Vfrdtyky

I'm doing a Ruby on Rails API. I have two models plans and categories, which has a relation "many to many" so I use an intermediate table with a model called category_plans. What I want is to create a plan with many categories, and each one of them has two more attributes (kind, portion) which will be saved on the intermediate table. (I'm using Postgresql).

Category

class Category < ApplicationRecord

    has_many :category_plans

    has_many :plan, through: :category_plans

end

Plan

class Plan < ApplicationRecord

    has_many :category_plans

    has_many :category, through: :category_plans

end

CategoryPlan

class CategoryPlan < ApplicationRecord

    validates_presence_of :category, :plan



    enum kind: {

        Colacion: 'Colacion',

        Desayuno: 'Desayuno',

        Comida: 'Comida',

        Cena: 'Cena'

    }, _prefix: :kind



    belongs_to :category

    belongs_to :plan

end

These are the migrations I use:

Plan

class CreatePlans < ActiveRecord::Migration[5.2]

    def change

        create_table :plans do |t|

            t.string :name

            t.references :patient, foreign_key: true

            t.text :description

            t.datetime :deleted_at

            t.timestamps

        end

    end

end

Category

class CreateCategories < ActiveRecord::Migration[5.2]

    def change

        create_table :categories do |t|

            t.string :name

            t.timestamps

        end

    end

end

CategoryPlan

class CreateCategoryPlans < ActiveRecord::Migration[5.2]

    def up

        execute <<-SQL

            CREATE TYPE type_food AS ENUM ('Colacion', 'Desayuno', 'Comida', 

            'Cena');

        SQL



        create_table :category_plans do |t|

            t.belongs_to :category, :null => false, :index => true

            t.belongs_to :plan, :null => false, :index => true

            t.column :kind  , :type_food

            t.float :portion

        end

        add_index :category_plans, :kind

    end



    def down

        drop_column :kind, :type_food

        execute "DROP kind type_food;"

    end

end

And the controller:

class V1::PlansController < ApplicationController

    before_action :set_patient, only: [:show, :update, :destroy]



    def create

        plan = Plan.new(plan_params)

        if plan.save

            render json: {status: 'Success', message: 'Saved plan', data: 

            plan}, status: 201

        else

            render json: {status: 'Error', message: 'Plan not saved', data: 

            plan.errors}, status: :unprocessable_entity

        end

    end



    def plan_params

        params.require(:plan).permit(:name, :patient_id, :description, 

        category_plans_attributes: [:id, :kind, :portion, 

        category_attributes: [:id]])

    end



end

I'm not sure that "strong params" is right, also I'm not sure about how to do my JSON structure, at this time I got it like this:

JSON

{

    "plan": {

        "name": "Plan 8",   

        "patient_id": "3",

        "description": "Plan nuevo",

        "category_plan": {

            "kind": "Cena",

            "portion": "12.3"

        }

    } 

}

Your submitted JSON needs to be the same as the permitted attributes in plan_params

{

    "plan": {

        "name": "Plan 8",   

        "patient_id": "3",

        "description": "Plan nuevo",

        "category_plans_attributes": [{

            "kind": "Cena",

            "portion": "12.3"

        }]

    } 

}

Also you need to add the accepts_nested_attributes_for : category_plans to the Plan model.

Try that and check the rails app logs for errors if it does not succeed after this.