defmodule Mobilizon.Media do @moduledoc """ The Media context. """ import Ecto.Query alias Ecto.Multi alias Mobilizon.Media.{File, Picture} alias Mobilizon.Storage.Repo @doc """ Gets a single picture. """ @spec get_picture(integer | String.t()) :: Picture.t() | nil def get_picture(id), do: Repo.get(Picture, id) @doc """ Gets a single picture. Raises `Ecto.NoResultsError` if the picture does not exist. """ @spec get_picture!(integer | String.t()) :: Picture.t() def get_picture!(id), do: Repo.get!(Picture, id) @doc """ Get a picture by it's URL. """ @spec get_picture_by_url(String.t()) :: Picture.t() | nil def get_picture_by_url(url) do url |> picture_by_url_query() |> Repo.one() end @doc """ Creates a picture. """ @spec create_picture(map) :: {:ok, Picture.t()} | {:error, Ecto.Changeset.t()} def create_picture(attrs \\ %{}) do %Picture{} |> Picture.changeset(attrs) |> Repo.insert() end @doc """ Updates a picture. """ @spec update_picture(Picture.t(), map) :: {:ok, Picture.t()} | {:error, Ecto.Changeset.t()} def update_picture(%Picture{} = picture, attrs) do picture |> Picture.changeset(attrs) |> Repo.update() end @doc """ Deletes a picture. """ @spec delete_picture(Picture.t()) :: {:ok, Picture.t()} | {:error, Ecto.Changeset.t()} def delete_picture(%Picture{} = picture) do transaction = Multi.new() |> Multi.delete(:picture, picture) |> Multi.run(:remove, fn _repo, %{picture: %Picture{file: %File{url: url}}} -> MobilizonWeb.Upload.remove(url) end) |> Repo.transaction() case transaction do {:ok, %{picture: %Picture{} = picture}} -> {:ok, picture} {:error, :remove, error, _} -> {:error, error} end end @spec picture_by_url_query(String.t()) :: Ecto.Query.t() defp picture_by_url_query(url) do from( p in Picture, where: fragment("? @> ?", p.file, ~s|{"url": "#{url}"}|) ) end end