Rails forms: how not to rewrite existing get params after submitting a form?

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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?

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.

Action Controller Overview — Ruby on Rails Guides, Rails does not make any distinction between query string parameters and POST parameters because it gets run # by an HTTP GET request, but this does not When this form is submitted, the value of params[:client] will be { "name" existing ( Marshal -serialized) cookies on read and re-write them in the JSON format. The name passed to form_for controls the key used in params to access the form’s values. Here the name is article and so all the inputs have names of the form article[attribute_name]. Accordingly, in the create action params[:article] will be a hash with keys :title and :body. You can read more about the significance of input names in the

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 %>

form_for (ActionView::Helpers::FormHelper), :method - The method to use when submitting the form, usually either “get” or : enforce_utf8 - If set to false, a hidden input with name utf8 is not output. For example, if @post is an existing record you wish to edit, you can create the form using In this case Rails will simply infer the appropriate URL from the record itself. The previous sections did not use the Rails form helpers at all. While you can craft the input names yourself and pass them directly to helpers such as text_field_tag Rails also provides higher level support. The two tools at your disposal here are the name parameter to form_for and fields_for and the :index option that helpers take.

Use hidden_field_tag.

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

form_content = request.query_parameters.collect do |key, value|
  hidden_field_tag key, value
end

This will ensure that your existing params persist.

heartcombo/simple_form: Forms made easy for Rails! It's , Rails provides succint resource-oriented form generation with form_for like this: There, form_for is able to generate the rest of RESTful form parameters based Worth noting is that the form_for tag is called in a ERb evaluation block, not an ERb output block. For example, if @post is an existing record you want to edit Home » Html » submitting a GET form with query string params and hidden params disappear submitting a GET form with query string params and hidden params disappear Posted by: admin November 12, 2017 Leave a comment

The 10 Most Common Mistakes That Rails Developers Make, It does not aim to create a lot of different logic from the default Rails form helpers when you render the form with invalid data (after submitting for example). You can overwrite the default label by passing it to the input method. You can also redefine existing Simple Form inputs by creating a new class with the same name . Alternatively, take the data from the hidden form items, and add them to the URL and additional query parameters, then replace the form submit button with a simple anchor link, or a server Location: redirect if you don't want any interaction with the end user.

There are many Ruby on Rails best practices that can help you avoid these Logic for finding the right model object given the parameters passed in from the request. Common Mistake #9: Getting married to existing database migrations The schema.rb file can even be generated when no migrations are present by � Before the introduction of the form_with helper in Rails 5.1, the now soft-deprecated form_tag and form_for helpers were heavily used. The form_with helper combines features of these other tags to provide a much better experience when building forms. You can read about the form_tag and form_for helpers here. Forms and Validations

Data binding will take the form-submitted string values for name, game, and region (if set) and set those properties in your command object player. The form-submitted string values for wins and losses will also be set in player after automatic type-conversion to int. The convention of using the same name for domain class properties and input

Comments
  • Or How to append new GET params to existing params.
  • I tried it too: not working. This way query looks like: .action=index&controller=controllername&param1=value?method=get
  • typo: a bracket should be before :mathod
  • So that it behaves like in the beginning: replaces existing params :(
  • it shouldn't. What do you use as your_path ?
  • I use this: match '/path', :controller => :name, :action => 'index', :as => :path