How do you access params[:model][:field] in Rails 4? -

from understand...

• if have form_for @model, params[:model] available when form submitted. furthermore, if form has 2 attributes attr1 , attr2, params[:model][:attr1] , params[:model][:attr2] available when form submitted.
• in rails 4, you're supposed write method model_params says params.require(:model).permit(:attr1, :attr2).
• you'd use model_params so: model.new(model_params).

however, do if need 1 of fields form? if needed params[:model][:attr1]?

example:

def create   @user = user.new(user_params)   if @user.save     # need access params[:user][:password] here     redirect_to root_url, :notice => "signed up!"   else     render :new   end end  private      def user_params         params.require(:user).permit(:email, :password, :password_confirmation)     end 

the gem responsible behaviour strong_parameters. permit() method decides pass on model based on attributes pass it.

in case, passed :attr1 , :attr2:

params.require(:model).permit(:attr1, :attr2) 

this means model have attr1 , attr2 set whatever values passed form.

if wanted set attr1, remove attr2 permit() call.

params.require(:model).permit(:attr1) 

you model not have attr1 set, not attr2. it's simple.

you can permit (not recommended) calling permit! bang , no arguments.

you can read more behaviour on the gem's github project page.

update based on op's edit

if need access params[:user][:password] in controller... well, accessed in example. accessed typing params[:user][:password].

nothing prevents accessing params hash directly. strong_parameter's job prevent mass assigning hash model, that's all.