Class: Mongoid::Relations::Metadata

Inherits:
Hash show all
Defined in:
lib/mongoid/relations/metadata.rb

Overview

The “Grand Poobah” of information about any relation is this class. It contains everything you could ever possible want to know.

Instance Method Summary collapse

Methods included from Extensions::Hash::Scoping

#as_conditions

Methods included from Extensions::Hash::CriteriaHelpers

#expand_complex_criteria, #extract_id

Methods included from Extensions::Hash::DeepCopy

#_deep_copy

Constructor Details

#initialize(properties = {}) ⇒ Metadata

Instantiate new metadata for a relation.

Examples:

Create the new metadata.

Metadata.new(:name => :addresses)

Parameters:

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

    The relation options.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/metadata.rb', line 335

def initialize(properties = {})
  Options.validate!(properties)
  merge!(properties)
end

Instance Method Details

#as ⇒ true, false

Returns the as option of the relation.

Examples:

Get the as option.

metadata.as

Returns:

  • (true, false) —

    The as option.

Since:

  • 2.1.0



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# File 'lib/mongoid/relations/metadata.rb', line 19

def as
  self[:as]
end

#as? ⇒ true, false

Tells whether an as option exists.

Examples:

Is the as option set?

metadata.as?

Returns:

  • (true, false) —

    True if an as exists, false if not.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/metadata.rb', line 31

def as?
  !!as
end

#autosave ⇒ true, false

Returns the autosave option of the relation.

Examples:

Get the autosave option.

metadata.autosave

Returns:

  • (true, false) —

    The autosave option.

Since:

  • 2.1.0



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

def autosave
  self[:autosave]
end

#autosave? ⇒ true, false

Does the metadata have a autosave option?

Examples:

Is the relation autosaving?

metadata.autosave?

Returns:

  • (true, false) —

    If the relation autosaves.

Since:

  • 2.1.0



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# File 'lib/mongoid/relations/metadata.rb', line 55

def autosave?
  !!autosave
end

#builder(base, object) ⇒ Builder

Gets a relation builder associated with the relation this metadata is for.

Examples:

Get the builder.

metadata.builder(document)

Parameters:

  • base (Document) —

    The base document.

  • object (Object) —

    A document or attributes to give the builder.

Returns:

  • (Builder) —

    The builder for the relation.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/metadata.rb', line 71

def builder(base, object)
  relation.builder(base, self, object)
end

#cascade_strategy ⇒ Object

Returns the name of the strategy used for handling dependent relations.

Examples:

Get the strategy.

metadata.cascade_strategy

Returns:

  • (Object) —

    The cascading strategy to use.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/metadata.rb', line 83

def cascade_strategy
  if dependent?
    strategy =
      %{Mongoid::Relations::Cascading::#{dependent.to_s.classify}}
    strategy.constantize
  else
    return nil
  end
end

#cascading_callbacks? ⇒ true, false

Is this an embedded relations that allows callbacks to cascade down to it?

Examples:

Does the relation have cascading callbacks?

metadata.cascading_callbacks?

Returns:

  • (true, false) —

    If the relation cascades callbacks.

Since:

  • 2.3.0



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# File 'lib/mongoid/relations/metadata.rb', line 102

def cascading_callbacks?
  !!self[:cascade_callbacks]
end

#class_name ⇒ String

Returns the name of the class that this relation contains. If the class_name was provided as an option this will return that, otherwise it will determine the name from the name property.

Examples:

Get the class name.

metadata.class_name

Returns:

  • (String) —

    The name of the relation’s proxied class.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/metadata.rb', line 116

def class_name
  @class_name ||= (self[:class_name] || classify).sub(/^::/,"")
end

#constraint ⇒ Constraint

Get the foreign key contraint for the metadata.

Examples:

Get the constaint.

metadata.constraint

Returns:

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/metadata.rb', line 128

def constraint
  @constraint ||= Constraint.new(self)
end

#criteria(object, type = nil) ⇒ Criteria

Get the criteria that is used to query for this metadata’s relation.

Examples:

Get the criteria.

metadata.criteria([ id_one, id_two ])

Parameters:

  • object (Object) —

    The foreign key used for the query.

