undefined method `create_schema' for Nuts::Models:Module (NoMethodError)

[tablecell]

test.rb

require "camping"
require "active_record"

Base = ActiveRecord::Base

module Nuts
  module Models
    class Post < Base
      belongs_to :user
    end

    class Comment < Base; belongs_to :user; end
    class User < Base; end

    #class BasicFields < V 1.1
    class BasicFields < ActiveRecord::Migration[4.2]
      def self.up
        create_table :blog_posts, :force => true do |t|
          t.integer :user_id, :null => false
          t.string :title, :limit => 255
          t.text :body, :html_body
          t.timestamps
        end
        create_table :blog_users, :force => true do |t|
          t.string :username, :password
        end
        create_table :blog_comments, :force => true do |t|
          t.integer :post_id, :null => false
          t.string :username
          t.text :body, :html_body
          t.timestamps
        end
        User.create :username => "admin", :password => "camping"
      end

      def self.down
        drop_table :blog_posts
        drop_table :blog_users
        drop_table :blog_comments
      end
    end
  end
end

def Nuts.create
  Nuts::Models.create_schema
end

Camping::Models::Base.establish_connection :adapter => "sqlite3", :database => "example.db"

Nuts.create