Class: Mongoid::Relations::Embedded::Many

Inherits:
Many
  • Object
show all
Includes:
Batchable
Defined in:
lib/mongoid/relations/embedded/many.rb

Overview

This class handles the behaviour for a document that embeds many other documents within in it as an array.

Instance Attribute Summary

Attributes inherited from Proxy

#__metadata, #base, #target

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Batchable

#batch_clear, #batch_push, #batch_remove, #batch_replace

Methods included from Positional

#positionally

Methods inherited from Many

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

Methods inherited from Proxy

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

Methods included from Marshalable

#marshal_dump, #marshal_load

Constructor Details

#initialize(base, target, metadata) ⇒ Many

Instantiate a new embeds_many relation.

Examples:

Create the new relation.

Many.new(person, addresses, metadata)

Parameters:

  • base (Document) —

    The document this relation hangs off of.

  • target (Array<Document>) —

    The child documents of the relation.

  • metadata (Metadata) —

    The relation’s metadata



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# File 'lib/mongoid/relations/embedded/many.rb', line 236

def initialize(base, target, metadata)
  init(base, target, metadata) do
    target.each_with_index do |doc, index|
      integrate(doc)
      doc._index = index
    end
    @_unscoped = target.dup
    @target = scope(target)
  end
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(name, *args, &block) ⇒ Criteria, Object (private)

If the target array does not respond to the supplied method then try to find a named scope or criteria on the class and send the call there.

If the method exists on the array, use the default proxy behavior.

Parameters:

  • name (Symbol, String) —

    The name of the method.

  • args (Array) —

    The method args

  • block (Proc) —

    Optional block to pass.

Returns:

  • (Criteria, Object) —

    A Criteria or return value from the target.



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# File 'lib/mongoid/relations/embedded/many.rb', line 404

def method_missing(name, *args, &block)
  return super if target.respond_to?(name)
  klass.send(:with_scope, criteria) do
    criteria.public_send(name, *args, &block)
  end
end

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.

Embedded::Many.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 newly instantiated builder object.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/embedded/many.rb', line 515

def builder(base, meta, object)
  Builders::Embedded::Many.new(base, meta, object)
end

.embedded? ⇒ true

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

Examples:

Is the relation embedded?

Embedded::Many.embedded?

Returns:

  • (true) —

    true.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/embedded/many.rb', line 528

def embedded?
  true
end

.foreign_key_suffix ⇒ nil

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

Examples:

Get the suffix for the foreign key.

Referenced::Many.foreign_key_suffix

Returns:

  • (nil) —

    nil.

Since:

  • 3.0.0



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# File 'lib/mongoid/relations/embedded/many.rb', line 540

def foreign_key_suffix
  nil
end

.macro ⇒ Symbol

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

Examples:

Get the relation macro.

Mongoid::Relations::Embedded::Many.macro

Returns:

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/embedded/many.rb', line 553

def macro
  :embeds_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.

NestedAttributes::Many.builder(attributes, options)

Parameters:

  • metadata (Metadata) —

    The relation metadata.

  • attributes (Hash) —

    The attributes to build with.

  • options (Hash) —

    The builder options.

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:

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/embedded/many.rb', line 579

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

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

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/many.rb', line 594

def path(document)
  Mongoid::Atomic::Paths::Embedded::Many.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::Many.stores_foreign_key?

Returns:

  • (false) —

    false.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/embedded/many.rb', line 607

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:

  • (Array<Symbol>) —

    The valid options.

Since:

  • 2.1.0



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# File 'lib/mongoid/relations/embedded/many.rb', line 619

def valid_options
  [
    :as, :cascade_callbacks, :cyclic, :order, :store_as,
    :before_add, :after_add, :before_remove, :after_remove
  ]
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/many.rb', line 635

def validation_default
  true
end

Instance Method Details

#<<(*args) ⇒ Object 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.addresses << address

Push a document.

person.addresses.push(address)

Parameters:



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# File 'lib/mongoid/relations/embedded/many.rb', line 24

def <<(*args)
  docs = args.flatten
  return concat(docs) if docs.size > 1
  if doc = docs.first
    append(doc)
    doc.save if persistable? && !_assigning?
  end
  self
end

#as_document ⇒ Array<Hash>

Get this relation as as its representation in the database.

Examples:

Convert the relation to an attributes hash.

person.addresses.as_document

Returns:

  • (Array<Hash>) —

    The relation as stored in the db.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/embedded/many.rb', line 43

def as_document
  attributes = []
  _unscoped.each do |doc|
    attributes.push(doc.as_document)
  end
  attributes
end

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

Builds a new document in the relation and appends it to the target. Takes an optional type if you want to specify a subclass.

Examples:

Build a new document on the relation.

person.people.build(:name => "Bozo")

Overloads:

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

    Parameters:

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

      The attributes to build the document with.

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

      Optional class to build the document with.

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

    Parameters:

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

      The attributes to build the document with.

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

      Optional class to build the document with.

Yields:

  • (doc)

Returns:



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# File 'lib/mongoid/relations/embedded/many.rb', line 82

def build(attributes = {}, type = nil)
  doc = Factory.build(type || __metadata.klass, attributes)
  append(doc)
  doc.apply_post_processed_defaults
  yield(doc) if block_given?
  doc.run_callbacks(:build) { doc }
  base._reset_memoized_children!
  doc
end

#clear ⇒ Many

Clear the relation. Will delete the documents from the db if they are already persisted.

Examples:

Clear the relation.

person.addresses.clear

Returns:

  • (Many) —

    The empty relation.



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# File 'lib/mongoid/relations/embedded/many.rb', line 100

def clear
  batch_clear(target.dup)
  self
end

#concat(docs) ⇒ 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.addresses.concat([ address_one, address_two ])

Parameters:

  • docs (Array<Document>) —

    The docs to add.