Returns:

Since:

  • 2.1.0



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# File 'lib/mongoid/relations/metadata.rb', line 142

def criteria(object, type = nil)
  query = relation.criteria(self, object, type)
  order ? query.order_by(order) : query
end

#cyclic ⇒ true, false

Returns the cyclic option of the relation.

Examples:

Get the cyclic option.

metadata.cyclic

Returns:

  • (true, false) —

    The cyclic option.

Since:

  • 2.1.0



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# File 'lib/mongoid/relations/metadata.rb', line 155

def cyclic
  self[:cyclic]
end

#cyclic? ⇒ true, false

Does the metadata have a cyclic option?

Examples:

Is the metadata cyclic?

metadata.cyclic?

Returns:

  • (true, false) —

    If the metadata is cyclic.

Since:

  • 2.1.0



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# File 'lib/mongoid/relations/metadata.rb', line 167

def cyclic?
  !!cyclic
end

#dependent ⇒ Symbol

Returns the dependent option of the relation.

Examples:

Get the dependent option.

metadata.dependent

Returns:

  • (Symbol) —

    The dependent option.

Since:

  • 2.1.0



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# File 'lib/mongoid/relations/metadata.rb', line 179

def dependent
  self[:dependent]
end

#dependent? ⇒ true, false

Does the metadata have a dependent option?

Examples:

Is the metadata performing cascades?

metadata.dependent?

Returns:

  • (true, false) —

    If the metadata cascades.

Since:

  • 2.1.0



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# File 'lib/mongoid/relations/metadata.rb', line 191

def dependent?
  !!dependent
end

#destructive? ⇒ true, false

Does the relation have a destructive dependent option specified. This is true for :dependent => :delete and :dependent => :destroy.

Examples:

Is the relation destructive?

metadata.destructive?

Returns:

  • (true, false) —

    If the relation is destructive.

Since:

  • 2.1.0



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# File 'lib/mongoid/relations/metadata.rb', line 595

def destructive?
  @destructive ||= (dependent == :delete || dependent == :destroy)
end

#eager_load(ids) ⇒ Criteria

Get the criteria needed to eager load this relation.

Examples:

Get the eager loading criteria.

metadata.eager_load(criteria)

Parameters:

  • ids (Array<Object>) —

    The ids of the returned parents.

Returns:

  • (Criteria) —

    The eager loading criteria.

Since:

  • 2.2.0



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# File 'lib/mongoid/relations/metadata.rb', line 205

def eager_load(ids)
  relation.eager_load(self, ids)
end

#embedded? ⇒ true, false

Will determine if the relation is an embedded one or not. Currently only checks against embeds one and many.

Examples:

Is the document embedded.

metadata.embedded?

Returns:

  • (true, false) —

    True if embedded, false if not.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/metadata.rb', line 218

def embedded?
  @embedded ||= (macro == :embeds_one || macro == :embeds_many)
end

#extension ⇒ Module

Returns the extension of the relation.

Examples:

Get the relation extension.

metadata.extension

Returns:

  • (Module) —

    The extension or nil.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/metadata.rb', line 230

def extension
  self[:extend]
end

#extension? ⇒ true, false

Tells whether an extension definition exist for this relation.

Examples:

Is an extension defined?

metadata.extension?

Returns:

  • (true, false) —

    True if an extension exists, false if not.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/metadata.rb', line 242

def extension?
  !!extension
end

#forced_nil_inverse? ⇒ true, false

Does this metadata have a forced nil inverse_of defined. (Used in many to manies)

Examples:

Is this a forced nil inverse?

metadata.forced_nil_inverse?

Returns:

  • (true, false) —

    If inverse_of has been explicitly set to nil.

Since:

  • 2.3.3



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

def forced_nil_inverse?
  has_key?(:inverse_of) && inverse_of.nil?
end

#foreign_key ⇒ String

Handles all the logic for figuring out what the foreign_key is for each relations query. The logic is as follows:

  1. If the developer defined a custom key, use that.

  2. If the relation stores a foreign key, use the class_name_id strategy.

  3. If the relation does not store the key, use the inverse_class_name_id strategy.

Examples:

Get the foreign key.

metadata.foreign_key

Returns:

  • (String) —

    The foreign key for the relation.

