Passing params for creating and updating a model

Question

I wonder, is there an easier way to do the following

#controller's action
@my_model = MyModel.create field1: params[:field1],
               field2: params[:field2],
               field3: params[:field3],
               field4: params[:field4]
               # and so on.....

I would use

  @my_model = MyModel.create params

but would it work since params always contains other keys added by Rails?

P.S. The same question for updating a model (would this work properly?)

MyModel.update_attributes params

If it's coming from a form you should be able to pass in params[:my_model] or whatever it's sending. If you can't, that means that you're not using the Rails form/form fields, or aren't naming them properly. Either that, or you should use a form model containing only the fields you need. — Dave Newton
– Dave Newton, Commented May 30, 2013 at 16:20

user946611 · Accepted Answer · 2013-05-30 16:22:23Z

1

Send params as a nested hash like

{:my_model => {:field1 => 'blah', :field2 => 'blah'}, :controller => 'something', :action => 'something_else'}

This way you could just say

@my_model = MyModel.create params[:my_model]

Rails does this automatically if you have followed the conventions while creating the form.

answered May 30, 2013 at 16:22

user946611

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4 Comments

user946611 Over a year ago

In this case, use form helpers (form_for)

user946611 Over a year ago

guides.rubyonrails.org/getting_started.html#creating-new-posts This will be helpful.

Alan Coromano Over a year ago

if I can't use form_for, is there any way to simply my code, for example, by using reflection or something like that?

RadBrad Over a year ago

If you can't use form_for, that shouldn't prevent you from still adhering to rails conventions, i.e if you use text_field_tag, you can still arrange for the input element name to be 'my_model[field1]'

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