Rails: NoMethodError in Applications#index - ruby-on-rails

Question

Please note that "applications" was a poor naming convention. This is because it is a scholarship application portal.
I get the following error when I try to open the index for applications.
NoMethodError in Applications#index
Showing /home/zane/scholarship-application/app/views/applications/_current_user_application.html.erb where line #22 raised:
undefined method `name' for nil:NilClass
Extracted source (around line #22):
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<tbody>
<tr>
<td><%= current_user.application.name %></td>
<td><%= current_user.application.name %></td>
<td><%= current_user.application.gender %></td>
<td><%= current_user.application.date_of_birth %></td>
Here's what the code for that page looks like:
<% if user_signed_in? && current_user.role == "User" %>
<h1 class="center">Your Application</h1>
<table class="table">
<thead>
<tr>
<th>Name</th>
<th>Gender</th>
<th>Date of birth</th>
<th>GPA</th>
<th>Address</th>
<th>State</th>
<th>University</th>
<th>Essay</th>
<th colspan="3"></th>
</tr>
</thead>
<tbody>
<tr>
<td><%= current_user.application.name %></td>
<td><%= current_user.application.gender %></td>
<td><%= current_user.application.date_of_birth %></td>
<td><%= current_user.application.gpa %></td>
<td><%= current_user.application.address %></td>
<td><%= current_user.application.state %></td>
<td><%= current_user.application.university %></td>
<td><%= current_user.application.essay %></td>
<td><%= link_to 'Show', current_user.application %></td>
<td><%= link_to 'Edit', current_user.edit_application_path(application) %></td>
<td><%= link_to 'Destroy', current_user.application, method: :delete, data: { confirm: 'Are you sure?' } %></td>
</tr>
</tbody>
</table>
<% end %>
User Model:
class User < ActiveRecord::Base
#Defining different roles
enum role: [:Guest, :User, :Admin]
#Users can only have one scholarship application
has_one :applications
# Include default devise modules. Others available are:
# :confirmable, :lockable, :timeoutable and :omniauthable
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable
end
Ability Model:
class Ability
include CanCan::Ability
def initialize(user)
user ||= User.new # guest user (not logged in)
if user.role == "Admin"
can :manage, :all
elsif user.role == "User"
can :manage, Application
can :manage, User
else
can :read, Static_Page
end
end
end
Application Model:
class Application < ActiveRecord::Base
belongs_to :user
#Users may only submit one application
validate :limit_applications, :on => :create
#User must fully fill out all forms application
validates :name, presence: true
validates :gender, presence: true
validates :date_of_birth, presence: true
validates :gpa, presence: true
validates :university, presence: true
validates :address, presence: true
validates :state, presence: true
private
def limit_applications
limit = 1
if self.user.applications.(:reload).count >= limit
errors.add(:base, "You can only create #{limit} application.")
end
end
end
Schema.rb
create_table "applications", force: :cascade do |t|
t.string "name"
t.string "gender"
t.date "date_of_birth"
t.string "gpa"
t.text "essay"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.string "university"
t.string "address"
t.string "state"
t.integer "user_id"
end
create_table "entries", force: :cascade do |t|
t.string "name"
t.boolean "winner"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
create_table "nasa_apis", force: :cascade do |t|
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
create_table "users", force: :cascade do |t|
t.string "first_name"
t.string "last_name"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.string "email", default: "", null: false
t.string "encrypted_password", default: "", null: false
t.string "reset_password_token"
t.datetime "reset_password_sent_at"
t.datetime "remember_created_at"
t.integer "sign_in_count", default: 0, null: false
t.datetime "current_sign_in_at"
t.datetime "last_sign_in_at"
t.inet "current_sign_in_ip"
t.inet "last_sign_in_ip"
t.integer "role", default: 1
t.boolean "winner", default: false
t.integer "application_id"
end

Answer 1

I'm going to assume you made a model called application.rb. When you type current_user.application, Rails searches for a method called application. This will only work if you specified a database association in your model to connect it to a table called applications. I don't know what the association is, but if you're calling .application (singular), I'd imagine you need to add one of these to your User model: has_one :application or belongs_to :application. Keep in mind you'll also need to add the corresponding database association to the Application Model. There's also a chance that Rails doesn't like the word Application and that could just be screwing up everything.
Also, the attributes you named sound an awful lot like attributes that should belong to a user, not an application. Is there any chance you don't need the .application at all and these are attributes of your user model? That would mean writing code like current_user.email, not current_user.application.email.

Answer 2

Now that you've included more code the answer is pretty clear: change has_one :applications to has_one :application