Since:

  • 2.0.0.rc.1



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

def foreign_key
  @foreign_key ||= determine_foreign_key
end

#foreign_key_check ⇒ String

Get the name of the method to check if the foreign key has changed.

Examples:

Get the foreign key check method.

metadata.foreign_key_check

Returns:

  • (String) —

    The foreign key check.

Since:

  • 2.1.0



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# File 'lib/mongoid/relations/metadata.rb', line 286

def foreign_key_check
  @foreign_key_check ||= "#{foreign_key}_changed?"
end

#foreign_key_setter ⇒ String

Returns the name of the method used to set the foreign key on a document.

Examples:

Get the setter for the foreign key.

metadata.foreign_key_setter

Returns:

  • (String) —

    The foreign_key plus =.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/metadata.rb', line 299

def foreign_key_setter
  @foreign_key_setter ||= "#{foreign_key}="
end

#index ⇒ true, false

Returns the index option of the relation.

Examples:

Get the index option.

metadata.index

Returns:

  • (true, false) —

    The index option.

Since:

  • 2.1.0



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# File 'lib/mongoid/relations/metadata.rb', line 311

def index
  self[:index]
end

#indexed? ⇒ true, false

Tells whether a foreign key index exists on the relation.

Examples:

Is the key indexed?

metadata.indexed?

Returns:

  • (true, false) —

    True if an index exists, false if not.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/metadata.rb', line 323

def indexed?
  !!index
end

#inspect ⇒ String

Since a lot of the information from the metadata is inferred and not explicitly stored in the hash, the inspection needs to be much more detailed.

Examples:

Inspect the metadata.

metadata.inspect

Returns:

  • (String) —

    Oodles of information in a nice format.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/metadata.rb', line 350

def inspect
  "#<Mongoid::Relations::Metadata\n" <<
  "  class_name:           #{class_name},\n" <<
  "  cyclic:               #{cyclic || "No"},\n" <<
  "  dependent:            #{dependent || "None"},\n" <<
  "  inverse_of:           #{inverse_of || "N/A"},\n" <<
  "  key:                  #{key},\n" <<
  "  macro:                #{macro},\n" <<
  "  name:                 #{name},\n" <<
  "  order:                #{order.inspect || "No"},\n" <<
  "  polymorphic:          #{polymorphic? || "No"},\n" <<
  "  relation:             #{relation},\n" <<
  "  setter:               #{setter},\n" <<
  "  versioned:            #{versioned? || "No"}>\n"
end

#inverse(other = nil) ⇒ Symbol

Get the name of the inverse relation if it exists. If this is a polymorphic relation then just return the :as option that was defined.

Examples:

Get the name of the inverse.

metadata.inverse

Parameters:

  • other (Document) (defaults to: nil) —

    The document to aid in the discovery.

Returns:

  • (Symbol) —

    The inverse name.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/metadata.rb', line 377

def inverse(other = nil)
  return self[:inverse_of] if has_key?(:inverse_of)
  return self[:as] || lookup_inverse(other) if polymorphic?
  @inverse ||= (cyclic? ? cyclic_inverse : inverse_relation)
end

#inverse_class_name ⇒ true, false

Returns the inverse_class_name option of the relation.

Examples:

Get the inverse_class_name option.

metadata.inverse_class_name

Returns:

  • (true, false) —

    The inverse_class_name option.

Since:

  • 2.1.0



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# File 'lib/mongoid/relations/metadata.rb', line 391

def inverse_class_name
  self[:inverse_class_name]
end

#inverse_class_name? ⇒ true, false

Returns the if the inverse class name option exists.

Examples:

Is an inverse class name defined?

metadata.inverse_class_name?

Returns:

  • (true, false) —

    If the inverse if defined.

Since:

  • 2.1.0



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# File 'lib/mongoid/relations/metadata.rb', line 403

def inverse_class_name?
  !!inverse_class_name
end

#inverse_foreign_key ⇒ String

Used for relational many to many only. This determines the name of the foreign key field on the inverse side of the relation, since in this case there are keys on both sides.

