How I can set 'attr_accessible' in order to NOT allow access to ANY of the fields FOR a model using Ruby on Rails?

Question

If in a model file I have just this code:

class Users < ActiveRecord::Base
end

what this means? All attributes related to the model are acce

Answer 1

I prefer to be more explicit in the denial for one model:

class Users < ActiveRecord::Base
  attr_accessible nil
end

The result is the same as attr_accessible with no params, but makes your intent more clear. This will reduce the likelihood that a future programmer (e.g. yourself!) will delete the line...or start adding fields to attr_accessible.

This appeases Brakeman and other vulnerability-sniffing tools.

Answer 2

Beginning with Rails 3.1, the following configuration option is available to disable mass-assignment by default for all models until you explicitly call attr_accessible or attr_protected:

config.active_record.whitelist_attributes = true

See http://edgeguides.rubyonrails.org/security.html#mass-assignment and https://github.com/rails/rails/commit/f3b9d3aba8cc0ffaca2da1c73c4ba96de2066760

Answer 3

By default the attributes are all attr_accessible (which means they can be set my mass-assignment).

• attr_accessible - only this list of attributes can be set by mass-assignment (white-listing).
• attr_protected - these attributes cannot be set by mass-assignment (black-listing).
• attr_readonly - these attributes cannot be set except for when the record is created.

To disable mass-assignment entirely, use something like this:

ActiveRecord::Base.send(:attr_accessible, nil)

This command will disable mass-assignment for all active record objects, but you can specify one or more models to perform this command on if you want mass-assignment in some cases but not in others.

Answer 4

Just set:

class Users < ActiveRecord::Base
  attr_accessible #none
end

Like Pan Thomakos said (attr_accessible is the array of parameters that can be mass-ret. So if you send in no symbols, then no parameters will be accessible.

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