Ruby on Rails search & Result on the same page error - ruby-on-rails

Question

Here the show.html displays a dropdown, which contain Roles.
When we select the role we should able to get permission result in the same page
For that I used partial, but getting error as given in the image,
Without using partial when i tried to display in a separate display.html.erb file , I am getting proper result.
but i want to get result in same show.html.erb file.
Kindly give my some suggestions to attain the proper results
permission_controller
def display
param = params[:role]
id=param[:id]
#roles = Role.includes(:permissions).all
#uniq_controller = Role.joins(:permissions).where('roles.id=?',id).select('permissions.*').group_by { |p| p.description }
redirect_to permissions_show_path
end
def show
#permission = Permission.new
end
show.html.erb
<%= form_tag(:controller => "permissions", :action => "display") do %>
<%= collection_select(:role, :id, Role.all, :id, :name) %>
<button type="submit">search</button>
<% end %>
<th width="25px"> <%= "Controller" %></th>
<th width="25px"> <%= "Permissions" %></th>
<% #uniq_controller.each do |permission| %>
<%= render partial:"display", locals:{permission:permission} %>
<% end %>
_display.html.erb
<thead>
<th width="25px"> <%= permission.first.gsub("_"," ") %></th>
<% permission.second.each do |cont| %>
<tr>
<th width="25px"><%= check_box_tag :permission_ids, {multiple: true},
cont.id %><%= cont.name %></th>
</tr>
<% end %>
</thead>

Answer 1

You haven't defined #uniq_controller in the show action which triggered that error. Just define it in the show action
def show
#permission = Permission.new
#uniq_controller = Role.joins(:permissions).where('roles.id=?',id).select('permissions.*').group_by { |p| p.description }
end

Answer 2

You have not defined #uniq_controller in the show action in permission_controller controller which triggers this error.
I'd recommend that you define a method called uniq_controller in permission_controller as follows:
def uniq_controller(id)
Role.joins(:permissions).where('roles.id=?',id).select('permissions.*').group_by { |p| p.description }
end
and then make it available in your view as a helper method by adding this code to your permission_controller:
helper_method :uniq_controller
So the code in permission_controller should be like:
helper_method :uniq_controller
def display
#roles = Role.includes(:permissions).all
redirect_to permissions_show_path
end
def show
#permission = Permission.new
end
def uniq_controller(id)
Role.joins(:permissions).where('roles.id=?',id).select('permissions.*').group_by { |p| p.description }
end
Then in your view show.html.erb replace:
#uniq_controller.each
with:
uniq_controller(params[:role][:id]).each
This should fix the error that you are getting and follows Rails practices, for more details about helper_method please refer to:
https://apidock.com/rails/ActionController/Helpers/ClassMethods/helper_method
One more recommendation is to rename permission_controller to permissions_controller to follow Rails resources/controller naming convention.