Ruby on Rails | Setting Attributes

Question

Are there any other ways to set attributes for models in Rails other than using attribute=?

For example, is there something like set_attribute(name, value)?

user = User.new
user.set_attribute(:name, 'Jack')
user.set_attribute(:surname, 'The Ripper')
user.save

# instead of
user.name = 'Jack'
user.surname = 'The Ripper'

Fivell · Accepted Answer · 2012-02-11 10:12:24Z

3

looking to the AR source we can find

# File activerecord/lib/active_record/persistence.rb, line 208
def update_attributes(attributes, options = {})
  # The following transaction covers any possible database side-effects of the
  # attributes assignment. For example, setting the IDs of a child collection.
  with_transaction_returning_status do
    self.assign_attributes(attributes, options)
    save
  end
end

so you can use assign_attributes(attributes, options) to set attributes without saving

Also if you want to set attribute by name without calling a method directly you can use user.send(:name=, 'Jack') instead of user.set_attribute(:name, 'Jack')

answered Feb 11, 2012 at 10:12

Fivell

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Comments

lucapette · Accepted Answer · 2012-02-11 09:43:20Z

2

There is a write_attribute method. It should be what you're looking for.

EDIT

You can use update_attributes if you want to update many attributes at once.

edited Feb 11, 2012 at 9:43

answered Feb 11, 2012 at 8:25

lucapette

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6 Comments

Shamaoke Over a year ago

Thanks for the answer, lucapette. Is there a similar method which allows to assign several attributes at once? Something like write_attributes.

icanhazbroccoli Over a year ago

update_attributes method is available for immedeately attributes update(with saving) and here is attributes= also, which just modifying original object without saving

lucapette Over a year ago

@Shamaoke As 4pcbr has said if you want to write many attributes at once you can use update_attributes.

Shamaoke Over a year ago

According to ApiDock, attributes= is outdated. update_attributes doesn't fit well since it saves attributes and also, I think, its purpose still not to set but to update.

lucapette Over a year ago

@Shamaoke I see. So you just want to set a lot of attributes a time. Whitout persisting them?

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