Ruby - error rendering a view referencing a loop that I never wrote

Question

I have this controller:

class AlexesController < ApplicationController
  # GET /alexes
  # GET /alexes.json
  def index
    #@alexes = Alex.all

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

  # GET /alexes/1
  # GET /alexes/1.json
  def show
  #  @alex = Alex.find(params[:id])

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

  # GET /alexes/new
  # GET /alexes/new.json
  def new
    @alex = Alex.new

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

  # GET /alexes/1/edit
  def edit
    @alex = Alex.find(params[:id])
  end

  # POST /alexes
  # POST /alexes.json
  def create
    @alex = Alex.new(params[:alex])

    respond_to do |format|
      if @alex.save
        format.html { redirect_to @alex, notice: 'Alex was successfully created.' }
        format.json { render json: @alex, status: :created, location: @alex }
      else
        format.html { render action: "new" }
        format.json { render json: @alex.errors, status: :unprocessable_entity }
      end
    end
  end

  # PUT /alexes/1
  # PUT /alexes/1.json
  def update
    @alex = Alex.find(params[:id])

    respond_to do |format|
      if @alex.update_attributes(params[:alex])
        format.html { redirect_to @alex, notice: 'Alex was successfully updated.' }
        format.json { head :no_content }
      else
        format.html { render action: "edit" }
        format.json { render json: @alex.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /alexes/1
  # DELETE /alexes/1.json
  def destroy
    @alex = Alex.find(params[:id])
    @alex.destroy

    respond_to do |format|
      format.html { redirect_to alexes_url }
      format.json { head :no_content }
    end
  end
end

It gets called when this link gets pressed:

<%= link_to "Alex Link", alexes_path(@alex) %>

so I am assuming that the get-all part of the controller would get invoked, and I commented out lines in the controller that I thought would get invoked, but I still get this error:

undefined method `each' for nil:NilClass

from line 10:

7:     <th></th>
8:   </tr>
9: 
10: <% @alexes.each do |alex| %>
11:   <tr>
12:     <td><%= link_to 'Show', alex %></td>
13:     <td><%= link_to 'Edit', edit_alex_path(alex) %></td>

Any idea where the problem is happening?

Thanks!

@fl00r I thought commenting that line would stop the application from making a db call since I didn't make a schema yet. — GeekedOut
– GeekedOut, Commented Apr 9, 2012 at 22:48

fl00r · Accepted Answer · 2012-04-09 22:48:55Z

1

<%= link_to "Alex Link", alexes_path(@alex) %>

=>

<%= link_to "Alex Link", alex_path(@alex) %>

or

<%= link_to "Alex Link", @alex %>

answered Apr 9, 2012 at 22:48

fl00r

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7 Comments

GeekedOut Over a year ago

thanks. I am still confused about the differences of each of those syntaxes. Whats the difference between them? Thanks again!

fl00r Over a year ago

It is convention. When you need something singular (one Alex) you should write singular routes, and if you want to get a bunch of items you should use pluralized routes

GeekedOut Over a year ago

thanks! and the 3rd line..what implication does it have if you don't use the alex_path() ?

GeekedOut Over a year ago

Also, how would it effect the error I am encountering? Where is that each loop? I dont see it in the controller.

ardavis Over a year ago

It's in your view. @alexes.each do |alex|. :)

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