Phoenix服务器无法启动-- Postgrex失败(退出)无进程

Question

尝试通过mix phoenix.server启动时，将报告以下错误，直到服务器被终止：

    ** (stop) exited in: GenServer.call(Postgrex.TypeServer, {:fetch, {'localhost', 5432, "database_name", :copy, [{Ecto.Adapters.Postgres.DateTime, []}, {Postgrex.Extensions.JSON, [library: nil]}]}}, 60000)

数据库和权限都已通过验证，运行正常。

完整的堆栈跟踪：

    Last message: nil
    State: Postgrex.Protocol
    [error] GenServer #PID<0.820.0> terminating
    ** (stop) exited in: GenServer.call(Postgrex.TypeServer, {:fetch, {'localhost', 5432, "database_name", :copy, [{Ecto.Adapters.Postgres.DateTime, []}, {Postgrex.Extensions.JSON, [library: nil]}]}}, 60000)
        ** (EXIT) no process
        (elixir) lib/gen_server.ex:596: GenServer.call/3
        lib/postgrex/protocol.ex:486: Postgrex.Protocol.bootstrap/3
        lib/postgrex/protocol.ex:353: Postgrex.Protocol.handshake/2
        lib/db_connection/connection.ex:134: DBConnection.Connection.connect/2
        lib/connection.ex:622: Connection.enter_connect/5
(stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3

Answer 1

确保您的应用程序的mix.exs文件将:postgrex列为依赖项。

例如：

    def application do
      [mod: {Chat, []},
      applications: [:phoenix, :phoenix_html, :cowboy, :logger, :postgrex]]
    end