Unknown attribute when linking two models together - ruby-on-rails

Question

Brief overview of my app.
It's quite basic in that the User first of all creates a set A client on one page and then uses another to create and assign jobs to the user.
My Client model and view are working as expected but im unable to link my jobs model.
Here is my jobs model.
class Client < ActiveRecord::Base
has_and_belongs_to_many :jobs
end
class Job < ActiveRecord::Base
has_and_belongs_to_many :clients
end
Here is also my clients controller.
class JobsController < ApplicationController
def index
#jobs = Job.find(:all)
respond_to do |format|
format.html # index.html.erb
format.xml { render :xml => #job }
end
end
def new
#jobs = Job.new
respond_to do |format|
format.html # index.html.erb
format.xml { render :xml => #job }
end
end
def create
#jobs = Job.new(params[:job])
respond_to do |format|
if #jobs.save
format.html { redirect_to #jobs, notice: 'Job was successfully created.' }
format.json { render json: #jobs, status: :created, location: #jobs }
else
format.html { render action: "new" }
format.json { render json: #jobs.errors, status: :unprocessable_entity }
end
end
end
def show
#jobs = Job.find(params[:id])
respond_to do |format|
format.html # show.html.erb
format.json { render json: #jobs }
end
end
end
In my form I have two fields. One for the job name and another which is a drop down on all the clients listed in the database.
When fill this out however and I press save im getting the following error.
ActiveRecord::UnknownAttributeError in JobsController#create
**unknown attribute: client_id**
Application Trace | Framework Trace | Full Trace
app/controllers/jobs_controller.rb:22:in `new'
app/controllers/jobs_controller.rb:22:in `create'
Request
Parameters:
{"utf8"=>"✓",
"authenticity_token"=>"0ZVYpM9vTgY+BI55Y9yJDwCJwrwSgGL9xjHq8dz5OBE=",
"job"=>{"name"=>"Sample Monthly",
"client_id"=>"1"},
"commit"=>"Save Job"}
I have a junction table setup called clients_jobs also..
class AddClientsJobsTable < ActiveRecord::Migration
def up
create_table :clients_jobs, :id => false do |t|
t.belongs_to :job, :client
t.integer :client_id
t.integer :job_id
end
end
def down
drop_table :clients_jobs
end
end
I assume I need to declare client_id
somewhere but this is my first Rails app and im not sure where.
Any help would be greatly appreciated.
Edit: Here's my Job's form.
<%= simple_form_for :job do |f| %>
<%= f.input :name %>
<%= select("job", "client_id", Client.all.collect {|c| [ c.name, c.id ] }, {:include_blank => 'None'})%>
<%= f.button :submit %>
<% end %>

Answer 1

Your model states that job - client is a habtm association, but your form implements as if job belongs to (one) client. If indeed your intention is to be able to assign a job to multiple clients, your for should look something like:
<%= collection_select(:job, :client_ids, Client.all, :id, :name, {:include_blank => 'None'}, { :multiple => true }) %>
note plural 'client_ids' and allowing multiple in the input.
If a job belongs to only one user, you should not use has_and_belongs_to_many :clients.