启动服务器

Question

当我创建一个新的应用程序并启动凤凰网络服务器时，如下所示：

$ mix phoenix.new blog
$ cd blog
$ mix phoenix.server

...我收到以下错误：

=INFO REPORT==== 21-Jan-2016::21:57:19 ===
    application: logger
    exited: stopped
    type: temporary
** (Mix) Could not start application blog: Blog.start(:normal, []) returned an error: shutdown: failed to start child: Blog.Repo
    ** (EXIT) shutdown: failed to start child: Ecto.Adapters.Postgres
        ** (EXIT) an exception was raised:
            ** (RuntimeError) could not find Ecto.Adapters.Postgres.Connection.

Please verify you have added :postgrex as a dependency:

    {:postgrex, ">= 0.0.0"}

And remember to recompile Ecto afterwards by cleaning the current build:

    mix deps.clean ecto

                (ecto) lib/ecto/adapters/sql.ex:420: Ecto.Adapters.SQL.start_link/4
                (stdlib) supervisor.erl:343: :supervisor.do_start_child/2
                (stdlib) supervisor.erl:326: :supervisor.start_children/3
                (stdlib) supervisor.erl:292: :supervisor.init_children/2
                (stdlib) gen_server.erl:328: :gen_server.init_it/6
                (stdlib) proc_lib.erl:240: :proc_lib.init_p_do_apply/3

我已经尝试过我能想到的一切。这似乎与Postgres有关。我尝试过使用postgres 9.5.0和9.4.5。我尝试过使用自制程序和postgresapp安装方法。

我可以使用psql直接连接到Postgres。而且，我可以使用mix ecto.create有效地创建数据库。但是，mix ecto.migrate会抛出相同的错误。

有关我当前设置的一些信息：

• 操作系统：Mac 10.10.5 Yosemite
• Postgres：9.5.0（postgresapp）
• Erlang：18.2.1（自制安装）
• Elixir：1.2.1（自制安装）
• 凤凰城：1.1.3

编辑：

这是我的mix.exs文件：

defmodule Blog.Mixfile do
  use Mix.Project

  def project do
    [app: :blog,
     version: "0.0.1",
     elixir: "~> 1.0",
     elixirc_paths: elixirc_paths(Mix.env),
     compilers: [:phoenix, :gettext] ++ Mix.compilers,
     build_embedded: Mix.env == :prod,
     start_permanent: Mix.env == :prod,
     aliases: aliases,
     deps: deps]
  end

  # Configuration for the OTP application.
  #
  # Type `mix help compile.app` for more information.
  def application do
    [mod: {Blog, []},
     applications: [:phoenix, :phoenix_html, :cowboy, :logger, :gettext,
                    :phoenix_ecto, :postgrex]]
  end

  # Specifies which paths to compile per environment.
  defp elixirc_paths(:test), do: ["lib", "web", "test/support"]
  defp elixirc_paths(_),     do: ["lib", "web"]

  # Specifies your project dependencies.
  #
  # Type `mix help deps` for examples and options.
  defp deps do
    [{:phoenix, "~> 1.1.3"},
     {:phoenix_ecto, "~> 2.0"},
     {:postgrex, ">= 0.0.0"},
     {:phoenix_html, "~> 2.3"},
     {:phoenix_live_reload, "~> 1.0", only: :dev},
     {:gettext, "~> 0.9"},
     {:cowboy, "~> 1.0"}]
  end

  # Aliases are shortcut or tasks specific to the current project.
  # For example, to create, migrate and run the seeds file at once:
  #
  #     $ mix ecto.setup
  #
  # See the documentation for `Mix` for more info on aliases.
  defp aliases do
    ["ecto.setup": ["ecto.create", "ecto.migrate", "run priv/repo/seeds.exs"],
     "ecto.reset": ["ecto.drop", "ecto.setup"]]
  end
end