Module: Mongoid::Fields::ClassMethods

Defined in:
lib/mongoid/fields.rb,
lib/mongoid/fields.rb

Instance Method Summary collapse

Instance Method Details

#attribute_names ⇒ Array<String>

Returns an array of names for the attributes available on this object.

Provides the field names in an ORM-agnostic way. Rails v3.1+ uses this method to automatically wrap params in JSON requests.

Examples:

Get the field names

Model.attribute_names



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# File 'lib/mongoid/fields.rb', line 454

def attribute_names
  fields.keys
end

#cleanse_localized_field_names(name) ⇒ Field

Removes the _translations from the given field name. This is done only when there doesn’t already exist a field name or relation with the same name (i.e. with the _translations suffix). This check for an existing field is done recursively



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# File 'lib/mongoid/fields.rb', line 100

def cleanse_localized_field_names(name)
  name = database_field_name(name.to_s)

  klass = self
  [].tap do |res|
    ar = name.split('.')
    ar.each_with_index do |fn, i|
      key = fn
      unless klass.fields.key?(fn) || klass.relations.key?(fn)
        if fn.end_with?(TRANSLATIONS_SFX)
          key = fn.delete_suffix(TRANSLATIONS_SFX)
        else
          key = fn
        end

      end
      res.push(key)

      if klass.fields.key?(fn)
        res.push(ar.drop(i+1).join('.')) unless i == ar.length - 1
        break
      elsif klass.relations.key?(fn)
        klass = klass.relations[key].klass
      end
    end
  end.join('.')
end

#database_field_name(name) ⇒ String

Get the name of the provided field as it is stored in the database. Used in determining if the field is aliased or not.



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# File 'lib/mongoid/fields.rb', line 464

def database_field_name(name)
  Fields.database_field_name(name, relations, aliased_fields, aliased_associations)
end

#extract_id_field(attributes) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Extracts the id field from the specified attributes hash based on aliases defined in this class.



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# File 'lib/mongoid/fields.rb', line 83

def extract_id_field(attributes)
  id_fields.each do |k|
    if v = attributes[k]
      return v
    end
  end
  nil
end

#field(name, options = {}) ⇒ Field

Defines all the fields that are accessible on the Document For each field that is defined, a getter and setter will be added as an instance method to the Document.

Examples:

Define a field.

field :score, type: Integer, default: 0

Options Hash (options):

  • :type (Class | Symbol | String) —

    The type of the field.

  • :label (String) —

    The label for the field.

  • :default (Object | Proc) —

    The field’s default.



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# File 'lib/mongoid/fields.rb', line 483

def field(name, options = {})
  named = name.to_s
  Validators::Macro.validate(self, name, options)
  added = add_field(named, options)
  descendants.each do |subclass|
    subclass.add_field(named, options)
  end
  added
end

#id_fields ⇒ Array<Symbol | String>

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns the list of id fields for this model class, as both strings and symbols.



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# File 'lib/mongoid/fields.rb', line 64

def id_fields
  IDS.dup.tap do |id_fields|
    aliased_fields.each do |k, v|
      if v == '_id'
        id_fields << k.to_sym
        id_fields << k
      end
    end
  end
end

#replace_field(name, type) ⇒ Serializable

Replace a field with a new type.

Examples:

Replace the field.

Model.replace_field("_id", String)



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# File 'lib/mongoid/fields.rb', line 502

def replace_field(name, type)
  remove_defaults(name)
  add_field(name, fields[name].options.merge(type: type))
end

#traverse_association_tree(key) {|The, The, Whether| ... } ⇒ Field

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Traverse down the association tree and search for the field for the given key.

Yield Parameters:

  • The (Symbol) —

    current method.

  • The (Symbol | String) —

    field or the relation.

  • Whether (true | false) —

    the second yield parameter is a field or not.



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# File 'lib/mongoid/fields.rb', line 533

def traverse_association_tree(key, &block)
  Fields.traverse_association_tree(key, fields, relations, aliased_associations, &block)
end

#using_object_ids? ⇒ true | false

Convenience method for determining if we are using BSON::ObjectIds as our id.

Examples:

Does this class use object ids?

person.using_object_ids?



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# File 'lib/mongoid/fields.rb', line 514

def using_object_ids?
  fields["_id"].object_id_field?
end