在rails 3.1.0中，params [：controller_name] [：field1]和params [：field1]是否相同？

Question

For create in a controller, the data is passed into the controller in params[:controller_name] (controller_name could be article or product for example) We can use params[:field1] to access the field1 data(WRONG!). We know the data is passed in as controller_name -> {field1 = A, field2 = B ...} . Is params[:controller_name][:field1] the same as params[:field1] ?

Can anyone explain? Thanks.

Answer 1

I think controller_name is a reserved param that always holds the name of the controller so that could explain any weird behavior you are seeing. Try using :cname or something like that instead.

Answer 2

The answer is: the right way to retrieve a field from params is params[:controller_name][:field_name] , the controller_name here could be for example, product or article.

params[:field_name] only returns nothing in our test.