undefined method `belongs_to' for ActiveRecord:Module - ruby-on-rails

Question

I am getting the following error "undefined method `belongs_to' for ActiveRecord:Module" it is showing the following code for my error in line 1.
class Posting < ActiveRecord::
belongs_to :user
validates :content, length: { maximum: 1000 }
end
Also showing an error in this code on line 10
class ProfilesController < ApplicationController
def show
if params[:id].nil? # if there is no user id in params, show current one
#user = current_user
else
#user = User.find(params[:id])
end
#alias = #user.alias
#posting = Posting.new
end
end
The postings controller if it is needed is...
class PostingsController < ApplicationController
before_action :set_posting, only: [:show, :edit, :update, :destroy]
# GET /postings
# GET /postings.json
def index
#postings = Posting.all
end
# GET /postings/1
# GET /postings/1.json
def show
end
# GET /postings/new
def new
#posting = Posting.new
end
# GET /postings/1/edit
def edit
end
# POST /postings
# POST /postings.json
def create
#posting = Posting.new(posting_params)
respond_to do |format|
if #posting.save
format.html { redirect_to #posting, notice: 'Posting was successfully created.' }
format.json { render action: 'show', status: :created, location: #posting }
else
format.html { render action: 'new' }
format.json { render json: #posting.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /postings/1
# PATCH/PUT /postings/1.json
def update
respond_to do |format|
if #posting.update(posting_params)
format.html { redirect_to #posting, notice: 'Posting was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: 'edit' }
format.json { render json: #posting.errors, status: :unprocessable_entity }
end
end
end
# DELETE /postings/1
# DELETE /postings/1.json
def destroy
#posting.destroy
respond_to do |format|
format.html { redirect_to postings_url }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_posting
#posting = Posting.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def posting_params
params.require(:posting).permit(:content, :user_id)
end
end

Answer 1

You need the Posting class to inherit from ActiveRecord::Base and not just ActiveRecord::