Returns:

Since:

  • 2.4.0



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# File 'lib/mongoid/relations/embedded/many.rb', line 62

def concat(docs)
  batch_push(docs) unless docs.empty?
  self
end

#count ⇒ Integer

Returns a count of the number of documents in the association that have actually been persisted to the database.

Use #size if you want the total number of documents.

Examples:

Get the count of persisted documents.

person.addresses.count

Returns:

  • (Integer) —

    The total number of persisted embedded docs, as flagged by the #persisted? method.



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# File 'lib/mongoid/relations/embedded/many.rb', line 115

def count
  target.select { |doc| doc.persisted? }.size
end

#delete(document) ⇒ Document?

Delete the supplied document from the target. This method is proxied in order to reindex the array after the operation occurs.

Examples:

Delete the document from the relation.

person.addresses.delete(address)

Parameters:

  • document (Document) —

    The document to be deleted.

Returns:

  • (Document, nil) —

    The deleted document or nil if nothing deleted.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/embedded/many.rb', line 130

def delete(document)
  execute_callback :before_remove, document
  doc = target.delete_one(document)
  if doc && !_binding?
    _unscoped.delete_one(doc)
    if _assigning?
      base.add_atomic_pull(doc)
    else
      doc.delete(suppress: true)
      unbind_one(doc)
    end
  end
  reindex
  execute_callback :after_remove, document
  doc
end

#delete_all(conditions = {}) ⇒ Integer

Delete all the documents in the association without running callbacks.

Examples:

Delete all documents from the relation.

person.addresses.delete_all

Conditionally delete documents from the relation.

person.addresses.delete_all({ :street => "Bond" })

Parameters:

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

    Conditions on which documents to delete.

Returns:

  • (Integer) —

    The number of documents deleted.



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# File 'lib/mongoid/relations/embedded/many.rb', line 158

def delete_all(conditions = {})
  remove_all(conditions, :delete)
end

#delete_if ⇒ Many, Enumerator

Delete all the documents for which the provided block returns true.

Examples:

Delete the matching documents.

person.addresses.delete_if do |doc|
  doc.state == "GA"
end

Returns:

  • (Many, Enumerator) —

    The relation or an enumerator if no block was provided.

Since:

  • 3.1.0



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

def delete_if
  if block_given?
    dup_target = target.dup
    dup_target.each do |doc|
      delete(doc) if yield(doc)
    end
    self
  else
    super
  end
end

#destroy_all(conditions = {}) ⇒ Integer

Destroy all the documents in the association whilst running callbacks.

Examples:

Destroy all documents from the relation.

person.addresses.destroy_all

Conditionally destroy documents from the relation.

person.addresses.destroy_all({ :street => "Bond" })

Parameters:

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

    Conditions on which documents to destroy.

Returns:

  • (Integer) —

    The number of documents destroyed.



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# File 'lib/mongoid/relations/embedded/many.rb', line 196

def destroy_all(conditions = {})
  remove_all(conditions, :destroy)
end

#exists? ⇒ true, false

Determine if any documents in this relation exist in the database.

Examples:

Are there persisted documents?

person.posts.exists?

Returns:

  • (true, false) —

    True is persisted documents exist, false if not.



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# File 'lib/mongoid/relations/embedded/many.rb', line 206

def exists?
  count > 0
end

#find(*args) ⇒ Array<Document>, Document

Finds a document in this association through several different methods.

Examples:

Find a document by its id.

person.addresses.find(BSON::ObjectId.new)

Find documents for multiple ids.

person.addresses.find([ BSON::ObjectId.new, BSON::ObjectId.new ])

Parameters:

  • args (Array<Object>) —

    Various arguments.

Returns:



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# File 'lib/mongoid/relations/embedded/many.rb', line 222

def find(*args)
  criteria.find(*args)
end

#in_memory ⇒ Array<Document>

Get all the documents in the relation that are loaded into memory.

Examples:

Get the in memory documents.

relation.in_memory

Returns:

  • (Array<Document>) —

    The documents in memory.

Since:

  • 2.1.0



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# File 'lib/mongoid/relations/embedded/many.rb', line 255

def in_memory
  target
end

#pop(count = nil) ⇒ Document+

Pop documents off the relation. This can be a single document or multiples, and will automatically persist the changes.

Examples:

Pop a single document.

relation.pop

Pop multiple documents.

relation.pop(3)

Parameters:

  • count (Integer) (defaults to: nil) —

    The number of documents to pop, or 1 if not provided.

Returns:

Since:

  • 3.0.0



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# File 'lib/mongoid/relations/embedded/many.rb', line 274

def pop(count = nil)
  if count
    if docs = target[target.size - count, target.size]
      docs.each { |doc| delete(doc) }
    end
  else
    delete(target[-1])
  end
end

#substitute(docs) ⇒ Many

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

Examples:

Substitute the relation’s target.

person.addresses.substitute([ address ])

Parameters:

  • docs (Array<Document>) —

    The replacement docs.

Returns:

  • (Many) —

    The proxied relation.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/embedded/many.rb', line 295

def substitute(docs)
  batch_replace(docs)
  self
end

#unscoped ⇒ Criteria

Return the relation with all previous scoping removed. This is the exact representation of the docs in the database.

Examples:

Get the unscoped documents.

person.addresses.unscoped

Returns:

Since:

  • 2.4.0



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# File 'lib/mongoid/relations/embedded/many.rb', line 309

def unscoped
  criterion = klass.unscoped
  criterion.embedded = true
  criterion.documents = _unscoped.delete_if(&:marked_for_destruction?)
  criterion
end