How would I display the department_name rather than the department_id? - ruby-on-rails

Question

I am learning RoR and trying to setup an association between a User model and Department model. Currently, I am able to choose a department from a dropdown field and then save it. However, when showing the user or presenting the user in a list, the department shows the id number and not the department name. I cant figure out what I am doing wrong. Any help would be greatly appreciated!
Here are the models:
class User < ActiveRecord::Base
belongs_to :departments
end
class Department < ActiveRecord::Base
has_many :users
end
Here are the controllers:
class UsersController < ApplicationController
before_action :logged_in_user, only: [:edit, :update, :destroy]
before_action :admin_user, only: [:index, :destroy]
def new
#user = User.new
end
def create
#user = User.new(user_params)
if #user.save
log_in #user
flash[:success] = "Account created!"
redirect_to root_path
else
render 'new'
end
end
def index
#filterrific = initialize_filterrific(
User,
params[:filterrific],
select_options:
{
sorted_by_name: User.options_for_name,
department_select: Department.options_for_select
},
) or return
#users = #filterrific.find.page(params[:page])
respond_to do |format|
format.html
format.js
end
end
def show
#user = User.find(params[:id])
end
def edit
#user = User.find(params[:id])
end
def update
#user = User.find(params[:id])
if #user.update_attributes(user_params)
flash[:success] = "Profile successfully updated."
redirect_to edit_user_path
else
render 'edit'
end
end
def destroy
User.find(params[:id]).destroy
flash[:success] = "User deleted."
redirect_to users_url
end
private
def user_params
params.require(:user).permit(:name, :email, :work_phone, :department, :cell_phone, :password, :password_confirmation)
end
# Before filters
def logged_in_user
unless logged_in?
store_location
flash[:danger] = "Please log in first."
redirect_to login_url
end
end
# Confirms an admin user.
def admin_user
redirect_to(root_url) unless current_user.admin?
end
end
class DepartmentsController < ApplicationController
def create
#department = Department.new(department_params)
if #department.save
redirect_to(:action => 'index')
else
render 'new'
end
end
def index
#department = Department.all
end
def show
#department = Department.find(params[:id])
end
def edit
#department = Department.find(params[:id])
end
def update
#department = Department.find(params[:id])
end
def delete
#department = Department.find(params[:id])
end
def destroy
Department.find(params[:id]).destroy
redirect_to(:action => 'index')
end
private
def department_params
params.require(:department).permit(:name, :department_ids => [])
end
end
My edit html:
<% provide(:title, "Edit user") %>
<h1>Update your profile</h1>
<div class="row">
<div class="col-md-6 col-md-offset-3">
<%= form_for(#user) do |f| %>
<%= f.label :name, class: 'form-spacing' %>
<div class="input-group">
<%= f.text_field :name, class: 'form-control' %>
<span class="input-group-addon" id="basic-addon2">
<span class="glyphicon glyphicon-user"></span>
</span>
</div>
<%= f.label :email, class: 'form-spacing' %>
<div class="input-group">
<%= f.email_field :email, class: 'form-control' %>
<span class="input-group-addon" id="basic-addon2">
<span class="glyphicon glyphicon-envelope"></span>
</span>
</div>
<%= f.label :work_phone, class: 'form-spacing' %>
<div class="input-group">
<%= f.text_field :work_phone, class: 'form-control' %>
<span class="input-group-addon" id="basic-addon2">
<span class="glyphicon glyphicon-phone"></span>
</span>
</div>
<%= f.label :cell_phone, class: 'form-spacing' %>
<div class="input-group">
<%= f.text_field :cell_phone, class: 'form-control' %>
<span class="input-group-addon" id="basic-addon2">
<span class="glyphicon glyphicon-phone"></span>
</span>
</div>
<%= f.label :department, class: 'form-spacing' %>
<div class="input-group">
