Class: Mongoid::Association::Referenced::HasMany::Proxy

Inherits:
Many
  • Object
show all
Defined in:
lib/mongoid/association/referenced/has_many/proxy.rb

Overview

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

Since:

  • 7.0

Instance Attribute Summary

Attributes inherited from Proxy

#_association, #_base, #_target

Class Method Summary collapse

Instance Method Summary collapse

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

Methods included from Marshalable

#marshal_dump, #marshal_load

Constructor Details

#initialize(base, target, association) ⇒ Proxy

Instantiate a new references_many relation. Will set the foreign key and the base on the inverse object.

Examples:

Create the new relation.

Referenced::Many.new(base, target, association)

Parameters:

  • base (Document) —

    The document this relation hangs off of.

  • target (Array<Document>) —

    The target of the relation.

  • association (Association) —

    The association metadata.

Since:

  • 2.0.0.beta.1



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# File 'lib/mongoid/association/referenced/has_many/proxy.rb', line 212

def initialize(base, target, association)
  enum = HasMany::Targets::Enumerable.new(target, base, association)
  init(base, enum, association) do
    raise_mixed if klass.embedded? && !klass.cyclic?
  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.

Since:

  • 2.0.0.beta.1



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# File 'lib/mongoid/association/referenced/has_many/proxy.rb', line 436

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

Class Method Details

.eager_loader(association, docs) ⇒ Object

Since:

  • 7.0



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# File 'lib/mongoid/association/referenced/has_many/proxy.rb', line 557

def eager_loader(association, docs)
  Eager.new(association, docs)
end

.embedded? ⇒ false

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

Examples:

Is this relation embedded?

Referenced::Many.embedded?

Returns:

  • (false) —

    Always false.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/association/referenced/has_many/proxy.rb', line 570

def embedded?
  false
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



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# File 'lib/mongoid/association/referenced/has_many/proxy.rb', line 31

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

#build(attributes = {}, type = nil) {|doc| ... } ⇒ 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")

Parameters:

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

    The attributes of the new document.

  • type (Class) (defaults to: nil) —

    The optional subclass to build.

Yields:

  • (doc)

Returns:

Since:

  • 2.0.0.beta.1



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# File 'lib/mongoid/association/referenced/has_many/proxy.rb', line 77

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



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# File 'lib/mongoid/association/referenced/has_many/proxy.rb', line 54

def concat(documents)
  docs, inserts = [], []
  documents.each do |doc|
    next unless doc
    append(doc)
    save_or_delay(doc, docs, inserts) if persistable?
  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



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# File 'lib/mongoid/association/referenced/has_many/proxy.rb', line 100

def delete(document)
  execute_callback :before_remove, document
  _target.delete(document) do |doc|
    if doc
      unbind_one(doc)
      cascade!(doc) if !_assigning?
    end
    execute_callback :after_remove, doc
  end
end

#delete_all(conditions = nil) ⇒ Integer

Deletes all related documents from the database given the supplied conditions.

Examples:

Delete all documents in the relation.

person.posts.delete_all

Conditonally delete all documents in the relation.

person.posts.delete_all({ :title => "Testing" })

Parameters:

  • conditions (Hash) (defaults to: nil) —

    Optional conditions to delete with.

Returns:

  • (Integer) —

    The number of documents deleted.

Since:

  • 2.0.0.beta.1



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# File 'lib/mongoid/association/referenced/has_many/proxy.rb', line 125

def delete_all(conditions = nil)
  remove_all(conditions, :delete_all)
end

#destroy_all(conditions = nil) ⇒ Integer

Destroys all related documents from the database given the supplied conditions.

Examples:

Destroy all documents in the relation.

person.posts.destroy_all

Conditonally destroy all documents in the relation.

person.posts.destroy_all({ :title => "Testing" })

Parameters:

  • conditions (Hash) (defaults to: nil) —

    Optional conditions to destroy with.

Returns:

  • (Integer) —

    The number of documents destroyd.

Since:

  • 2.0.0.beta.1



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# File 'lib/mongoid/association/referenced/has_many/proxy.rb', line 143

def destroy_all(conditions = nil)
  remove_all(conditions, :destroy_all)
end

#each ⇒ Array<Document>

Note:

This will load the entire relation into memory.

Iterate over each document in the relation and yield to the provided block.

Examples:

Iterate over the documents.

person.posts.each do |post|
  post.save
end

Returns:

  • (Array<Document>) —

    The loaded docs.

Since:

  • 2.1.0



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# File 'lib/mongoid/association/referenced/has_many/proxy.rb', line 160

def each
  if block_given?
    _target.each { |doc| yield(doc) }
  else
    to_enum
  end
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.

Since:

  • 7.0



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# File 'lib/mongoid/association/referenced/has_many/proxy.rb', line 174

def exists?
  criteria.exists?
end

#find(*args) ⇒ Document, Criteria

Note:

This will keep matching documents in memory for iteration later.

Find the matchind document on the association, either based on id or conditions.

Examples:

Find by an id.

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

Find by multiple ids.

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

Parameters:

Returns:

Since:

  • 2.0.0.beta.1



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# File 'lib/mongoid/association/referenced/has_many/proxy.rb', line 195

def find(*args)
  matching = criteria.find(*args)
  Array(matching).each { |doc| _target.push(doc) }
  matching
end

#nullify ⇒ Object Also known as: nullify_all

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.posts.nullify

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/association/referenced/has_many/proxy.rb', line 227

def nullify
  criteria.update_all(foreign_key => nil)
  _target.clear do |doc|
    unbind_one(doc)
    doc.changed_attributes.delete(foreign_key)
  end
end

#purge ⇒ Many Also known as: clear

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

Examples:

Clear the relation.

person.posts.clear

Returns:

  • (Many) —

    The relation emptied.

Since:

  • 2.0.0.beta.1



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# File 'lib/mongoid/association/referenced/has_many/proxy.rb', line 246

def purge
  unless _association.destructive?
    nullify
  else
    after_remove_error = nil
    criteria.delete_all
    many = _target.clear do |doc|
      execute_callback :before_remove, doc
      unbind_one(doc)
      doc.destroyed = true
      begin
        execute_callback :after_remove, doc
      rescue => e
        after_remove_error = e
      end
    end
    raise after_remove_error if after_remove_error
    many
  end
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.

Examples:

Replace the relation.

person.posts.substitute([ new_post ])

Parameters:

  • replacement (Array<Document>) —

    The replacement target.

Returns:

  • (Many) —

    The relation.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/association/referenced/has_many/proxy.rb', line 281

def substitute(replacement)
  if replacement
    new_docs, docs = replacement.compact, []
    new_ids = new_docs.map { |doc| doc._id }
    remove_not_in(new_ids)
    new_docs.each do |doc|
      docs.push(doc) if doc.send(foreign_key) != _base.send(_association.primary_key)
    end
    concat(docs)
  else
    purge
  end
  self
end

#unscoped ⇒ Criteria

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

Examples:

Get the unscoped criteria.

person.posts.unscoped

Returns:

Since:

  • 2.4.0



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# File 'lib/mongoid/association/referenced/has_many/proxy.rb', line 305

def unscoped
  klass.unscoped.where(foreign_key => _base.send(_association.primary_key))
end