How to add foreign key value on controller create in a partial

Question

I have asked a similar question but the answer involved using current_user. This question is a little bit different. I have a simple database where users can create a category. Each category has many tasks. I would like the user to click on a category to see the tasks for that category. The relationship between user and category is 1 to many and the relationship between category and task is one to many as well.

The problem I am having is in the creation of the foreign key in the task so it can tell which category it belongs to. The task create occurs when a user clicks a category

My model is as follows

category.rb

class Category < ActiveRecord::Base
    has_many :tasks
    belongs_to :users
end

task.rb

class Task < ActiveRecord::Base
    belongs_to :categories
end

The controller

 def create
    @task = Task.new(task_params)
    respond_to do |format|
      if @task.save
        format.html { redirect_to @task, notice: 'Task was successfully created.' }
        format.json { render :show, status: :created, location: @task }
        render :layout => false
      else
        format.html { render :new }
        format.json { render json: @task.errors, status: :unprocessable_entity }
        render :layout => false
      end
    end
  end

I think the problem is what I use for task_params. Currently I have no method for this. How do I get the category foreign key inserted into task when a user creates a task?

Your belongs_to associations are wrong FYI and also you don't have belongs_to :category in Task model. And where does entry_params come from? — Pavan
– Pavan, Commented Jul 18, 2015 at 8:37
Pavan is right - you need to add belongs_to :category in your task. Then in the task creation you can pass the category either by setting @task.category, or by providing the id in the task_params. — Julia Will
– Julia Will, Commented Jul 18, 2015 at 9:07
OK I changed the code- my mistake. How would I pass the id in task_params? Could you show me the line? — Sebastian Zeki
– Sebastian Zeki, Commented Jul 18, 2015 at 9:09

Pavan · Accepted Answer · 2015-07-18 11:59:02Z

0

First change your belongs_to associations to singular.

belongs_to :user #in category.rb
belongs_to :category #in task.rb

Then in your create method, define a instance variable for category like below

@category = Category.find(params[:category_id]) and change your create method like below

def create
  @category = Category.find(params[:category_id])
  @task = Task.new(task_params)
  @task.category_id = @category.id
  respond_to do |format|
    if @task.save
      format.html { redirect_to @task, notice: 'Task was successfully created.' }
      format.json { render :show, status: :created, location: @task }
      render :layout => false
    else
      format.html { render :new }
      format.json { render json: @task.errors, status: :unprocessable_entity }
      render :layout => false
    end
  end
end

And make sure you have :category_id in task_params method.

Update:

You should also have a task_params method defined in your controller like below.

def task_params
  params.require(:task).permit(:id, :blobby, :challenge_id, :category_id)
end

edited Jul 18, 2015 at 11:59

answered Jul 18, 2015 at 9:21

Pavan

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9 Comments

Sebastian Zeki Over a year ago

Hi Pavan. When you say 'And make sure you have :category_id in task_params method' does that mean that in the task.rb I should have def task_params task_params= :category_id end?

Pavan Over a year ago

@SebastianZeki No! In your tasks_controller, task_params, you should be having :category_id.

Sebastian Zeki Over a year ago

so task = Task.new(task_params) should be task = Task.new(:category_id) in the code above Task should be @task but can only use sign once in this box

Pavan Over a year ago

@SebastianZeki No man! Do you have task_prams method? If so please post it in the question and i will explain.

Sebastian Zeki Over a year ago

No I don't have a task_params method. I did say in the question that I didn't know how I should do this

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