Rails forms: How to append request params?

Question

I got a list page and I filter items via links with get params (I can choose many links so query would be like "?param1=value1&param2=value2"). But also I have to filter it by text field, so I made a form:

<form>
  <%= text_field_tag :zip, params[:zip] %>
  <%= submit_tag 'OK', :name => nil %>
</form>

But when I submit it, text field param replaces existing query params. So, how to make text field value add to query, not to replace it?

score 6 · Answer 1 · answered Mar 04 '16 at 14:20

Since I was just dealing with this problem in Rails 4 I thought I'd share my solution. My page gets loaded with a sport_id parameter, and when the user specifies a sort-order I wanted it to submit a GET request for page.url/event?sport_id=1&sortby=viewers but it wouldn't preserve the sport_id parameter until I added a hidden field tag in the form like so:

<%= hidden_field_tag :sport_id, params[:sport_id] %>

This solution does submit an empty sport_id parameter if that parameter was not in the original request, but that is easily prevented by encapsulating the hidden field in an <% if params[:sport_id].present? %> condition.

Joshua Pinter · Answer 2 · 2021-01-28T01:11:56.397

2

Use `hidden_field_tag`.

Inside of your form, just set hidden_field_tags for the existing GET params, like so:

<% request.query_parameters.collect do |key, value| %>
  <%= hidden_field_tag key, value %>
<% end %>

This will ensure that your existing params persist.

edited Jan 28 '21 at 01:11

answered Jan 30 '20 at 04:25

Joshua Pinter

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will this work work for nested params ? – Suleman Uzair Dec 26 '22 at 09:36

fl00r · Answer 3 · 2011-05-18T21:02:27.110

1

Rails 3?

<%= form_tag your_path(params.except(:controller, :action)), :method => :get do %>
  <%= text_field_tag :zip, params[:zip] %>
  <%= submit_tag 'OK', :name => nil %>
<% end %>

edited May 18 '11 at 21:02

answered May 18 '11 at 18:19

fl00r

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I tried it too: not working. This way query looks like: .action=index&controller=controllername&param1=value?method=get – Mikhail Knyazev May 18 '11 at 18:44
typo: a bracket should be before :mathod – fl00r May 18 '11 at 18:58
So that it behaves like in the beginning: replaces existing params :( – Mikhail Knyazev May 18 '11 at 19:04
it shouldn't. What do you use as `your_path` ? – fl00r May 18 '11 at 19:09
I use this: match '/path', :controller => :name, :action => 'index', :as => :path – Mikhail Knyazev May 18 '11 at 19:20
<%= form_tag path_path(params.except([:controller, :action])), :method => :get do %> <%= text_field_tag :zip, params[:zip] %> <%= submit_tag 'OK', :name => nil %> <% end %> – Mikhail Knyazev May 18 '11 at 20:47
`<%= form_tag your_path(params.except(:controller, :action)), :method => :get do %>` remove square brackets – fl00r May 18 '11 at 21:02
checkout this approach http://stackoverflow.com/questions/5913525/get-url-for-current-page-but-with-a-different-format/5913552#5913552 – fl00r May 18 '11 at 21:38

Rails forms: How to append request params?

3 Answers3

Use hidden_field_tag.

Use `hidden_field_tag`.