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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Repo do
   6   use Ecto.Repo,
   7     otp_app: :pleroma,
   8     adapter: Ecto.Adapters.Postgres,
   9     migration_timestamps: [type: :naive_datetime_usec]
  10
  11   defmodule Instrumenter do
  12     use Prometheus.EctoInstrumenter
  13   end
  14
  15   @doc """
  16   Dynamically loads the repository url from the
  17   DATABASE_URL environment variable.
  18   """
  19   def init(_, opts) do
  20     {:ok, Keyword.put(opts, :url, System.get_env("DATABASE_URL"))}
  21   end
  22
  23   @doc "find resource based on prepared query"
  24   @spec find_resource(Ecto.Query.t()) :: {:ok, struct()} | {:error, :not_found}
  25   def find_resource(%Ecto.Query{} = query) do
  26     case __MODULE__.one(query) do
  27       nil -> {:error, :not_found}
  28       resource -> {:ok, resource}
  29     end
  30   end
  31
  32   def find_resource(_query), do: {:error, :not_found}
  33
  34   @doc """
  35   Gets association from cache or loads if need
  36
  37   ## Examples
  38
  39     iex> Repo.get_assoc(token, :user)
  40     %User{}
  41
  42   """
  43   @spec get_assoc(struct(), atom()) :: {:ok, struct()} | {:error, :not_found}
  44   def get_assoc(resource, association) do
  45     case __MODULE__.preload(resource, association) do
  46       %{^association => assoc} when not is_nil(assoc) -> {:ok, assoc}
  47       _ -> {:error, :not_found}
  48     end
  49   end
  50 end