Rails用DELETE method提交表单讲解

Sometimes we need to submit form using methods other than ‘post’, in this example, it’s ‘delete’.

For example, I wanted to delete a user when a form is submitted with the user name and ‘delete’ method.

1. I created the route like this:

delete ‘test url’, to: ‘users#destroy’

So I will handle the delete function in 'users' controller, 'destroy' action.

2.1 The view code:

<%= form_tag(‘test url’, method: :delete) do %>
<%= label_tag ‘Please enter the username that you want to delete:’ %>
<%= text_field_tag :name %>
<%= submit_tag ‘Send delete request’ %>
<% end %>

2.2 This view code generates the following html code:

<form action=”test url” accept-charset=”UTF-8″ method=”post”>
<input name=”utf8″ type=”hidden” value=”✓” />
<input type=”hidden” name=”_method” value=”delete” />
<input type=”hidden” name=”authenticity_token” value=”5Rj1osaYdsOkH94pyig99l5Ud64U1H25LCuK33plQuf2Lg+a/+Ub6VVlYBSOvDotOIrX3SCKB6mYsfZTyPkI+Q==” />
<label for=”Please_enter_the_username_that_you_want_to_delete:”>Please enter the username that you want to delete:</label>
<input type=”text” name=”name” id=”name” />
<input type=”submit” name=”commit” value=”Send delete request” />
</form>

As you can see above, the form method is still ‘post’. I was really confused at this point, since the method didn’t turn out to be the ‘delete’ method I expected.

But actually rails generated a hidden input called _method that is supposed to carry the intended verb for the server to interpret. In this case, it’s ‘delete’, exactly what I need.

3. Now let’s see the view, it looks like this:



I typed ‘test user name’ and hit ‘Send delete request’
button, it sent out this http request:



The request method is ‘Post’, with form data ‘_method’ set as ‘delete’ which sent my request to 'users' controller, 'destroy' action. 

Mission
complete!