil. If the dependent options on the relation are :delete or :destroy the appropriate removal will occur.

Examples:

Delete the document.

person.posts.delete(post)

Parameters:

  • document (Document) —

    The document to remove.

Returns:

Since:

  • 2.1.0



120
121
122
123
124
125
126
127
128
 
# File 'lib/mongoid/relations/referenced/many_to_many.rb', line 120

def delete(document)
  doc = super
  if doc && persistable?
    base.pull(foreign_key, doc.send(metadata.primary_key))
    target._unloaded = criteria
    unsynced(base, foreign_key)
  end
  doc
end

#nullify ⇒ Object Also known as: nullify_all, clear, purge

Removes all associations between the base document and the target documents by deleting the foreign keys and the references, orphaning the target documents in the process.

Examples:

Nullify the relation.

person.preferences.nullify

Since:

  • 2.0.0.rc.1



138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
 
# File 'lib/mongoid/relations/referenced/many_to_many.rb', line 138

def nullify
  target.each do |doc|
    execute_callback :before_remove, doc
  end
  unless metadata.forced_nil_inverse?
    criteria.pull(inverse_foreign_key, base.id)
  end
  if persistable?
    base.set(
      foreign_key,
      base.send(foreign_key).clear
    )
  end
  after_remove_error = nil
  many_to_many = target.clear do |doc|
    unbind_one(doc)
    unless metadata.forced_nil_inverse?
      doc.changed_attributes.delete(inverse_foreign_key)
    end
    begin
      execute_callback :after_remove, doc
    rescue => e
      after_remove_error = e
    end
  end
  raise after_remove_error if after_remove_error
  many_to_many
end

#substitute(replacement) ⇒ Many

Substitutes the supplied target documents for the existing documents in the relation. If the new target is nil, perform the necessary deletion.

person.preferences.substitute([ new_post ])

Examples:

Replace the relation.

Parameters:

  • replacement (Array<Document>) —

    The replacement target.

Returns:

  • (Many) —

    The relation.

Since:

  • 2.0.0.rc.1



182
183
184
185
186
187
188
189
190
 
# File 'lib/mongoid/relations/referenced/many_to_many.rb', line 182

def substitute(replacement)
  purge
  unless replacement.blank?
    push(replacement.compact.uniq)
  else
    reset_unloaded
  end
  self
end

#unscoped ⇒ Criteria

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

Examples:

Get the unscoped criteria.

person.preferences.unscoped

Returns:

Since:

  • 2.4.0



201
202
203
 
# File 'lib/mongoid/relations/referenced/many_to_many.rb', line 201

def unscoped
  klass.unscoped.any_in(_id: base.send(foreign_key))
end