undefined method `jobs' for nil:NilClass - ruby-on-rails

Question

i'm a beginner in ruby on rails and getting an error i seem not to understand.
under the profile page for the Tradesman, i am trying to call all trades and all listed jobs under the trade. Trade has_many jobs & jobs has_many trades.
TrademanprofilesController:
class TrademanprofilesController < ApplicationController
def show
#user = current_user
end
def jobleads
end
def purchased
end
def memberBenifits
end
def account
end
def editjoblead
#trades = Trade.order(:name)
#jobs = Job.all
if params[:search].present?
#applications = Application.near(params[:search], 100, order: 'distance')
#hash = Gmaps4rails.build_markers(#applications) do |application, marker|
marker.lat application.latitude
marker.lng application.longitude
marker.infowindow application.location
marker.infowindow application.trade.name
end
else
#applications = Application.all
end
#applications_trades = #applications.group_by { |t| t.trade_id } end end
The views page which is a partial being called elsewhere. _trademanprofile_skills.html.erb:
<table>
<thead>
<tr>
<th>Name</th>
<th colspan="3"></th>
</tr>
</thead>
<tbody>
<% #trades.each do |trade| %>
<tr>
<td>
<%= trade.name %></br>
<ul><% #trade.jobs.each do |job| %></ul>
<li><%= job.name %></li>
<% end %>
</td>
<td><%= link_to 'Show', trade %></td>
</tr>
<% end %>
</tbody>
</table>
model: Trade.rb
class Trade < ActiveRecord::Base
attr_accessible :name, :job_ids
has_many :applications
has_many :jobs, through: :applications
end
model: Job.rb
class Job < ActiveRecord::Base
attr_accessible :name, :trade_ids
has_many :applications
has_many :trades, through: :applications
end
The error i get:
NoMethodError in Trademanprofiles#editjoblead
undefined method `jobs' for nil:NilClass
and highlights this line:
<ul><% #trade.jobs.each do |job| %></ul>
<li><%= job.name %></li>
<% end %>
i tried the below but did not work
<% #trades.each do |trade| %>
<%= trade.name %>
<%= trade.jobs %>
<% end %>
i got this displayed:
#<Job::ActiveRecord_Associations_CollectionProxy:0x00000106b0f1d8>
i also tried the below but did not work
<% #trades.each do |trade| %>
<%= trade.name %>
<%= trade.job_ids %>
<% end %>
but it only returned the id numbers of the jobs under the trade Aerial / Network
Aerial / Network Specialist
[978, 979, 980, 1039, 1040, 1041]
my routes file:
Rails.application.routes.draw do
resources :images
devise_for :users
resources :jobstartdates
resources :budgets
resources :applications do
collection do
get :search
get :search_result
get :business_details
end
end
get 'home/index'
resources :trades
resources :jobs
root to: 'home#index', as: 'home'
resource :trademanprofiles do
get :show
get :jobleads
get :purchased
get :memberBenifits
get :account
get :editjoblead
end
resources :employeenumbers
resources :businesstypes
resources :trademanroles
resources :titles
resources :adverts
resources :distances
i would like the Trade name & the Job names (not the ids) to be displayed. Many thanks an i truly apologise if this is a simple question.

Answer 1

If you look at your method
def editjoblead
#trades = Trade.order(:name) #this will return a collection of trades to you
#jobs = Job.all
#other logic
end
and in your view you have this
<ul>
<% #trade.jobs.each do |job| %></ul>
<li><%= job.name %></li>
<% end %>
First of all you need to correct your html you have closed ul and then using li and secondly you are trying to get a collection on a collection(#trade is a collection and jobs will give you a collection)
You need to do this:
<% #trades.each do |trade| %>
// this will give a single trade present in #trades
<tr>
<td>
<%= trade.name %></br>
<ul>
<% trade.jobs.each do |job| %>
// this will give a job associated with your trade, notice it's trade and not #trade
<li><%= job.name %></li>
<% end %>
</ul>
</td>
<td><%= link_to 'Show', trade %></td>
</tr>
<% end %>

Answer 2

what about your routes.rb file? I thing the error may be in there put like this in your route file
resources :trades do
resources :applications
resources :jobs
end