Access to a param in another controller sended by render :template - ruby-on-rails

Question

So im sending a param from a view to a view of another controller
<%= render template: 'dishes/new', :id => #restaurant.id %>
and this is my other controller view:
def new
#dish = Dish.new
#id = params[:id]
end
def create
#dish = Dish.new(dish_params)
respond_to do |format|
if #dish.save
format.html { redirect_to #restaurant, notice: 'dish was successfully created.' }
format.json { render action: 'show', status: :created, location: :restaurant }
else
format.html { render action: 'show', location: :restaurant }
format.json { render json: #restaurant.errors, status: :unprocessable_entity }
end
end
end
private
def dish_params
params.require(:dish).permit( :avatar, :name, :description, [:id])
end
and this is my view who calls the form:
#new.html.erb
<h1>Add a new dish</h1>
<%= render 'dishes/dish_form' %>
then here is the form:
<%= form_for #dish, :url => { :controller => "dishes", action_name => "create" } do |f| %>
<div class="field">
<%= f.label :dish_name %>
<%= f.text_field :name %>
</div>
<div class="field">
<%= f.label :description %>
<%= f.text_field :description %>
</div>
<div class="field">
<%= f.label :image %>
<%= f.file_field :avatar %>
</div>
<div class="actions">
<%= f.submit 'Add new dish' %>
</div>
<% end %>
but when i try to save it i got this error:

Answer 1

I think your problem comes in when you are expecting your render template: 'dishes/new' to hit your DishesController. That is not what is happening when you are calling the render.
What you're doing is telling rails to load into your current view the template for 'dishes/new', and you're passing 'dishes/new' a variable that it can access when rendering. You aren't sending a param to a controller.
If you want to keep the current set up you have right now, you can make it work with some tweaking.
I'm going to assume that your Dish model belongs to Restaurant, and therefore has restaurant_id as a column. If that is true, then you can add a hidden field to your form for dishes, called restaurant_id, and update your permitted params in your controller to allow the restaurant id to be set on the dish.
Your form would look like this:
<%= form_for #dish, :url => { :controller => "dishes", action_name => "create" } do |f| %>
<%= f.hidden_field :restaurant_id, value: id %>
...
<% end %>
Your permitted params in your controller would look like this:
def dish_params
params.require(:dish).permit(:avatar, :name, :description, :restaurant_id)
end
You can get more information on how the rails rendering is working here

Answer 2

The error is saying that your controller named Restaurants does not have an action named "Show".
One solution would be to add the Action with the name "Show" to the restaurant controller.
The other option may be that you actually created the action you wanted, but you named it something other than "Show".