Rails: Sqlite3 to PostgreSQL heroku deployment Undefined Table ERROR - ruby-on-rails

Question

I've built a rails app and on pushing it up to heroku and running heroku run rake db:migrate i receive the error:
Migrating to CreateFollowingRelationships (20160615113231)
(0.4ms) BEGIN
== 20160615113231 CreateFollowingRelationships: migrating =====================
-- create_table(:following_relationships)
(7.1ms) CREATE TABLE "following_relationships" ("id" serial primary key, "follower_id" integer, "followed_user_id" integer, "created_at" timestamp NOT NULL, "updated_at" timestamp NOT NULL, CONSTRAINT "fk_rails_39102b381e"
FOREIGN KEY ("follower_id")
REFERENCES "followers" ("id")
, CONSTRAINT "fk_rails_048c8f7cd9"
FOREIGN KEY ("followed_user_id")
REFERENCES "followed_users" ("id")
)
(0.5ms) ROLLBACK
(0.5ms) SELECT pg_advisory_unlock(2837140123622957145)
rails aborted!
StandardError: An error has occurred, this and all later migrations canceled:
PG::UndefinedTable: ERROR: relation "followers" does not exist
: CREATE TABLE "following_relationships" ("id" serial primary key, "follower_id" integer, "followed_user_id" integer, "created_at" timestamp NOT NULL, "updated_at" timestamp NOT NULL, CONSTRAINT "fk_rails_39102b381e"
FOREIGN KEY ("follower_id")
REFERENCES "followers" ("id")
, CONSTRAINT "fk_rails_048c8f7cd9"
FOREIGN KEY ("followed_user_id")
REFERENCES "followed_users" ("id")
)
The relationship I have setup is for users to follow users and be followed. It works perfectly in development. This is the first time i've had this error and can't find a solution. Please see the rest of my code below.
db/schema.rb
ActiveRecord::Schema.define(version: 20160618122126) do
create_table "chats", force: :cascade do |t|
t.integer "user_id"
t.string "title"
t.text "description"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.integer "profile_id"
t.index ["profile_id"], name: "index_chats_on_profile_id"
t.index ["user_id"], name: "index_chats_on_user_id"
end
create_table "comments", force: :cascade do |t|
t.integer "profile_id"
t.integer "chat_id"
t.text "body"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.index ["chat_id"], name: "index_comments_on_chat_id"
t.index ["profile_id"], name: "index_comments_on_profile_id"
end
create_table "following_relationships", force: :cascade do |t|
t.integer "follower_id"
t.integer "followed_user_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.index ["followed_user_id"], name: "index_following_relationships_on_followed_user_id"
t.index ["follower_id"], name: "index_following_relationships_on_follower_id"
end
create_table "locations", force: :cascade do |t|
t.string "locationable_type"
t.integer "locationable_id"
t.string "suburb"
t.integer "user_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.string "address"
t.string "state"
t.string "country"
t.string "postcode"
t.float "latitude"
t.float "longitude"
t.index ["locationable_type", "locationable_id"], name: "index_locations_on_locationable_type_and_locationable_id"
t.index ["user_id"], name: "index_locations_on_user_id"
end
create_table "orders", force: :cascade do |t|
t.integer "buyer_id"
t.integer "seller_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
create_table "posts", force: :cascade do |t|
t.integer "profile_id"
t.integer "user_id"
t.string "title"
t.text "body"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.index ["profile_id"], name: "index_posts_on_profile_id"
t.index ["user_id"], name: "index_posts_on_user_id"
end
create_table "profiles", force: :cascade do |t|
t.integer "user_id"
t.text "bio"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.index ["user_id"], name: "index_profiles_on_user_id"
end
create_table "tutoring_relationships", force: :cascade do |t|
t.integer "tutor_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.integer "tutee_id"
t.index ["tutee_id"], name: "index_tutoring_relationships_on_tutee_id"
t.index ["tutor_id"], name: "index_tutoring_relationships_on_tutor_id"
end
create_table "users", force: :cascade do |t|
t.string "email", null: false
t.string "password_digest", null: false
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.string "username"
t.boolean "tutor", default: false
t.index ["email"], name: "index_users_on_email", unique: true
t.index ["username"], name: "index_users_on_username", unique: true
end
create_table "votes", force: :cascade do |t|
t.string "votable_type"
t.integer "votable_id"
t.string "voter_type"
t.integer "voter_id"
t.boolean "vote_flag"
t.string "vote_scope"
t.integer "vote_weight"
t.datetime "created_at"
t.datetime "updated_at"
t.index ["votable_id", "votable_type", "vote_scope"], name: "index_votes_on_votable_id_and_votable_type_and_vote_scope"
t.index ["voter_id", "voter_type", "vote_scope"], name: "index_votes_on_voter_id_and_voter_type_and_vote_scope"
end
end
models/following_relationship.rb
class FollowingRelationship < ApplicationRecord
belongs_to :follower, class_name: 'User'
belongs_to :followed_user, class_name: 'User'
end
models/user.rb
class User < ActiveRecord::Base
has_one :profile, dependent: :destroy
has_many :chats
validates :email, presence: true, uniqueness: true
validates :password_digest, presence: true
has_many :follower_relationships,
foreign_key: :followed_user_id,
class_name: 'FollowingRelationship'
has_many :followers, through: :follower_relationships
has_many :followed_user_relationships,
foreign_key: :follower_id,
class_name: "FollowingRelationship"
has_many :followed_users, through: :followed_user_relationships
has_many :tutee_relationships,
foreign_key: :tutor_id,
class_name: 'TutoringRelationship'
has_many :tutees, through: :tutee_relationships
has_many :tutor_relationships,
foreign_key: :tutee_id,
class_name: 'TutoringRelationship'
has_many :tutors, through: :tutor_relationships
def following? user
followed_user_ids.include?(user.id)
end
def is_connected? user
tutee_ids.include?(user.id)
end
end
Please excuse the messy model, it would usually be in a helper method but for this post it's here. If anyone has any ideas please let me know! Thanks