Examples:

Find the inverse foreign key

metadata.inverse_foreign_key

Returns:

  • (String) —

    The foreign key on the inverse.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/metadata.rb', line 417

def inverse_foreign_key
  @inverse_foreign_key ||= determine_inverse_foreign_key
end

#inverse_klass ⇒ Class

Returns the inverse class of the proxied relation.

Examples:

Get the inverse class.

metadata.inverse_klass

Returns:

  • (Class) —

    The class of the inverse of the relation.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/metadata.rb', line 429

def inverse_klass
  @inverse_klass ||= inverse_class_name.constantize
end

#inverse_metadata(document) ⇒ Metadata

Get the metadata for the inverse relation.

Examples:

Get the inverse metadata.

metadata.inverse_metadata(doc)

Parameters:

  • document (Document) —

    The document to check.

Returns:

Since:

  • 2.1.0



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# File 'lib/mongoid/relations/metadata.rb', line 443

def inverse_metadata(document)
  document.reflect_on_association(inverse(document))
end

#inverse_of ⇒ true, false

Returns the inverse_of option of the relation.

Examples:

Get the inverse_of option.

metadata.inverse_of

Returns:

  • (true, false) —

    The inverse_of option.

Since:

  • 2.1.0



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# File 'lib/mongoid/relations/metadata.rb', line 455

def inverse_of
  self[:inverse_of]
end

#inverse_of? ⇒ true, false

Does the metadata have a inverse_of option?

Examples:

Is an inverse_of defined?

metadata.inverse_of?

Returns:

  • (true, false) —

    If the relation has an inverse_of defined.

Since:

  • 2.1.0



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# File 'lib/mongoid/relations/metadata.rb', line 467

def inverse_of?
  !!inverse_of
end

#inverse_setter(other = nil) ⇒ String

Returns the setter for the inverse side of the relation.

Examples:

Get the inverse setter.

metadata.inverse_setter

Parameters:

  • other (Document) (defaults to: nil) —

    A document to aid in the discovery.

Returns:

  • (String) —

    The inverse setter name.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/metadata.rb', line 481

def inverse_setter(other = nil)
  "#{inverse(other)}="
end

#inverse_type ⇒ String

Returns the name of the field in which to store the name of the class for the polymorphic relation.

Examples:

Get the name of the field.

metadata.inverse_type

Returns:

  • (String) —

    The name of the field for storing the type.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/metadata.rb', line 494

def inverse_type
  @inverse_type ||=
    relation.stores_foreign_key? && polymorphic? ? "#{name}_type" : nil
end

#inverse_type_setter ⇒ String

Gets the setter for the field that sets the type of document on a polymorphic relation.

Examples:

Get the inverse type setter.

metadata.inverse_type_setter

Returns:

  • (String) —

    The name of the setter.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/metadata.rb', line 508

def inverse_type_setter
  @inverse_type_setter ||= inverse_type ? "#{inverse_type}=" : nil
end

#key ⇒ String

This returns the key that is to be used to grab the attributes for the relation or the foreign key or id that a referenced relation will use to query for the object.

Examples:

Get the lookup key.

metadata.key

Returns:

  • (String) —

    The association name, foreign key name, or _id.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/metadata.rb', line 522

def key
  @key ||= determine_key
end

#klass ⇒ Class

Returns the class of the proxied relation.

Examples:

Get the class.

metadata.klass

Returns:

  • (Class) —

    The class of the relation.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/metadata.rb', line 534

def klass
  @klass ||= class_name.constantize
end

#macro ⇒ Symbol

Returns the macro for the relation of this metadata.

Examples:

Get the macro.

metadata.macro

Returns:

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/metadata.rb', line 558

def macro
  relation.macro
end

#many? ⇒ true, false

Is this metadata representing a one to many or many to many relation?

Examples:

Is the relation a many?

metadata.many?

Returns:

  • (true, false) —

    If the relation is a many.

Since:

  • 2.1.6



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# File 'lib/mongoid/relations/metadata.rb', line 546

def many?
  @many ||= (relation.macro.to_s =~ /many/)
end

#name ⇒ Symbol

Get the name associated with this metadata.

Examples:

Get the name.

metadata.name

Returns:

Since:

  • 2.1.0



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# File 'lib/mongoid/relations/metadata.rb', line 570

def name
  self[:name]
end

#name? ⇒ true, false

Is the name defined?

