Rails Routing - :action = 'new' returns error "No route matches {:action="show"... in the same controller

Question

I am writing the code for a model called "ExternalDatabase".

The model file has no code in it outside of the class declaration. I have added view pages for index, new, show, and _form .html.erb.

config/routes.rb contains the line resources :external_databases. The model contains no nested resources at this time. There are other models declared within this application, though none of them interact with this model at the moment and they are all tested and are functional and closed prior to declaring resources :external_databases.

I have a link from within the index view to new_external_database_path, which behaves exactly like {:action => "new", :controller => "external_database"} if I am following correctly.

This should theoretically load application/external_databases/new which will render _form.html.erb. The first line of _form is <%= form_for(@external_database) do |f| %>

The problem as stated in the post title occurs when using the link to /new. The url application/external_databases/new has the following error:

No route matches {:action=>"show", :controller=>"external_databases"}

When I created a data member using rails console, it was displayed properly by index and show. The same _form file is used by the edit method, and successfully edits the console-created data member. Destroy also functions.

...So why isn't it recognizing the new method?

My controller code for this model:

    class ExternalDatabasesController < ApplicationController

     def index 
      @external_databases = ExternalDatabase.all

      respond_to do |format|  
       format.html # index.html.erb
       format.json { render :json => @external_databases }
      end
     end

     # POST /external_databases
     # POST /external_databases.json

     def new 
      @external_database = ExternalDatabase.new

      respond_to do |format|
       format.html # new.html.erb
       format.json { render :json => @external_database }
      end
     end

     def show
      @external_database = ExternalDatabase.find(params[:id])

      respond_to do |format| 
       format.html # show.html.erb
       format.json {render :json => @external_database }
      end
     end

     def create
      @external_database = ExternalDatabase.new(params[:external_database])

      respond_to do |format|
       if @external_database.save
        format.html {redirect_to @external_database, :notice => "New External Database         Profile was created successfully!"}
        format.json {render :json => @external_database, :status => :created, :location => @external_database}
       else
        format.html {render :action => "new"}
        format.json { render :json => @external_database.errors, :status =>         :unprocessable_entity }
       end
      end
     end


     #GET /external_databases/1/edit
     def edit
      @external_database = ExternalDatabase.find(params[:id])
     end

     # PUT /external_databases/1
     # PUT /external_databases/1.json
     def update 
      @external_database = ExternalDatabase.find(params[:id])

      respond_to do |format|
       if @external_database.update_attributes(params[:external_database])
        format.html {redirect_to @external_database, :notice => "External Database         Profile was updated successfully!" }
        format.json {head :ok}
       else 
        format.html { redner :action => "edit" }
        format.json {render :json => @external_database.errors, :status =>         :unprocessable_entity }
       end
      end
     end


     # DELETE /external_databases/1
     # DELETE /external_databases/1.json
     def destroy
      @external_database = ExternalDatabase.find(params[:id])
      @external_database.destroy

      respond_to do |format| 
       format.html { redirect_to external_databases_rul }
       format.json { head :ok }
      end
     end

    end

Update: Added routes.rb and Views code

My routes.rb file:

    App::Application.routes.draw do

      resources :type_as do 
         resources :type_bs
         end

      resources :type_bs do 
        resources :type_as
        resources :type_cs
        end

      resources :type_cs do
       resources :type_bs
       end

      resources :external_databases

      root :to => "home#index"

    end

Views:

external_databases_form

    <%= form_for(@external_database) do |f| %>

     
      <%= f.label :name %>

      <%= f.text_field :name %>

     
     
      <%= f.label :description %>

      <%= f.text_field :description %>

     
     
      <%= f.label :url %>

      <%= f.text_field :url %>

     
     
       <%= f.submit %>
     
    <% end %>

index.html.erb

    <%= notice %>
    External Databases

    
     <% @external_databases.each do |exdb| %>
      
     <% end %>
    
     
      Database Name
     

       <%= exdb.name %>
       <%= truncate(exdb.description) %>
       <%= link_to 'Show', exdb %>
       
       <%= link_to 'Visit', exdb.url, :target => "_blank" %>  
       <%= link_to 'Edit', edit_external_database_path(exdb)%>
       <%= link_to 'Destroy', exdb, :confirm => 'Are you sure?', :method => :delete %>
      

    

    <%= link_to 'New External Database Profile', { :action => "new", :controller => "external_databases" }%> | 
    <%= link_to 'Home', root_path %>

new.html.erb

    Creating a new External Database Profile

    <%= render 'form' %>

    <%= link_to 'Back', external_database_path %>

show.html.erb

    <%= notice %>

    
      
      External Database Name
      Database ID
     
     
      <%= @external_database.name %>
      <%= @external_database.id %>
     
     
      URL
     
     
      <%= @external_database.url %>
      <%= link_to 'Visit External Database', @external_database.url %>
     
    



    
     
Description
     
      

     
    

    



    <%= link_to 'Back to External Database Index', external_databases_path %> |
    <%= link_to 'Edit', edit_external_database_path(@external_database) %> | 
    <%= link_to 'Destroy', :confirm => 'Are you sure?', :method => :delete %>

Jay H. · Accepted Answer

You have a typo in your new.html.erb file in your 'back' link. It should be:

external_databases_path

You can compare it with your own back link in show.html.erb above.

Fixed: new.html.erb

Creating a new External Database Profile

<%= render 'form' %>

<%= link_to 'Back', external_databases_path %>

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