Rails link_to path - ruby-on-rails

Question

I am trying to make an app in Rails 4.
I have 3 models: Project, Project_Question, Project_Answer
The associations are:
Project:
has_many :project_questions
and accepts nested attributes for project questions.
Project Question:
belongs_to :project
has_one :project_answer
and accepts nested attributes for Project Answers.
My routes are nested as follows:
resources :projects do
resources :project_questions do
resources :project_answers
end
end
In my Project Questions partial, I want a link to answer the question. I've tried:
<%= link_to 'Answer this question', new_project_project_question_project_answer_path(:project_question_id => project_question.id) %>
I have a route with that name in my routes file, but I'm getting this error message:
undefined local variable or method `project_question' for #<#<Class:0x0000010742b9d8>:0x0000010f810b68>
What should go in the brackets?
View:
<div class="containerfluid">
<div class="row">
<div class="col-md-10 col-md-offset-1">
<% #project.project_questions.each do |singleQuestion| %>
<div class="categorytitle">
<%= singleQuestion.title %>
</div>
<div class="generaltext">
<%= singleQuestion.try(:content) %>
</div>
<span class="editproject">
<% if current_user.id == #project.creator_id %>
<%= link_to 'Answer this question', new_project_project_questions_project_answer_path(:project_question_id => project_question.id) %>
<% end %>
</span>
<% end %>
</div>
</div>
</div>
Project Question controller:
class ProjectQuestionsController < ApplicationController
before_action :set_project_question, only: [:show, :edit, :update, :destroy]
# GET /project_questions
# GET /project_questions.json
def index
#project_questions = ProjectQuestion.all
end
# GET /project_questions/1
# GET /project_questions/1.json
def show
end
# GET /project_questions/new
def new
#project_question = ProjectQuestion.new
#project = Project.find(params[:project_id])
# #project_id = params[:project_id]
#project_question.project_answers[0] = ProjectAnswer.new
end
# GET /project_questions/1/edit
def edit
end
# POST /project_questions
# POST /project_questions.json
def create
#project_question = ProjectQuestion.new(project_question_params)
#project_question.project_id = project_question_params[:project_id]
respond_to do |format|
if #project_question.save
format.html { redirect_to project_url(Project.find(project_question_params[:project_id])), notice: 'Project question was successfully created.' }
format.json { render action: 'show', status: :created, location: #project_question }
else
format.html { render action: 'new' }
format.json { render json: #project_question.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /project_questions/1
# PATCH/PUT /project_questions/1.json
def update
respond_to do |format|
if #project_question.update(project_question_params)
format.html { redirect_to #project_question, notice: 'Project question was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: 'edit' }
format.json { render json: #project_question.errors, status: :unprocessable_entity }
end
end
end
# DELETE /project_questions/1
# DELETE /project_questions/1.json
def destroy
#project_question.destroy
respond_to do |format|
format.html { redirect_to project_questions_url }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_project_question
#project_question = ProjectQuestion.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def project_question_params
params[:project_question].permit(:id, :title, :content, :project_id, :user_id,
project_answer_atttibutes: [:id, :answer, :project_question_id, :user_id]
)
end
end

Answer 1

When you run rake routes, you will find this one
new_project_project_question_project_answer GET /projects/:project_id/project_questions/:project_question_id/project_answers/new(.:format) project_answers#new
That means it requires :project_id and :project_question_id as keys.
This should work
<%= link_to 'Answer this question', new_project_project_question_project_answer_path(:project_id => #project.id, :project_question_id => singleQuestion.id) %>
Notice new_project_project_question_project_answer_path not new_project_project_questions_project_answer_path

Answer 2

Your link_to should be something below
<%= link_to 'Answer this question', new_project_project_questions_project_answer_path(:project_id => #project.id, :project_question_id => singleQuestion.id) %>
View will look like below
<div class="containerfluid">
<div class="row">
<div class="col-md-10 col-md-offset-1">
<% #project.project_questions.each do |singleQuestion| %>
<div class="categorytitle">
<%= singleQuestion.title %>
</div>
<div class="generaltext">
<%= singleQuestion.try(:content) %>
</div>
<span class="editproject">
<% if current_user.id == #project.creator_id %>
<%= link_to 'Answer this question', new_project_project_questions_project_answer_path(:project_question_id => singleQuestion.id) %>
<% end %>
</span>
<% end %>
</div>
</div>
</div>
Check that params
def project_question_params
params[:project_question].permit(:id, :title, :content, :project_id, :user_id,
project_answer_atttibutes: [:id, :answer, :project_question_id, :user_id]
)
end
There is project_id
and you did not pass it in link_to
so it thwos new errormissing required keys: [:project_id]