method

attributes=

v3.0.0 - Show latest stable - 3 notes - Class: ActiveRecord::Base

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What's this?

attributes=(new_attributes, guard_protected_attributes = true) public

Allows you to set all the attributes at once by passing in a hash with keys matching the attribute names (which again matches the column names).

If guard_protected_attributes is true (the default), then sensitive attributes can be protected from this form of mass-assignment by using the attr_protected macro. Or you can alternatively specify which attributes can be accessed with the attr_accessible macro. Then all the attributes not included in that won’t be allowed to be mass-assigned.

  class User < ActiveRecord::Base
    attr_protected :is_admin
  end

  user = User.new
  user.attributes = { :username => 'Phusion', :is_admin => true }
  user.username   # => "Phusion"
  user.is_admin?  # => false

  user.send(:attributes=, { :username => 'Phusion', :is_admin => true }, false)
  user.is_admin?  # => true

Show source

# File activerecord/lib/active_record/base.rb, line 1539
      def attributes=(new_attributes, guard_protected_attributes = true)
        return unless new_attributes.is_a?(Hash)
        attributes = new_attributes.stringify_keys

        multi_parameter_attributes = []
        attributes = sanitize_for_mass_assignment(attributes) if guard_protected_attributes

        attributes.each do |k, v|
          if k.include?("(")
            multi_parameter_attributes << [ k, v ]
          else
            respond_to?("#{k}=""#{k}=") ? send("#{k}=""#{k}=", v) : raise(UnknownAttributeError, "unknown attribute: #{k}")
          end
        end

        assign_multiparameter_attributes(multi_parameter_attributes)
      end

October 1, 2009

0 thanks

Update attributes on mulitple models

Updates attributes on multiple models, saves each if validations pass.

def update_multiple

  @items = Item.find(params[:item_ids])
  @items.each do |item|
    item.attributes = params[:item].reject { |k,v| v.blank? }
  end
  if @items.all?(&:valid?)
    @items.each(&:save!)
    flash[:notice] = "Updated items!"
    redirect_to items_path
  else
    flash[:notice] = "Please enter valid data."
    render :action => 'edit_multiple'
  end
end

October 26, 2010 - (>= v3.0.0)

0 thanks

Use super to override, and not alias_method_chain

Somehow, If you want to extend the behaviour of attributes=,

alias_method_chain does not work. It simply breaks (could not find out how exactly).

def attributes_with_some_feature=(new_attributes, guard_protected_attributes = true)
  attributes_without_some_feature=(new_attributes, guard_protected_attributes)
end
alias_method_chain :attributes=, :some_feature

this breaks the code. dynamic finders and assignments didn’t work as before (Even though no behaviour has changed yet).

Instead,

def attributes=(new_attributes, guard_protected_attributes = true)
  # custom code
  super(new_attributes, guard_protected_attributes)
end

does work as expected.

I prefer using alias_method_chain for breaking open existing functionality, but in this case it won’t work.

April 6, 2011

0 thanks

the source is wrong!

in 3.0.5, the source code in line 15 looks like this:

respond_to?(:"#{k}=") ? send(:"#{k}=", v) : raise(UnknownAttributeError, "unknown attribute: #{k}")

whats wrong with apidock?

attributes=

Related methods

Update attributes on mulitple models

def update_multiple

Use super to override, and not alias_method_chain

the source is wrong!