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I have a namespaced resource in my Rails 5 app and want the correct form for it.
My scaffold for Platform in Rails 5 gave me:
<%= form_with(model: platform, local: true ) do |form| %>
In Rails 4 I would include my namespace ('customer') like:
<%= form_for [:customer, @platform] do |f| %>
So what is the equivalent in Rails 5?
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Another difference between form_with compared to form_for and form_tag is that form_for and form_tag generate automatic ids for the input fields. On the other hand, form_with does not. Ids and classes have to be specified. This isn't necessarily considered to be a bad thing.
This is the name used to generate the input's name (and the params' names), example: = form_for Admin.new, as: :user do |f| #^^^^ = f.input :username # will generate an input like this: <input type='text' name='user[username]' #... /> #
The form_tag Rails helper generates a form withe the POST method by default, and it automatically renders the HTML that we were writing by hand before. Note: We can explicitly specify what HTTP verb to use for the form_tag if we want something other than POST .
In your form you would do something like this.
<%= form_for [@customer, @platform] do |form| %>
...
<% end %>
In new.html.erb or equivilent new method:
<%= render 'form', customer: @customer %>
In your new controller method (depending on your relationships)
def new
@customer = @platform.customers.build
end
Using form_with
<%= form_with(model: [:customer, @platform]) do |form| %>
...
<% end %>
http://api.rubyonrails.org/v5.1/classes/ActionView/Helpers/FormHelper.html#method-i-form_with
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