Postgrex Error 42P01 relation "characters" does not exist

I’m running into this error

** (Postgrex.Error) ERROR 42P01 (undefined_table) relation "characters" does not exist 

when I try to insert a character into the DB.

Steps taken:

Creating a movie:

alias Friends.{Movie, Character, Repo}

movie = %Movie{title: "Ready Player One", tagline: "Something about video games"}

Inserting the movie:
movie = Repo.insert!(movie)

Creating a character

character = Ecto.build_assoc(movie, :characters, %{name: "Wade Watts"})

Inserting a character


18:03:52.358 [debug] QUERY ERROR db=0.0ms queue=5.5ms idle=1209.5ms
INSERT INTO "characters" ("movie_id","name") VALUES ($1,$2) RETURNING "id" [1, "Bruce"]
** (Postgrex.Error) ERROR 42P01 (undefined_table) relation "characters" does not exist

    query: INSERT INTO "characters" ("movie_id","name") VALUES ($1,$2) RETURNING "id"
    (ecto_sql 3.7.2) lib/ecto/adapters/sql.ex:760: Ecto.Adapters.SQL.raise_sql_call_error/1
    (ecto 3.7.2) lib/ecto/repo/schema.ex:744: Ecto.Repo.Schema.apply/4
    (ecto 3.7.2) lib/ecto/repo/schema.ex:367: anonymous fn/15 in Ecto.Repo.Schema.do_insert/4
    (ecto 3.7.2) lib/ecto/repo/schema.ex:269: Ecto.Repo.Schema.insert!/4

Output from:
mix do ecto.drop, ecto.create, ecto.migrate

The database for Friends.Repo has been dropped
The database for Friends.Repo has been created

17:59:56.273 [info]  == Running 20220316202504 Friends.Repo.Migrations.CreatePeople.change/0 forward

17:59:56.278 [info]  create table people

17:59:56.297 [info]  == Migrated 20220316202504 in 0.0s

17:59:56.342 [info]  == Running 20220316223207 Friends.Repo.Migrations.CreateMovies.change/0 forward

17:59:56.342 [info]  create table movies

17:59:56.356 [info]  == Migrated 20220316223207 in 0.0s

17:59:56.364 [info]  == Running 20220316224808 Friends.Repo.Migrations.CreateCharacters.change/0 forward

17:59:56.364 [info]  create table charaters

17:59:56.372 [info]  == Migrated 20220316224808 in 0.0s

17:59:56.380 [info]  == Running 20220317003543 Friends.Repo.Migrations.CreateDistributors.change/0 forward

17:59:56.380 [info]  create table distributors

17:59:56.388 [info]  create index distributors_movie_id_index

17:59:56.394 [info]  == Migrated 20220317003543 in 0.0s

17:59:56.402 [info]  == Running 20220318020506 Friends.Repo.Migrations.CreateActors.change/0 forward

17:59:56.402 [info]  create table actors

17:59:56.414 [info]  == Migrated 20220318020506 in 0.0s

17:59:56.421 [info]  == Running 20220318020901 Friends.Repo.Migrations.CreateMoviesActors.change/0 forward

17:59:56.421 [info]  create table movies_actors

17:59:56.429 [info]  create index movies_actors_movie_id_actor_id_index

17:59:56.435 [info]  == Migrated 20220318020901 in 0.0s

movie schema:

defmodule Friends.Movie do
  use Ecto.Schema

  schema "movies" do
    field(:title, :string)
    field(:tagline, :string)
    has_many(:characters, Friends.Character)
    has_one(:distributor, Friends.Distributor)
    many_to_many(:actors, Friends.Actor, join_through: "movies_actors")

character schema`

defmodule Friends.Character do
  use Ecto.Schema

  schema "characters" do
    field(:name, :string)
    belongs_to(:movie, Friends.Movie)

*The project is from the Ecto Elixir School tutorial

It looks like you have a typo here. This says “charaters” but should be “characters”.

In the future, you can also psql your_database_here and then type \l to have it list the tables that exist, which can help make it easier to see typos like this.


Thanks for the solution and debugging tips.