Rails 4, saving attributes nested - ruby-on-rails

Question

I have a model Job. A job require many skills. But when I'm trying to save my job it fails. I'm not sure I understand what I'm doing wrong.
My models:
class Skill < ActiveRecord::Base
has_many :job_skills
has_many :jobs, through: :job_skills
end
class JobSkill < ActiveRecord::Base
belongs_to :skill
belongs_to :job
end
class Job < ActiveRecord::Base
has_many :job_skills, :inverse_of => :job
has_many :skills, through: :job_skills
accepts_nested_attributes_for :job_skills
end
My view:
<%= form_for #job do |f| %>
<div class="row">
<div class="col-md-8">
<h4>General informations</h4>
<br />
<div class="form-group">
<%= f.label :title %>
<%= f.text_field :title, :autofocus => true, class:'form-control' %>
</div><br />
<%= f.fields_for :job_skills do |s| %>
<%= s.text_field :id %>
<% end %>
</div>
</div>
<div class="submit" style="position:relative;">
<%= f.submit "Save", class: 'button button-small' %>
</div>
<% end %>
My controller:
class JobsController < ApplicationController
before_filter :authenticate_user!, :has_company?, :except => [:index, :show]
def create
#job = Job.new(job_params)
#job.company_id = current_user.company_id
#job.user_id = current_user.id
if #job.save
flash[:notice] = "This job offer has been saved."
return redirect_to job_path(#job)
else
flash[:error] = #job.errors.full_messages.to_sentence
render action: :new
end
end
def new
if current_user.company.present?
#job = Job.new(email:current_user.email)
#job.job_skill.build
else
flash[:error] = "You need to create a company before posting a job"
return redirect_to new_company_path()
end
end
private
def job_params
params.require(:job).permit(:status, :title, :description, :remote ,:job_type, :visa_sponsor, :email, :salary_max, :salary_min, :country, :state, :city, job_skill_attributes: [:id])
end
end
So, I'm not sure what I'm doing wrong, when I'm trying to save I get the following error:
#job = Job.new(job_params)
ActiveRecord::RecordNotFound Exception:
Couldn't find Skill with ID=4 for Job with ID= nil

Answer 1

Your pieces of code are a bit confusing for me.
It seems, that you want to create a job and define, what skills are needed for this job.
Why do you need nested attributes?
Normally, you
either edit a list of all the skills, that are probably needed for a job and then assign the propper skills to that job, than you have a has_and_belongs_to_many relationship and can use form helpers for collections. In this case, you don't need a model JobSkill (but a table jobs_skills to store the relationship and is handles transparently by Rails)
or add random skills to a job, then your job has_may :skills and every skill belongs to exactly one job. Here you can use nested attributes. And then you need a way to add nested skill instances i.e. with cocoon. Again, you don't need a model JobSkill.
Which one is your usecase, so I can explain it in more detail.