clean up duplicated code for creating ShowHosts

lib/radiator/podcast.ex

@@ -216,9 +216,7 @@ defmodule Radiator.Podcast do
  # Suggested to run inside a transaction.
  defp associate_hosts(show, hosts) do
  Enum.each(hosts, fn host ->
- %ShowHosts{}
- |> ShowHosts.changeset(%{show_id: show.id, user_id: host.id})
- |> Repo.insert!()
+ create_showhosts!(%{show_id: show.id, user_id: host.id})
  end)
  end
 
@@ -271,9 +269,7 @@ defmodule Radiator.Podcast do
 
  # Add users to hosts
  Enum.each(add_hosts, fn host ->
- %ShowHosts{}
- |> ShowHosts.changeset(%{show_id: show.id, user_id: host.id})
- |> Repo.insert!()
+ create_showhosts!(%{show_id: show.id, user_id: host.id})
  end)
 
  # Remove users from hosts
@@ -364,6 +360,24 @@ defmodule Radiator.Podcast do
  Repo.preload(show, fields_or_query, force: true)
  end
 
+ @doc """
+ Creates ShowHosts, the association be show and user
+
+ ## Examples
+
+ iex> create_showhosts(%{field: value})
+ %ShowHosts{}
+
+ iex> create_showhosts(%{field: bad_value})
+ {:error, %Ecto.Changeset{}}
+
+ """
+ def create_showhosts!(attrs \\ %{}) do
+ %ShowHosts{}
+ |> ShowHosts.changeset(attrs)
+ |> Repo.insert!()
+ end
+
  @doc """
  Returns the list of episodes.