Multiple Checkbox in Ruby

I'm trying to create an "ingredient" checkbox list derived from my "recipes", I'd like for the values to be saved in the database so that when it's checked and I refresh the page, it still shows as checked.

The error says "uninitialized constant #Class:0x00007f8f2d360830::Parties"

Here's an example of what i am trying to do

Controller:

# parties_controller.rb

def ingredients
  @party = Party.find(params[:party_id])
  @party_recipe = @party.recipes
  @party_recipe.each do |recipe|
  @ingredients = recipe.ingredients
end

The models:

Party model

#party.rb

class Party < ApplicationRecord
  has_many :party_recipes
  has_many :recipes, through: :party_recipes
end

Recipe model

#recipe_ingredient.rb

class RecipeIngredient < ApplicationRecord
 belongs_to :recipe
 belongs_to :ingredient
end

Ingredient model

#ingredient.rb

class Ingredient < ApplicationRecord
 has_many :recipe_ingredients
 has_many :recipes, through: :recipe_ingredients
end

Form:

#ingredients.html.erb

<% form_for "/parties/#{@party.id}/ingredients" do |f| %>
  <% Parties::Recipes::Ingredients.each do |ingredient| %>
    <%= check_box_tag(ingredient) %>
    <%= ingredient %>
  <% end %>
<% end %>

Schema:

create_table "ingredients", force: :cascade do |t|
    t.string "name"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
  end

  create_table "parties", force: :cascade do |t|
    t.string "title"
    t.string "address"
    t.bigint "user_id", null: false
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
    t.string "theme"
    t.date "date"
    t.integer "attendancy"
    t.integer "appetizers"
    t.integer "mains"
    t.integer "desserts"
    t.string "status", default: "pending"
    t.index ["user_id"], name: "index_parties_on_user_id"
  end

  create_table "party_recipes", force: :cascade do |t|
    t.bigint "recipe_id", null: false
    t.bigint "party_id", null: false
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
    t.index ["party_id"], name: "index_party_recipes_on_party_id"
    t.index ["recipe_id"], name: "index_party_recipes_on_recipe_id"
  end

  create_table "recipe_ingredients", force: :cascade do |t|
    t.bigint "recipe_id", null: false
    t.bigint "ingredient_id", null: false
    t.string "amount"
    t.boolean "included", default: false
    t.index ["ingredient_id"], name: "index_recipe_ingredients_on_ingredient_id"
    t.index ["recipe_id"], name: "index_recipe_ingredients_on_recipe_id"
  end

  create_table "recipes", force: :cascade do |t|
    t.string "title"
    t.text "description"
  end

add_foreign_key "party_recipes", "parties"
add_foreign_key "party_recipes", "recipes"
add_foreign_key "recipe_ingredients", "ingredients"
add_foreign_key "recipe_ingredients", "recipes"

I'm not entirely sure where exactly needs to be corrected, any help appreciated, thank you so much!