Change parameter name FORM_WITH VS FORM_FOR

Question

I am using rails 5 and the form_with helper. My code works when using Form_for, but not Form_with. Is the :as parameter not valid with Form_with?

View

<%= form_with(model: @user_wizard , :as => :user_wizard, url: validate_step_wizard_path, local: true, builder: BsFormBuilder) do |f| %>

Model

def user_wizard_params
   params.require(:user_wizard).permit( :name )
 end

However, every time I try to submit the form, the parameter submits:

{"utf8"=>"✓",
 "authenticity_token"=>"LvRDsdfsdfsd3V0l4NLg14q2JWBdwkDPqUIu2l7SXDiioCtvMwW6Bv3ss/LPSS9+bdxiPIzjg==",
 "current_step"=>"step1",
 "wizard_user_step1"=>
  {"name"=>"Name"}
}

I have been following this.. https://medium.com/@nicolasblanco/developing-a-wizard-or-multi-steps-forms-in-rails-d2f3b7c692ce

However, my code I use Form_with and they use Form_for. I don't know what the difference is.

Answer 1

Rails form_with replaced the as option with scope, which has the same functionality. Your example should look like this:

<%= form_with(model: @wizard , scope: :user_wizard) do |f| %>

Now your inputs should have names like user_wizard[attribute].

Answer 2

form_for using underlying model instance for example here @post as a model

<%= form_for @post do |form| %>
 <%= form.text_field :author %>
 <%= form.submit “Create” %>
<% end %>

form_tag is form helper but don't have underlying model and you should use text_field_tag instead of text_field

<%= form_tag “/posts” do %>
 <%= text_field_tag “post[author]” %>
 <%= submit_tag “Create” %>
<% end %>

form_with will combine form_for and form_tag and later these two will be unify with form_with

here implementation of form_for and form_tag using form_with, as you can see below the difference, if you passing form_with with a model it will work as form_for but if you passing it url then it will work as form_tag

<%= form_with model: @post do |form| %>
 <%= form.text_field :author %>
 <%= form.submit “Create” %>
<% end %>

<%= form_with url: “/posts” do |form| %>
 <%= form.text_field :author %>
 <%= form.submit “Create” %>
<% end %>

meanwhile for your problem there is no options as, you can check from this link for more detail options