module Mongoid::Attributes
This module contains the logic for handling the internal attributes hash, and how to get and set values.
Attributes
Public Instance Methods
Allows you to set all the attributes for a particular mass-assignment security role by passing in a hash of attributes with keys matching the attribute names (which again matches the column names) and the role name using the :as option. To bypass mass-assignment security you can use the :without_protection => true option.
@example Assign the attributes.
person.assign_attributes(:title => "Mr.")
@example Assign the attributes (with a role).
person.assign_attributes({ :title => "Mr." }, :as => :admin)
@param [ Hash ] attrs The new attributes to set.
# File lib/mongoid/attributes.rb, line 218 def assign_attributes(attrs = nil) _assigning do process_attributes(attrs) end end
Determine if the attribute is missing from the document, due to loading it from the database with missing fields.
@example Is the attribute missing?
document.attribute_missing?("test")
@param [ String ] name The name of the attribute.
@return [ true | false ] If the attribute is missing.
# File lib/mongoid/attributes.rb, line 249 def attribute_missing?(name) !Projector.new(__selected_fields).attribute_or_path_allowed?(name) end
Determine if an attribute is present.
@example Is the attribute present?
person.attribute_present?("title")
@param [ String | Symbol ] name The name of the attribute.
@return [ true | false ] True if present, false if not.
# File lib/mongoid/attributes.rb, line 33 def attribute_present?(name) attribute = read_raw_attribute(name) !attribute.blank? || attribute == false rescue Mongoid::Errors::AttributeNotLoaded false end
Get the attributes that have not been cast.
@example Get the attributes before type cast.
document.attributes_before_type_cast
@return [ Hash ] The uncast attributes.
# File lib/mongoid/attributes.rb, line 46 def attributes_before_type_cast @attributes_before_type_cast ||= {} end
Does the document have the provided attribute?
@example Does the document have the attribute?
model.has_attribute?(:name)
@param [ String | Symbol ] name The name of the attribute.
@return [ true | false ] If the key is present in the attributes.
# File lib/mongoid/attributes.rb, line 58 def has_attribute?(name) attributes.key?(name.to_s) end
Does the document have the provided attribute before it was assigned and type cast?
@example Does the document have the attribute before it was assigned?
model.has_attribute_before_type_cast?(:name)
@param [ String | Symbol ] name The name of the attribute.
@return [ true | false ] If the key is present in the
attributes_before_type_cast.
# File lib/mongoid/attributes.rb, line 72 def has_attribute_before_type_cast?(name) attributes_before_type_cast.key?(name.to_s) end
Process the raw attribute values just read from the documents attributes.
@param [ String ] name The name of the attribute to get. @param [ Object
] raw The raw attribute value. @param [ Field | nil ] field The field to use for demongoization or nil.
@return [ Object
] The value of the attribute.
@api private
# File lib/mongoid/attributes.rb, line 105 def process_raw_attribute(name, raw, field) value = field ? field.demongoize(raw) : raw attribute_will_change!(name) if value.resizable? value end
Read a value from the document attributes. If the value does not exist it will return nil.
@example Read an attribute.
person.read_attribute(:title)
@example Read an attribute (alternate syntax.)
person[:title]
@param [ String | Symbol ] name The name of the attribute to get.
@return [ Object
] The value of the attribute.
# File lib/mongoid/attributes.rb, line 88 def read_attribute(name) field = fields[name.to_s] raw = read_raw_attribute(name) process_raw_attribute(name.to_s, raw, field) end
Read a value from the attributes before type cast. If the value has not yet been assigned then this will return the attribute’s existing value using read_raw_attribute.
@example Read an attribute before type cast.
person.read_attribute_before_type_cast(:price)
@param [ String | Symbol ] name The name of the attribute to get.
@return [ Object
] The value of the attribute before type cast, if
available. Otherwise, the value of the attribute.
# File lib/mongoid/attributes.rb, line 122 def read_attribute_before_type_cast(name) attr = name.to_s if attributes_before_type_cast.key?(attr) attributes_before_type_cast[attr] else read_raw_attribute(attr) end end
Remove a value from the Document
attributes. If the value does not exist it will fail gracefully.