Examples:

Is the name defined?

metadata.name?

Returns:

  • (true, false) —

    If the name is defined.

Since:

  • 2.1.0



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# File 'lib/mongoid/relations/metadata.rb', line 582

def name?
  !!name
end

#nested_builder(attributes, options) ⇒ NestedBuilder

Gets a relation nested builder associated with the relation this metadata is for. Nested builders are used in conjunction with nested attributes.

Examples:

Get the nested builder.

metadata.nested_builder(attributes, options)

Parameters:

  • attributes (Hash) —

    The attributes to build the relation with.

  • options (Hash) —

    Options for the nested builder.

Returns:

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/metadata.rb', line 611

def nested_builder(attributes, options)
  relation.nested_builder(self, attributes, options)
end

#order ⇒ Criterion::Complex?

Returns default order for this association.

Examples:

Get default order

metadata.order

Returns:

Since:

  • 2.1.0



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# File 'lib/mongoid/relations/metadata.rb', line 728

def order
  self[:order]
end

#order? ⇒ true, false

Is a default order set?

Examples:

Is the order set?

metadata.order?

Returns:

  • (true, false) —

    If the order is set.

Since:

  • 2.1.0



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# File 'lib/mongoid/relations/metadata.rb', line 740

def order?
  !!order
end

#path(document) ⇒ Object

Get the path calculator for the supplied document.

Examples:

Get the path calculator.

metadata.path(document)

Parameters:

  • document (Document) —

    The document to calculate on.

Returns:

  • (Object) —

    The atomic path calculator.

Since:

  • 2.1.0



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# File 'lib/mongoid/relations/metadata.rb', line 625

def path(document)
  relation.path(document)
end

#polymorphic? ⇒ true, false

Returns true if the relation is polymorphic.

Examples:

Is the relation polymorphic?

metadata.polymorphic?

Returns:

  • (true, false) —

    True if the relation is polymorphic, false if not.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/metadata.rb', line 637

def polymorphic?
  @polymorphic ||= (!!self[:as] || !!self[:polymorphic])
end

#relation ⇒ Proxy

Get the relation associated with this metadata.

Examples:

Get the relation.

metadata.relation

Returns:

  • (Proxy) —

    The relation proxy class.

Since:

  • 2.1.0



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# File 'lib/mongoid/relations/metadata.rb', line 649

def relation
  self[:relation]
end

#setter ⇒ String

Gets the method name used to set this relation.

Examples:

Get the setter.

metadata = Metadata.new(:name => :person)
metadata.setter # => "person="

Returns:

  • (String) —

    The name plus “=”.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/metadata.rb', line 662

def setter
  @setter ||= "#{name.to_s}="
end

#type ⇒ String

Returns the name of the field in which to store the name of the class for the polymorphic relation.

Examples:

Get the name of the field.

metadata.inverse_type

Returns:

  • (String) —

    The name of the field for storing the type.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/metadata.rb', line 675

def type
  @type ||= polymorphic? ? "#{as.to_s}_type" : nil
end

#type_setter ⇒ String

Gets the setter for the field that sets the type of document on a polymorphic relation.

Examples:

Get the inverse type setter.

metadata.inverse_type_setter

Returns:

  • (String) —

    The name of the setter.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/metadata.rb', line 688

def type_setter
  @type_setter ||= type ? "#{type}=" : nil
end

#validate? ⇒ true, false

Are we validating this relation automatically?

Examples:

Is automatic validation on?

metadata.validate?

Returns:

  • (true, false) —

    True unless explictly set to false.

Since:

  • 2.0.0.rc.1



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# File 'lib/mongoid/relations/metadata.rb', line 700

def validate?
  unless self[:validate].nil?
    self[:validate]
  else
    self[:validate] = relation.validation_default
  end
end

#versioned? ⇒ true, false

Is this relation using Mongoid’s internal versioning system?

Examples:

Is this relation versioned?

metadata.versioned?

Returns:

  • (true, false) —

    If the relation uses Mongoid versioning.

Since:

  • 2.1.0



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# File 'lib/mongoid/relations/metadata.rb', line 716

def versioned?
  !!self[:versioned]
end