How to add parameters to current URL in rails [duplicate]

Question

I have a logic where I allow sorting on price and relevance. I am doing this by passing parameters to controller. My URL has a parameter - 'sort' which can have a value - 'price_lowest' or 'default'. The links looks like:

<a href="<%= request.fullpath + '&sort=price_lowest' %>">lowest prices</a> | 
<a href="<%= request.fullpath + '&sort=default' %>">relevance</a>

problem with the above code is that it "adds" parameters and does not "replace" them. I want to replace the value of &sort= parameter without adding a new value. E.g. I don't want :

../&sort=price_lowest&sort=price_lowest&sort=default

With the current logic - I am getting the above behaviour. Any suggestions ?

you should really avoid this kind of hacks. Named routes are made to answer your needs — apneadiving
– apneadiving, Commented Jul 8, 2011 at 13:43

Deepak Mahakale · Accepted Answer · 2019-10-07 11:07:16Z

68

In order to preserve the params I did this:

<%= link_to 'Date', params.merge(sort: "end_date") %>

However the url will be ugly.

UPDATE

For Rails 5 use:

<%= link_to 'Date', request.params.merge(sort: "end_date") %>

edited Oct 7, 2019 at 11:07

Deepak Mahakale

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answered Dec 8, 2011 at 9:57

lulalala

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3 Comments

Siwei Over a year ago

why not <%= link_to 'Date', params.merge(:sort => "end_date") %> btw your name looks interesting , like Chinese...

miguel savignano Over a year ago

In rails 5 you need to use request.params <%= link_to 'Date', request.params.merge(:sort => "end_date") %>

Henrik N Over a year ago

For Rails 5, github.com/rails/rails/issues/26289 is a good read, with an explanation of the risks and examples of solutions.

idlefingers · Accepted Answer · 2011-07-08 13:57:01Z

33

If you only need one cgi param and want to stay on the same page, this is very simple to achieve:

<%= link_to "lowest prices", :sort => "price_lowest" %>

However, if you have more than one, you need some logic to keep old ones. It'd probably be best extracted to a helper, but essentially you could do something like this to keep the other params..

<%= link_to "lowest prices", :sort => "price_lowest", :other_param => params[:other] %>

Named routes will only really help you here if you need to go to another page.

answered Jul 8, 2011 at 13:57

idlefingers

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9 Comments

Ved Over a year ago

This removes the existing parameters. I end up with - localhost:3000/view?sort=price_lowest - all other previous parameters are lost.

Ved Over a year ago

Can you elaborate your solution a bit ?

idlefingers Over a year ago

As I said in the answer, if you have more than the one param, you'll need to have some logic to keep the ones you're not setting. A helper is definitely the best place for something like this. Here's a (potentially flawed, poorly written and untested) example of how to achieve that: raw.github.com/gist/e22343babcb76381304c/…

Joshua Pinter Over a year ago

And if you only need the url you can use url_for params.merge( sort: 'price_lowest' )

Fabian de Pabian Over a year ago

Does not work, loses all other params

|

scarver2 · Accepted Answer · 2013-08-31 18:36:21Z

If a path is not passed to the link_to method, the current params are assumed. In Rails 3.2, this is the most elegant method for adding or modifying parameters in a URL:

<%= link_to 'lowest prices', params.merge(sort: 'end_date') %>
<%= link_to 'relevance', params.merge(sort: 'default') %>

params is a Ruby hash. Using merge will either add a key or replace the value of a key. If you pass nil as the value of a key, it will remove that key/value pair from the hash.

<%= link_to 'relevance', params.merge(sort: nil) %>

Cite:

Combined with the active_link_to Gem and you'll also have nice active classes on your filters. - github.com/comfy/active_link_to
You should update your answer for strong parameters and using params.permit! in your controller.

Alex Freshmann · Accepted Answer · 2011-12-30 11:39:39Z

My working solution on Rails 3.1 of course, it's hardcode, and has to be refactored.

item model

  def self.get(field,value)
    where(field=>value)
  end

items controller

@items=Item.all
 if params[:enabled]
  @[email protected](:enabled, params[:enabled])
end
if params[:section]
  @[email protected](:section_id, params[:section])
end

items helper

def filter_link(text, filters={}, html_options={})
  trigger=0
  params_to_keep = [:section, :enabled]
  params_to_keep.each do |param|
    if filters[param].to_s==params[param] && filters[param].to_s!="clear" || filters[param].to_s=="clear"&&params[param].nil?
      trigger=1
    end
    if filters[param]=="clear"
      filters.delete(param)
    else
      filters[param]=params[param] if filters[param].nil?
    end
  end
  html_options[:class]= 'current' if trigger==1
  link_to text, filters, html_options
end

items index.html.erb

<%= filter_link 'All sections',{:section=>"clear"} %>
<% @sections.each do |section| %>
   <%= filter_link section.title, {:section => section} %>
<% end %>

<%= filter_link "All items", {:enabled=>"clear"} %>
<%= filter_link "In stock", :enabled=>true %>
<%= filter_link "Not in stock", :enabled=>false %>

Dave A-R · Accepted Answer · 2011-07-08 13:58:04Z

0

It's not quite the answer to the question that you're asking, but have you thought about using the Sorted gem to handle your sorting logic and view links?

answered Jul 8, 2011 at 13:58

Dave A-R

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