@example Remove the attribute.
person.remove_attribute(:title)
@param [ String | Symbol ] name The name of the attribute to remove.
@raise [ Errors::ReadonlyAttribute
] If the field cannot be removed due
to being flagged as reaodnly.
# File lib/mongoid/attributes.rb, line 141 def remove_attribute(name) validate_writable_field_name!(name.to_s) as_writable_attribute!(name) do |access| _assigning do attribute_will_change!(access) delayed_atomic_unsets[atomic_attribute_name(access)] = [] unless new_record? attributes.delete(access) end end end
Return type-casted attributes.
@example Type-casted attributes.
document.typed_attributes
@return [ Object
] The hash with keys and values of the type-casted attributes.
# File lib/mongoid/attributes.rb, line 259 def typed_attributes attribute_names.map { |name| [name, send(name)] }.to_h end
Write a single attribute to the document attribute hash. This will also fire the before and after update callbacks, and perform any necessary typecasting.
@example Write the attribute.
person.write_attribute(:title, "Mr.")
@example Write the attribute (alternate syntax.)
person[:title] = "Mr."
@param [ String | Symbol ] name The name of the attribute to update. @param [ Object
] value The value to set for the attribute.
# File lib/mongoid/attributes.rb, line 164 def write_attribute(name, value) validate_writable_field_name!(name.to_s) field_name = database_field_name(name) if attribute_missing?(field_name) raise Mongoid::Errors::AttributeNotLoaded.new(self.class, field_name) end if attribute_writable?(field_name) _assigning do localized = fields[field_name].try(:localized?) attributes_before_type_cast[name.to_s] = value typed_value = typed_value_for(field_name, value) unless attributes[field_name] == typed_value || attribute_changed?(field_name) attribute_will_change!(field_name) end if localized present = fields[field_name].try(:localize_present?) loc_key, loc_val = typed_value.first if present && loc_val.blank? attributes[field_name]&.delete(loc_key) else attributes[field_name] ||= {} attributes[field_name].merge!(typed_value) end else attributes[field_name] = typed_value end # when writing an attribute, also remove it from the unsets, # so that removing then writing doesn't result in a removal. delayed_atomic_unsets.delete(field_name) typed_value end else # TODO: MONGOID-5072 end end
Writes the supplied attributes hash to the document. This will only overwrite existing attributes if they are present in the new Hash
, all others will be preserved.
@example Write the attributes.
person.write_attributes(:title => "Mr.")
@example Write the attributes (alternate syntax.)
person.attributes = { :title => "Mr." }
@param [ Hash ] attrs The new attributes to set.
# File lib/mongoid/attributes.rb, line 235 def write_attributes(attrs = nil) assign_attributes(attrs) end
Private Instance Methods
Does the string contain dot syntax for accessing hashes?
@api private
@example Is the string in dot syntax.
model.hash_dot_syntax?
@return [ true | false ] If the string contains a “.”
# File lib/mongoid/attributes.rb, line 273 def hash_dot_syntax?(string) string.include?(".") end
# File lib/mongoid/attributes.rb, line 363 def lookup_attribute_presence(name, value) if localized_fields.has_key?(name) && value value = localized_fields[name].send(:lookup, value) end value.present? end
# File lib/mongoid/attributes.rb, line 292 def read_raw_attribute(name) normalized = database_field_name(name.to_s) if attribute_missing?(normalized) raise Mongoid::Errors::AttributeNotLoaded.new(self.class, name) end if hash_dot_syntax?(normalized) if fields.key?(normalized) attributes[normalized] else Embedded.traverse(attributes, normalized) end else attributes[normalized] end end
Return the typecasted value for a field.
@example Get the value typecasted.
person.typed_value_for(:title, :sir)
@param [ String | Symbol ] key The field name. @param [ Object
] value The uncast value.
@return [ Object
] The cast value.
# File lib/mongoid/attributes.rb, line 286 def typed_value_for(key, value) fields.key?(key) ? fields[key].mongoize(value) : value.mongoize end