How do I fix my resource post and delete methods - ruby-on-rails

Question

ControlPanelController aka control_panel_controller.rb is my main controller code in which I want to handle all the logistics. Picture class aka picture.rb is the model I use.
In my resources I have
resource :control_panel, only: [:index, :new, :create, :destroy], controller: 'control_panel'
rake routes shows me
control_panel POST /control_panel(.:format) control_panel#create
new_control_panel GET /control_panel/new(.:format) control_panel#new
DELETE /control_panel(.:format) control_panel#destroy
Here is my ControllerPanelController
class ControlPanelController < ApplicationController
def index
#pictures = Picture.all
end
def new
#picture = Picture.new
end
def create
#picture = Picture.new(picture_params)
if #picture.save
redirect_to control_panel_path, notice: "The picture #{#picture.name} has been uploaded."
else
render "new"
end
end
def destroy
#picture = Picture.find(params[:id])
#picture.destroy
redirect_to control_panel_path, notice: "The picture #{#picture.name} has been deleted."
end
private
def picture_params
params.require(:picture).permit(:name, :attachment)
end
end
in my app/views/control_panel/new.html.erb I use url: control_panel_path(#picture) so I can post to the ControlPanel create method but it doesn't work. I get
ERROR 1:
No route matches [GET] "/control_panel"
<% if !#picture.errors.empty? %>
<div class="alert alert-error">
<ul>
<% #picture.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
<%= form_for #picture, url: control_panel_path(#picture), :html => {:multipart => true} do |f| %>
<p>
<%= f.label :name %><br />
<%= f.text_field :name %>
</p>
<p>
<%= f.file_field :image %>
</p>
<p>
<%= f.label :remote_image_url, "or image URL" %><br />
<%= f.text_field :remote_image_url %>
</p>
<p><%= f.submit %></p>
<% end %>
ERROR 2:
When I try to delete a resource from index. I get
Couldn't find Picture without an ID
Extracted source (around line #22):
def destroy
#picture = Picture.find(params[:id])
#picture.destroy
redirect_to control_panel_path, notice: "The picture #{#picture.name} has been deleted."
end
Line 22 in that case is #picture = Picture.find(params[:id])
so what's the proper way to fix my routes.. I am using resource instead of resources due to having only one control panel since it's an app for one single user instead of multiple ones
EDIT:
code for app/views/control_panel/index.html.erb
<h1>Control Panel</h1>
<p>Manage all your pictures here</p>
<% if !flash[:notice].blank? %>
<div class="alert alert-info">
<%= flash[:notice] %>
</div>
<% end %>
<br />
<%= link_to "Add Picture", new_control_panel_path, class: "btn btn-primary" %>
<br />
<br />
<table class="table table-bordered table-striped">
<thead>
<tr>
<th>Name</th>
<th>Picture</th>
<th> </th>
</tr>
</thead>
<tbody>
<% #pictures.each do |picture| %>
<tr>
<td><%= picture.name %></td>
<td><%= image_tag picture.image_url(:thumb) %></td>
<td><%= button_to "Delete", control_panel_path(picture), method: :delete, class: "btn btn-danger", confirm: "Are you sure that you wish to delete #{pi
</tr>
<% end %>
</tbody>
</table>
**EDIT 2:**
Got the delete working by fixing button_to code as such
<td><%= button_to "Delete", control_panel_path(picture.id), method: :delete, class: "btn btn-danger", confirm: "Are you sure that you wish to delete #
</tr>

Answer 1

ERROR 1
You are getting the error because your app does not have a route corresponding to [GET] "/control_panel". Add :show to your control_panel routes and show action to your ControlPanelController. Also remember that singular resource does not have :index route/action.
http://guides.rubyonrails.org/routing.html#singular-resources
ERROR 2
You are getting the error because params[:id] is nil. control_panel_path(picture) does not set params[:id] because you are using control_panel_path and not pictures_path. Try passing id as GET parameter: control_panel_path(id: picture.id).
Nested resources is also a good way to go: http://guides.rubyonrails.org/routing.html#nested-resources

Answer 2

It seems your route control_panel#destroy does not take id param.
Use "resoureces" instead of "resource" like below.
resources :control_panel, only: [:index, :new, :create, :destroy], controller: 'control_panel'
This generates route like this.
control_panel_index GET /control_panel(.:format)
POST /control_panel(.:format)
new_control_panel GET /control_panel/new(.:format)
control_panel DELETE /control_panel/:id(.:format)