ActiveRecord Create (not !) Throwing Exception on Validation

Question

So I'm using ActiveRecord model validations to validate a form in a RESTful application.

I have a create action that does:

@association = Association.new

and the receiving end of the form creates a data hash of attributes from the form parameters to save to the database using:

@association = user.associations.create(data)

I want to simply render the create action if validation fails. The problem is that the .create (not !) method is throwing an exception in cases where the model validation fails. Example:

validates_format_of :url,         :with => /(^$)|(^(http|https):\/\/[a-z0-9]+([\-\.]{1}[a-z0-9]+)*\.[a-z]{2,5}(([0-9]{1,5})?\/.*)?$)/ix, :message => "Your url doesn't seem valid."

in the model produces:

ActiveRecord::RecordInvalid Exception: Validation failed: Url Your url doesn't seem valid.

I thought .create! is supposed throw an exception whereas .create is not.

Am I missing something here?

Ruby 1.8.7 patchlevel 173 & rails 2.3.3

Tim Sullivan · Accepted Answer · 2018-02-09 16:02:43Z

15

Read the documentation of create and create! carefully.

Both create and create! check the callbacks (in your case validations). create method return false if exception is raised and true if not while, create! method raised exception if the record is invalid.

However, create can throw an ActiveRecord::RecordNotUnique if you have a unique index in the database and no validation set on the model. In this case, you should add validates :fieldname, uniqueness: true onto the model.

edited Feb 9, 2018 at 16:02

Tim Sullivan

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answered Jun 14, 2010 at 4:54

Salil

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2 Comments

onyxrev Over a year ago

How does one go about determining the false return of create when it's throwing exceptions? Does one have to handle the exception merely to find out that validation failed?

Sam Saffron Over a year ago

not entirely correct, .create can throw ActiveRecord::RecordNotUnique if you have a unique index and no validation

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