Rails NoMethodError: undefined method `name' for "#<RecipeType:0x000055cd000b18a0>":String

user_11912828 0
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I've been having trouble to do a challenge with Active Records, I read the documentation, and seen other examples with belongs_to that I remade and worked, I have no clue anymore about what I'm doing wrong here when I try to call recipe.recipe_type.name I get the error Rails NoMethodError: undefined method `name' for "#":String

schema.rb


  create_table "recipe_types", force: :cascade do |t|
    t.string "name"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
    t.integer "recipe_type_id"
    t.index ["recipe_type_id"], name: "index_recipe_types_on_recipe_type_id"
  end

  create_table "recipes", force: :cascade do |t|
    t.string "title"
    t.string "cuisine"
    t.string "difficulty"
    t.integer "cook_time"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
    t.text "ingredients"
    t.text "cook_method"
  end
end

migrations

  def change
    create_table :recipes do |t|
      t.string :title
      t.string :cuisine
      t.string :difficulty
      t.integer :cook_time

      t.timestamps
    end
  end
end

class AddFieldsToRecipe < ActiveRecord::Migration[5.2]
  def change
    add_column :recipes, :ingredients, :text
    add_column :recipes, :cook_method, :text
  end
end

class CreateRecipeTypes < ActiveRecord::Migration[5.2]
  def change
    create_table :recipe_types do |t|
      t.string :name

      t.timestamps
    end
  end
end

class AddRecipeRefToRecipeType < ActiveRecord::Migration[5.2]
  def change
    add_reference :recipe_types, :recipe_type, foreign_key: true
  end
end
rails-activerecord ruby-on-rails ruby
2 Answers

You seemed to have added the recipe_type reference to the wrong table. Your last migration should probably have been

add_reference :recipes, :recipe_type, foreign_key: true

because as it is, you have added the reference_type reference to ReferenceType.

user_5115580

So the final schema was:

ActiveRecord::Schema.define(version: 2020_03_26_013134) do

  create_table "recipe_types", force: :cascade do |t|
    t.string "name"
    t.integer "recipe_id"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
    t.index ["recipe_id"], name: "index_recipe_types_on_recipe_id"
  end

  create_table "recipes", force: :cascade do |t|
    t.string "title"
    t.string "cuisine"
    t.string "difficulty"
    t.integer "cook_time"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
    t.text "ingredients"
    t.text "cook_method"
    t.integer "recipe_type_id"
    t.index ["recipe_type_id"], name: "index_recipes_on_recipe_type_id"
  end
end

and with

models/recipe_type

class RecipeType < ApplicationRecord
    has_many :recipes
end

models/recipe

class Recipe < ApplicationRecord
  belongs_to :recipe_type
end

You can start a simple has_many belongs_to active record association, I hope this helps as many people as those who helped me, in the beginning of this journey, strongly recommend to study db:migrate, db:rollback, db:create and db:drop for those who encounter some trouble.

user_119128280
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