CODEWITHSUNDEEP
ruby-on-railsruby
user3726986
user3726986

Reputation:

Ruby on Rails Form For with two parameters

I have the following code but I am not able to understand hows does routing happen for form_for([@article, @article.comments.build]).

Title: <%= @article.title %> 

    <p>
      <strong>Text:</strong>
      <%= @article.text %>
    </p>

    <h2>Add a comment:</h2>
    <%= form_for([@article, @article.comments.build]) do |f| %>
      <p>
        <%= f.label :commenter %><br>
        <%= f.text_field :commenter %>
      </p>
      <p>
        <%= f.label :body %><br>
        <%= f.text_area :body %>
      </p>
      <p>
        <%= f.submit %>
      </p>
    <% end %>

    <%= link_to 'Back', articles_path %>
    | <%= link_to 'Edit', edit_article_path(@article) %>

Upvotes: 5

Views: 1060

Answers (2)

Doug Steinberg
Doug Steinberg

Reputation: 1162

To do that you would have to have your comments routs nested under your article. So your rout file would have something like this

resources :article
  resources :comments
end

This creates several routes, the one this form would go it is

POST  /posts/:post_id/comments

And in the form_for helper form_for([@article, @article.comments.build]) tells the form to post to that rout

Upvotes: 2

sonnyhe2002
sonnyhe2002

Reputation: 2121

Rails can imply the route from the form_for

e.g.

<%= form_for(@article) do |f| %>
 ...
<% end %>

If @article is new and not in the database, then rails can deduce you are creating a new one, then the route would be 

articles_path(@article), action: :create

If @article already exists in the database then rails can deduce you are editing an existing object, so the path is.

article_path(@article), action: :update

This applies to nested routes as well like the example code you have.

<%= form_for([@article, @article.comments.build]) do |f| %>

It know the parent route is article and the sub route is comments, since it is a new comment, the route would be

article_comments_path(@article, @article.comments.build), action: :create

If comment exists then it will be an update action

article_comment_path(@article, @comment), action: :update

Any form_for, link_to, etc can imply the path from the objects.

Upvotes: 3

Related Questions