Ruby on Rails

I am relatively new to this and completely lost. I'm trying to make a
user's profile page. If the user is an admin, they can see all the
users, as well as access and edit/update each user's profile page.

I finally got it to work...but when I logged in as a user I received
several errors which can be noted in the accompanying jpgs.

The first jpg is the url that I am assuming the user will go to for
their profile page.

The second jpg (User-Index) is the error I get when I try to access the
index page as a non-admin.

The third jpg (User-Edit) is the error I get when I try to access the
Edit page for a user account as a non-admin.

The project can be found at: https://github.com/GBressler/esl-site

Any help that could be proved on these issues would be greatly
appreciated.

Here is my Users Controller:

class UsersController < ApplicationController
before_action :set_user, only: [:show, :edit, :update, :destroy]

def index
if current_user.id == 1
@users = User.all
else
render 'profile_page'
end
end

def show
render 'profile_page'
authorize! :show, @user
@user = User.find(params[:id])
current_user.first_name
end

def update
end

def edit
authorize! :edit, @user
end

def destroy
end

private

def set_user
@user = User.find(params[:id])
end


def user_params
params.require(:user).permit(:id, :first_name, :last_name, :email,
:username)
end
end


Here's the code for my yet-to-be developed Edit and Profile Page:
<h1>hi</h1>

<p><%= @user.username %></p>

Here's the code for the index page that the admin sees:

<h1>Listing users</h1>
<!-- START_HIGHLIGHT -->
<% if notice %>
<p id="notice"><%= notice %></p>
<% end %>
<!-- END_HIGHLIGHT -->

<table>
<thead>
<tr>
<th>Name</th>
<th>Username</th>
<th></th>
<th></th>
</tr>
</thead>

<tbody>
<% @users.each do |user| %>
<tr>
<td><%= user.first_name %></td>
<td><%= user.username %></td>
<td><%= link_to 'Show', user %></td>
<td><%= link_to 'Edit', edit_user_path(user) if can?(:edit,
user)%></td>
<td><%= link_to 'Destroy', user, method: :delete,
data: { confirm: 'Are you sure?' } %></td>
</tr>
<% end %>
</tbody>


</table>

Attachments:
http://www.ruby-forum.com/attachment/11128/nonadmin-user-page.jpg
http://www.ruby-forum.com/attachment/11129/User-Index.jpg
http://www.ruby-forum.com/attachment/11130/User-Edit.jpg


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