form_tag

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- What's this?
form_tag(url_for_options = {}, options = {}, &block)
public
form_tag(false, method: :get) # => <form method=“get”>
form_tag(‘http://far.away.com/form’, authenticity_token: false) # form without authenticity token
form_tag(‘http://far.away.com/form’, authenticity_token: “cf50faa3fe97702ca1ae”) # form with custom authenticity token

form_tag with named route and html class
<% form_tag position_user_card_path(@user, card), :method => :put, :class => ‘position-form’ do %>

How to submit current url
For example to change some kind of param on select change…
<%= form_tag({}, {:method => :get}) do %> <%= select_tag :new_locale, options_for_select(I18n.available_locales, I18n.locale), :onchange => "this.form.submit();" %> <% end %>

To add an ID to the form
Found this the hard way, but to add an ID to the form generated by form_tag, you must explicitly make hashes.
Add ID
<%= form_tag({:action => 'create'}, {:id => 'anID'}) %>

Erb tags
The <% -%> is not being used since Rails 3.
The example above should be changed to:
<%= form_tag('/posts') do %> <div><%= submit_tag 'Save' %></div> <% end %>