Ruby on Rails latest stable (v4.2.7) - 3 notes - Class: ActiveRecord::Base

Method deprecated or moved

This method is deprecated or moved on the latest stable version. The last existing version (v3.1.0) is shown here.

These similar methods exist in v4.2.7:

attributes() public

Returns a hash of all the attributes with their names as keys and the values of the attributes as values.

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December 28, 2009
4 thanks

Attribute names are Strings, not Symbols

Another possible gotcha – the returned hash keys are of type String, not Symbol:

user.attributes["login"] # => "joe"
user.attributes[:login] # => nil
June 18, 2009
3 thanks

Expensive method!

This method builds the a new hash every time it’s called, so be cautious not to use it in loops etc.

June 25, 2009
1 thank

Returns a copy of the attribute contents

As szeryf notes, this is a really expensive method, but another important remark is that the contents returned are a copy of the actual values.

model.attributes['name'] # => 'Joe'
model.attributes['name'] = 'Jim'
model.attributes['name'] # => 'Joe' still
model.name # => 'Joe'

This has the potential to be confusing as you’re given the impression you have direct access to the attributes.