<div class="input-group-btn">
<%= f.collection_select :department, Department.order(:name), :id, :name, {}, {class: 'form-control'} %>
</div>
</div>
<%= f.label :password, class: 'form-spacing' %>
<%= f.password_field :password, class: 'form-control' %>
<%= f.label :password_confirmation, "Confirmation", class: 'form-spacing' %>
<%= f.password_field :password_confirmation, class: 'form-control' %>
<%= f.submit "Save changes", class: "btn btn-primary center-block btn-margin" %>
<% end %>
</div>
</div>
List HTML:
<div class="row well well-sm">
<div class="col-lg-6">
<div id="filterrific_results">
<div>
<%= page_entries_info users %><%= render_filterrific_spinner %>
</div>
</div>
</div>
<div class="pull-right">
<%= link_to 'Reset', reset_filterrific_url, class: "btn btn-default" %>
</div>
</div>
<table class="table table-condensed">
<tr>
<th>Profile</th>
<th>Name</th>
<th>Email</th>
<th>Work #</th>
<th>Cell #</th>
<th>Department</th>
</tr>
<% users.each do |user| %>
<tr>
<td><%= link_to user_path(user.id), class: "btn btn-xs" do %>
<i class="glyphicon glyphicon-user"></i>
<% end %>
</td>
<td><%= link_to(user.name, edit_user_path(user)) %></td>
<td><%= user.email %></td>
<td><%= user.work_phone %></td>
<td><%= user.cell_phone %></td>
<td><%= user.department %></td>
</tr>
<% end %>
</table>
<%= will_paginate users %>
Here is the trace I receive when trying to use user.department.name:
NoMethodError in Users#index
Showing C:/Users/ngkuligoski/Desktop/workspace/tgna_app/app/views/users/_list.html.erb where line #33 raised:
undefined method `name' for "30":String
Trace of template inclusion: app/views/users/index.html.erb
Rails.root: C:/Users/ngkuligoski/Desktop/workspace/tgna_app
Application Trace | Framework Trace | Full Trace
app/views/users/_list.html.erb:33:in `block in _app_views_users__list_html_erb___81315648_98180820'
app/views/users/_list.html.erb:23:in `_app_views_users__list_html_erb___81315648_98180820'
app/views/users/index.html.erb:39:in `_app_views_users_index_html_erb___1258199830_74038920'
app/controllers/users_controller.rb:33:in `index'
When switching belongs_to :department instead of belongs_to :departments, I get back the following error:
ActiveRecord::AssociationTypeMismatch in UsersController#update
Department(#70215520847100) expected, got String(#70215501520980)
Extracted source (around line #49):
47: def update
48: #user = User.find(params[:id])
49: if #user.update_attributes(user_params)
50: flash[:success] = "Profile successfully updated."
51: redirect_to edit_user_path
52: else
Rails.root: /Users/nkuligoski/Desktop/tgna_app
Application Trace | Framework Trace | Full Trace
app/controllers/users_controller.rb:49:in `update'
After removing :department from the user.params, I now do not receive an error when submitting the form. However, I am now recieving the following error at the list view and it I am getting a "Unpermitted parameter: department" error feedback from SQL.
NoMethodError in Users#index
Showing /Users/nkuligoski/Desktop/tgna_app/app/views/users/_list.html.erb where line #33 raised:
undefined method `name' for nil:NilClass
Extracted source (around line #33):
31 <td><%= user.work_phone %></td>
32 <td><%= user.cell_phone %></td>
33 <td><%= user.department.name %></td>
34 </tr>
35 <% end %>
36 </table>
Trace of template inclusion: app/views/users/index.html.erb
Rails.root: /Users/nkuligoski/Desktop/tgna_app
Application Trace | Framework Trace | Full Trace
app/views/users/_list.html.erb:33:in `block in _app_views_users__list_html_erb__2838324632886829267_70215593187400'
app/views/users/_list.html.erb:23:in `_app_views_users__list_html_erb__2838324632886829267_70215593187400'
app/views/users/index.html.erb:39:in `_app_views_users_index_html_erb___3592670951755992954_70215580220040'
app/controllers/users_controller.rb:33:in `index'

Answer 1

Try belongs_to :department instead of belongs_to :departments inside the User class.