title: PG::UndefinedColumn: ERROR: column comments.post_id does not exist
body: <p>I cant seem to figure out why I keep getting this error. I am trying to add comment forms to a blog I am making and it wont work. Here is what the full error says.</p>
  
  <p>ActiveRecord::StatementInvalid in Posts#show</p>
  
  <p>Showing /Users/ipbyrne/FirstRailsApp/blog/app/views/posts/show.html.erb where line #17 raised:</p>
  
  <p>PG::UndefinedColumn: ERROR:  column comments.post_id does not exist
  LINE 1: SELECT COUNT(<em>) FROM "comments"  WHERE "comments"."post_id" ...
                                                 ^
  : SELECT COUNT(</em>) FROM "comments"  WHERE "comments"."post_id" = $1</p>
  
  <pre><code>&lt;/p&gt;
  
     &lt;div id="comments"&gt;
         &lt;h2&gt;&lt;%= @post.comments.count %&gt; Comments&lt;/h2&gt; &lt;-- Says it breaks here
         &lt;%= render @post.comments %&gt;
  
         &lt;h3&gt;Add a comment:&lt;/h3&gt;
  </code></pre>
  
  <p>From what i can understand there is a column missing in one of the tables in the schema.rb file? Incase this the case here is what mine looks like</p>
  
  <pre><code># encoding: UTF-8
  # This file is auto-generated from the current state of the database. Instead
  # of editing this file, please use the migrations feature of Active Record to
  # incrementally modify your database, and then regenerate this schema definition.
  #
  # Note that this schema.rb definition is the authoritative source for your
  # database schema. If you need to create the application database on another
  # system, you should be using db:schema:load, not running all the migrations
  # from scratch. The latter is a flawed and unsustainable approach (the more migrations
  # you'll amass, the slower it'll run and the greater likelihood for issues).
  #
  # It's strongly recommended that you check this file into your version control system.
  
  ActiveRecord::Schema.define(version: 20140911230918) do
  
    create_table "comments", force: true do |t|
      t.string   "name"
      t.text     "body"
      t.integer  "post_id"
      t.datetime "created_at"
      t.datetime "updated_at"
    end
  
    add_index "comments", ["post_id"], name: "index_comments_on_post_id"
  
    create_table "posts", force: true do |t|
      t.string   "title"
      t.text     "body"
      t.datetime "created_at"
      t.datetime "updated_at"
    end
  
    create_table "users", force: true do |t|
      t.string   "email",                  default: "", null: false
      t.string   "encrypted_password",     default: "", null: false
      t.string   "reset_password_token"
      t.datetime "reset_password_sent_at"
      t.datetime "remember_created_at"
      t.integer  "sign_in_count",          default: 0,  null: false
      t.datetime "current_sign_in_at"
      t.datetime "last_sign_in_at"
      t.string   "current_sign_in_ip"
      t.string   "last_sign_in_ip"
      t.datetime "created_at"
      t.datetime "updated_at"
    end
  
    add_index "users", ["email"], name: "index_users_on_email", unique: true
    add_index "users", ["reset_password_token"], name: "index_users_on_reset_password_token", unique: true
  
  end
  </code></pre>