ruby on rails - Merge link and select params -

in case have link params , select params

if filter @posts select (:per_page) , (:pub) params ok, because used params.merge in link.

but if want use first link , select, not work, because don't know should write params.merge in select.

code controller:

 def index     @posts = post     @posts = @posts.published unless params[:pub]     @posts = @posts.where(:published => params[:pub]) if params[:pub]     @posts = @posts.page(params[:page]).per(params[:per_page] || 5)   end 

code view

<%= select_tag :per_page, options_for_select(%w(1 2 3), params[:per_page].to_i), :onchange => "if(this.value){window.location='?per_page='+this.value;}" %>  <%= link_to "unpubl", params.merge(:pub => :f) %> <%= link_to "publ", params.merge(:pub => :t) %> 

if understood correctly trying create kind of html filters pass controller right ?

if case, should build html filters using form. way not have deal "merging" options params hash. form take care of you.

example:

<%= form_tag posts_path, method: :get %>   <%= select_tag :per_page, options_for_select(%w(1 2 3), params[:per_page].to_i) %>   <%= check_box_tag 'published', 'true' %>    <%= submit_tag 'submit' %> <% end %> 

then in controller:

params[:published] params[:per_page] 

will hold corresponding values.

more information form_tag here