ActiveRecord::UnknownAttributeError in FavoritesController#create - ruby-on-rails-4

Question

I am getting unknown attribute 'post' for Favorite. This error normally occurs when I am missing a column in a table. The error is stating this portion is where the issue lies: favorite = current_user.favorites.build(post: post). But there shouldn't be another column called post. Do I have another nested set of params I am missing perhaps that is layered under something? Or is my referential integrity incorrect?
Screenshot of error
Favorites_controller.rb file
class FavoritesController < ApplicationController
def create
post = Post.find(params[:post_id])
favorite = current_user.favorites.build(post: post)
if favorite.save
flash[:notice] = "This post is now favorited."
redirect_to [post.topic, post]
else
flash[:error] = "There was an error favoriting you post. Please try again."
redirect_to [post.topic, post]
end
end
end
Favorites schema
create_table "favorites", force: :cascade do |t|
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.integer "user_id"
t.integer "post_id"
end
Post Controller
class Post < ActiveRecord::Base
has_many :comments, dependent: :destroy
has_many :votes
has_one :summary
belongs_to :user #means the post table has the user table's primary k ey in it
belongs_to :topic
has_many :favorites
#has_one :summary
mount_uploader :avatar, AvatarUploader
#default_scope {order('created_at DESC')}
default_scope {order('rank DESC')}
validates :title, length: {minimum: 5}, presence: true
validates :body, length: {minimum: 20}, presence: true
validates :topic, presence: true
validates :user, presence: true
def create_vote
# self == post
user.votes.create(value: 1, post: self)
end
def markdown_title
(render_as_markdown).render(self.title).html_safe
end
def markdown_body
(render_as_markdown).render(self.body).html_safe
end
def up_votes
votes.where(value: 1).count
end
def down_votes
votes.where(value: -1).count
end
def points
votes.pluck(:value).sum
end
def update_rank
age_in_days = (created_at - Time.new(1970,1,1)) / (60 * 60 * 24) #1 day in seconds
new_rank = points + age_in_days
update_attribute(:rank, new_rank)
end
private
def render_as_markdown
renderer = Redcarpet::Render::HTML.new
extensions = {fenced_code_blocks: true}
redcarpet = Redcarpet::Markdown.new(renderer, extensions)
return redcarpet
end
end
Post table schema
create_table "posts", force: :cascade do |t|
t.string "title"
t.text "body"
t.datetime "created_at"
t.datetime "updated_at"
t.integer "user_id"
t.integer "topic_id"
t.string "avatar"
t.float "rank"
end
Favorites route
rake routes | grep -i favorites
post_favorites POST /posts/:post_id/favorites(.:format) favorites#create
post_favorite DELETE /posts/:post_id/favorites/:id(.:format) favorites#destroy

Answer 1

This line
favorite = current_user.favorites.build(post: post)
should be
favorite = current_user.favorites.build(post_id: post.id)
Because you have post_id in your favourites table not post.