amirOrbe

amirOrbe

Hi :slight_smile: ,
I am trying to save data from an appointment form in which there is a many-to-many relationship (one appointment can have many services and one service can have many appointments), in the appointment form I can select several services and I want to store the services selected in the database with the many-to-many relationship.

Here is my schema of the appointments:

defmodule MedussaStudio.Appointments.Appointment do
  alias MedussaStudio.AppointmentsServices.AppointmentService
  alias MedussaStudio.Accounts
  use Ecto.Schema
  import Ecto.Changeset

  schema "appointments" do
    field :date, :date
    field :start_time, :time
    field :end_time, :time
    belongs_to :user, Accounts.User
    many_to_many :appointment_services, MedussaStudio.Services.Service,
      join_through: AppointmentService,
      on_replace: :delete

    timestamps(type: :utc_datetime)
  end

  @doc false
  def changeset(appointment, attrs) do
    appointment
    |> cast(attrs, [:date, :start_time, :end_time, :user_id])
    |> validate_required([:date, :start_time, :end_time])
  end
end

Here is my schema of the services:

defmodule MedussaStudio.Services.Service do
  alias MedussaStudio.AppointmentsServices.AppointmentService
  use Ecto.Schema
  import Ecto.Changeset

  schema "services" do
    field :name, :string
    field :price, :decimal

    many_to_many :appointment_services, MedussaStudio.Appointments.Appointment,
      join_through: AppointmentService,
      on_replace: :delete

    timestamps(type: :utc_datetime)
  end

  @doc false
  def changeset(service, attrs) do
    service
    |> cast(attrs, [:name, :price])
    |> validate_required([:name, :price])
  end
end

And here is the function of my live view that saves the appointments:

  defp save_appointment(socket, :new, appointment_params) do
    case Appointments.create_appointment(add_user_id_to_appointment(socket, appointment_params)) do
      {:ok, appointment} ->
        %{"services" => services} = appointment_params

        id_services =
          Enum.map(services, fn service ->
            service |> String.to_integer() |> Services.get_service!()
          end)

        updated_appointment =
          appointment
          |> Repo.preload(:appointment_services)
          |> Ecto.Changeset.change()
          |> Ecto.Changeset.put_assoc(
            :appointment_services,
            id_services
          )
          |> Repo.update()

        case updated_appointment do
          {:ok, appointment} ->
            notify_parent({:saved, appointment})

            {:noreply,
             socket
             |> put_flash(:info, "Cita creada exitosamente")
             |> push_patch(to: socket.assigns.patch)}

          {:error, %Ecto.Changeset{} = changeset} ->
            {:noreply, assign_form(socket, changeset)}
        end

      {:error, %Ecto.Changeset{} = changeset} ->
        {:noreply, assign_form(socket, changeset)}
    end
  end

This is my schema of appointment services that saves the association:

defmodule MedussaStudio.AppointmentsServices.AppointmentService do
  use Ecto.Schema

  schema "appointments_services" do
    belongs_to :service, MedussaStudio.Services.Service
    belongs_to :appointment, MedussaStudio.Appointments.Appointment

    timestamps()
  end
end

And this is my error when i try to save the appointment with the appointment form data

[error] GenServer #PID<0.6405.0> terminating
** (Postgrex.Error) ERROR 42703 (undefined_column) column "id" does not exist

    query: INSERT INTO "appointments_services" ("appointment_id","service_id","inserted_at","updated_at") VALUES ($1,$2,$3,$4) RETURNING "id"
    (ecto_sql 3.11.1) lib/ecto/adapters/sql.ex:1054: Ecto.Adapters.SQL.raise_sql_call_error/1
    (ecto 3.11.1) lib/ecto/repo/schema.ex:775: Ecto.Repo.Schema.apply/4
    (ecto 3.11.1) lib/ecto/repo/schema.ex:377: anonymous fn/15 in Ecto.Repo.Schema.do_insert/4
    (ecto 3.11.1) lib/ecto/association.ex:1584: Ecto.Association.ManyToMany.on_repo_change/5
    (ecto 3.11.1) lib/ecto/association.ex:648: anonymous fn/8 in Ecto.Association.on_repo_change/7
    (elixir 1.15.4) lib/enum.ex:2510: Enum."-reduce/3-lists^foldl/2-0-"/3
    (ecto 3.11.1) lib/ecto/association.ex:644: Ecto.Association.on_repo_change/7
    (elixir 1.15.4) lib/enum.ex:2510: Enum."-reduce/3-lists^foldl/2-0-"/3
    (ecto 3.11.1) lib/ecto/association.ex:589: Ecto.Association.on_repo_change/4
    (ecto 3.11.1) lib/ecto/repo/schema.ex:955: Ecto.Repo.Schema.process_children/5
    (ecto 3.11.1) lib/ecto/repo/schema.ex:1033: anonymous fn/3 in Ecto.Repo.Schema.wrap_in_transaction/6
    (ecto_sql 3.11.1) lib/ecto/adapters/sql.ex:1358: anonymous fn/3 in Ecto.Adapters.SQL.checkout_or_transaction/4
    (db_connection 2.6.0) lib/db_connection.ex:1710: DBConnection.run_transaction/4
    (medussa_studio 0.1.0) lib/medussa_studio_web/live/appointment_live/form_component.ex:117: MedussaStudioWeb.AppointmentLive.FormComponent.save_appointment/3
    (phoenix_live_view 0.20.7) lib/phoenix_live_view/channel.ex:729: anonymous fn/4 in Phoenix.LiveView.Channel.inner_component_handle_event/4
    (telemetry 1.2.1) /Users/amir/Desktop/medussa_studio/deps/telemetry/src/telemetry.erl:321: :telemetry.span/3
    (phoenix_live_view 0.20.7) lib/phoenix_live_view/diff.ex:209: Phoenix.LiveView.Diff.write_component/4
    (phoenix_live_view 0.20.7) lib/phoenix_live_view/channel.ex:661: Phoenix.LiveView.Channel.component_handle/4
    (stdlib 5.0.2) gen_server.erl:1077: :gen_server.try_handle_info/3
    (stdlib 5.0.2) gen_server.erl:1165: :gen_server.handle_msg/6

Any help appreciated.
Thanks!

Showing Posts 1 to 2

JohnnyCurran

JohnnyCurran

Hi

What does the migration look like to create the table?

If you do not have a regular primary key on the join table, put an @primary_key false on top of the schema definition. This will tell Ecto not to assume there’s an id column on the table. Should fix the issue

amirOrbe

amirOrbe OP

Thank you :slight_smile: that works

defmodule MedussaStudio.AppointmentsServices.AppointmentService do
  use Ecto.Schema

  @primary_key false
  schema "appointments_services" do
    belongs_to :service, MedussaStudio.Services.Service
    belongs_to :appointment, MedussaStudio.Appointments.Appointment

    timestamps()
  end
end

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