I am struggling with the error message no case clause matching: {1234567890, :graphemes}. The following are excepts from my code:

defmodule Agency.Client do
  use Ecto.Schema
  import Ecto.Changeset

  schema "clients" do
    field(:name, :string)
    field(:address, :string)
    field(:contact, :string)
    field(:tel_number, :integer)
    timestamps()
  end

  def changeset(client, params \\ %{}) do
    client
    |> cast(params, [:name, :address, :contact, :tel_number])
    |> validate_required([:name, :address, :contact, :tel_number])
    |> validate_length(:name, min: 3)
    |> validate_length(:address, min: 5)
    |> validate_length(:contact, min: 3)
    |> validate_length(:tel_number, min: 8)
    |> validate_change(:name, &validate/2)
  end
end

defmodule Agency do
  alias Agency.{Client, Role}

  @repo Agency.Repo

  def insert_client(attrs) do
    %Client{}
    |> Client.changeset(attrs)
    |> @repo.insert()
  end
end

defmodule AgencyWeb.ClientController do
  use AgencyWeb, :controller

  def index(conn, _params) do
    clients = Agency.list_clients()
    render(conn, "index.html", clients: clients)
  end

  def new(conn, _params) do
    client = Agency.new_client()
    render(conn, "new.html", client: client)
  end

  def create(conn, %{"client" => client_params}) do
    {:ok, _client} = Agency.insert_client(client_params)
    redirect(conn, to: Routes.client_path(conn, :index))
  end
end

new.html.eex

<h1>New Client</h1>

<%= form_for @client, Routes.client_path(@conn, :create), fn f -> %>
  <%= label f, :name %>
  <%= text_input f, :name %>

  <%= label f, :address %>
  <%= text_input f, :address %>

  <%= label f, :contact %>
  <%= text_input f, :contact %>

  <%= label f, :tel_number, "Tel Number" %>
  <%= telephone_input f, :tel_number %>

  <div>
    <%= submit "Submit" %>
  </div>

<% end %>

Params

client

    %{"address" => "fsdfsdfs", "contact" => "sdfsdfsd", "name" => "sdfsfdsf", "tel_number" => "0123456789"}

I think its got something to do with converting string to integer but isn’t Ecto.Changeset.cast supposed to do that?