[Solved] Does rails use method: :patch for editing with _form.html.erb?

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As mentioned in the tutorial you shared:

The reason we can use this shorter, simpler form_for declaration to stand in for either of the other forms is that @article is a resource corresponding to a full set of RESTful routes, and Rails is able to infer which URI and method to use.

Also, from the reference given there:

For an existing resource or record for @post, it is equivalent to:

<%= form_for @post, as: :post, url: post_path(@post), method: :patch, html: { class: "edit_post", id: "edit_post_45" } do |f| %>
  ...
<% end %>

Whereas, for a new record of the resource, i.e. Post.new, it is equivalent to

<%= form_for @post, as: :post, url: posts_path, html: { class: "new_post", id: "new_post" } do |f| %>
  ...
<% end %>

Thus, in this case, magic lies in the rails with 2 things, helping rails understand what to do with this form:

  1. Your defined routes for your model, resources :article
  2. The type(Existing record or a new record) of resource object passed to form_for.

solved Does rails use method: :patch for editing with _form.html.erb?