Show data from join table ruby on rails - ruby-on-rails

Question

I was trying to show the student name on the submission table but I don't know how to do it. If you can please help me!
Form.rb:
class Form < ActiveRecord::Base
belongs_to :user
has_many :submissions, :dependent => :destroy
has_attached_file :image, styles: { medium: "400x600>" }
validates_attachment_content_type :image, content_type: /\Aimage\/.*\z/
end
Submission.rb:
class Submission < ActiveRecord::Base
belongs_to :form
has_many :submissionstudent
has_many :students, :through => :submissionstudent
end
Student.rb:
class Student < ActiveRecord::Base
has_many :submissionstudent
has_many :submissions, :through => :submissionstudent
end
Joint Table: Submissionstudent:
class Submissionstudent < ActiveRecord::Base
belongs_to :submission
belongs_to :student
end
Show Table:
<h1><%= #form.title %></h1>
<p>
<%= image_tag #form.image.url(:medium) %>
</p>
<table class="table table-responsive table-hover">
<% if user_signed_in? %>
<% if #submissions.blank? %>
<h4>No submission just yet</h4>
<% else %>
<thead>
<th>Conflict</th>
<th>Computer</th>
<th>Extra time</th>
<th>AM or PM</th>
</thead>
<tbody>
<% #submissions.each do |submission| %>
<tr>
<td><%= submission.conflict %></td>
<td><%= submission.computer %></td>
<td><%= submission.extra_time %>%</td>
<td><%= submission.am_pm %></td>
<!-- Need to add Edit, Delete -->
</tr>
<% end %>
</tbody>
<% end %>
<% end %>
</table>
<%= link_to 'New Submission', new_form_submission_path(#form) %>
<br>
<%= link_to 'Edit', edit_form_path(#form) %> |
<%= link_to 'Back', forms_path(#form) %>
Submission Controller:
class SubmissionsController < ApplicationController
before_action :set_submission, only: [:show, :edit, :update, :destroy]
before_action :set_form
# GET /submissions/new
def new
#submission = Submission.new
#all_students = Student.all
#submission_student = #submission.submissionstudent.build
end
# GET /submissions/1/edit
def edit
end
# POST /submissions
# POST /submissions.json
def create
#submission = Submission.new(submission_params)
#submission.form_id = #form.id
respond_to do |format|
if #submission.save
format.html { redirect_to #form, notice: 'Submission was successfully created.' }
format.json { render :show, status: :created, location: #submission }
else
format.html { render :new }
format.json { render json: #submission.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /submissions/1
# PATCH/PUT /submissions/1.json
def update
respond_to do |format|
if #submission.update(submission_params)
format.html { redirect_to #submission, notice: 'Submission was successfully updated.' }
format.json { render :show, status: :ok, location: #submission }
else
format.html { render :edit }
format.json { render json: #submission.errors, status: :unprocessable_entity }
end
end
end
# DELETE /submissions/1
# DELETE /submissions/1.json
def destroy
#submission.destroy
respond_to do |format|
format.html { redirect_to submissions_url, notice: 'Submission was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_submission
#submission = Submission.find(params[:id])
end
def set_form
#form = Form.find(params[:form_id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def submission_params
params.require(:submission).permit(:conflict, :computer, :extra_time, :am_pm)
end
end
Form Controller:
class FormsController < ApplicationController
before_action :set_form, only: [:show, :edit, :update, :destroy]
before_action :authenticate_user!, except: [:index, :show]
def index
#forms = Form.all
end
def show
#submissions = Submission.where(form_id: #form.id).order("conflict DESC")
#student = Student.find params[:id]
end
def new
#form = current_user.forms.build
end
def edit
end
def create
#form = current_user.forms.build(form_params)
respond_to do |format|
if #form.save
format.html { redirect_to #form, notice: 'Form was successfully created.' }
format.json { render :show, status: :created, location: #form }
else
format.html { render :new }
format.json { render json: #form.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /forms/1
# PATCH/PUT /forms/1.json
def update
respond_to do |format|
if #form.update(form_params)
format.html { redirect_to #form, notice: 'Form was successfully updated.' }
format.json { render :show, status: :ok, location: #form }
else
format.html { render :edit }
format.json { render json: #form.errors, status: :unprocessable_entity }
end
end
end
# DELETE /forms/1
# DELETE /forms/1.json
def destroy
#form.destroy
respond_to do |format|
format.html { redirect_to forms_url, notice: 'Form was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_form
#form = Form.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def form_params
params.require(:form).permit(:title, :image)
end
end
Student Controller:
class StudentsController < ApplicationController
before_action :set_student, only: [:show, :edit, :update, :destroy]
# GET /students
# GET /students.json
def index
#students = Student.all
end
# GET /students/1
# GET /students/1.json
def show
end
# GET /students/new
def new
#student = Student.new
end
# GET /students/1/edit
def edit
end
# POST /students
# POST /students.json
def create
#student = Student.new(student_params)
respond_to do |format|
if #student.save
format.html { redirect_to #student, notice: 'Student was successfully created.' }
format.json { render :show, status: :created, location: #student }
else
format.html { render :new }
format.json { render json: #student.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /students/1
# PATCH/PUT /students/1.json
def update
respond_to do |format|
if #student.update(student_params)
format.html { redirect_to #student, notice: 'Student was successfully updated.' }
format.json { render :show, status: :ok, location: #student }
else
format.html { render :edit }
format.json { render json: #student.errors, status: :unprocessable_entity }
end
end
end
# DELETE /students/1
# DELETE /students/1.json
def destroy
#student.destroy
respond_to do |format|
format.html { redirect_to students_url, notice: 'Student was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_student
#student = Student.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def student_params
params.require(:student).permit(:name)
end
end
If you need something else just comment and I'll provide it
Thanks for your help.

Answer 1

Short answer is:
...
<% #submissions.each do |submission| %>
<tr>
<td><%= submission.conflict %></td>
<td><%= submission.computer %></td>
<td><%= submission.extra_time %>%</td>
<td><%= submission.am_pm %></td>
<td><%= submission.students.first.name %></td>
</tr>
<% end %>
...
Or to not get error if submission do not have a student
<td><%= submission.students.first.try(:name) %></td>
Long answer is to change the assosiation and only add a column to submissions to link a student (student_id) and delete the jointable (submissionstudent) because you always have one student per submission.
EDIT:
to show all student's name you can do some like this
<td><%= submission.students.pluck(:name).join(' - ') %></td>
or if you need more you can iterate over students
<% #submissions.each do |submission| %>
<tr>
<td><%= submission.conflict %></td>
<td><%= submission.computer %></td>
<td><%= submission.extra_time %>%</td>
<td><%= submission.am_pm %></td>
<td>
<% submission.students.each do |ss| %>
<%= ss.name %> - <%= ss.last_name %>
<% end %>
</td>
</tr>
<% end %>