Postgres - Phoenix/Elixir installare errori

Question

Sto seguendo questo tutorial Elixir blog in 15 minutes using Phoenix framework - Step by Step

Ma ho un problema, che non ho idea di come risolvere il problema. Penso che abbia qualcosa a che fare con i postgres.

ho fatto:

$ mix ecto.create 
$ mix ecto.migrate 

    C:\Users\999\Documents\elixir_files\blog>mix ecto.create 
** (RuntimeError) could not find executable `psql` in path, please guarantee it is available before running ecto commands 
    lib/ecto/adapters/postgres.ex:105: Ecto.Adapters.Postgres.run_with_psql/2 
    lib/ecto/adapters/postgres.ex:82: Ecto.Adapters.Postgres.storage_up/1 
    lib/mix/tasks/ecto.create.ex:32: Mix.Tasks.Ecto.Create.run/1 
    (mix) lib/mix/cli.ex:55: Mix.CLI.run_task/2 
    (stdlib) erl_eval.erl:669: :erl_eval.do_apply/6 
    (elixir) lib/code.ex:131: Code.eval_string/3 


C:\Users\999\Documents\elixir_files\blog>mix ecto.migrate 
[warning] the :size option when configuring Blog.Repo is deprecated, please use :pool_size instead 
** (exit) exited in: GenServer.call(#PID<0.139.0>, {:query, "CREATE TABLE IF NOT EXISTS \"schema_migrations\" (\"version\" bigint PRIMARY KEY, \"inserted_at\" timestamp)", []}, :infinity) 
    ** (EXIT) %Postgrex.Error{message: "tcp connect: econnrefused", postgres: nil} 
    (elixir) lib/gen_server.ex:356: GenServer.call/3 
    (postgrex) lib/postgrex/connection.ex:102: Postgrex.Connection.query/4 
    (ecto) lib/ecto/adapters/postgres/connection.ex:31: Ecto.Adapters.Postgres.Connection.query/4 
    (ecto) lib/ecto/adapters/sql.ex:242: Ecto.Adapters.SQL.query/7 
    (ecto) lib/ecto/pool.ex:159: Ecto.Pool.do_run/4 
    (ecto) lib/ecto/adapters/sql.ex:230: Ecto.Adapters.SQL.query/6 
    (ecto) lib/ecto/adapters/sql.ex:208: Ecto.Adapters.SQL.query/5 
    (ecto) lib/ecto/adapters/sql.ex:169: Ecto.Adapters.SQL.query!/5 





    [warning] the :size option when configuring Blog.Repo is deprecated, please use :pool_size instead 
[info] GET /posts 
[debug] Processing by Blog.PostController.index/2 
    Parameters: %{"format" => "html"} 
    Pipelines: [:browser] 
[error] GenServer #PID<0.280.0> terminating 
Last message: {:"$gen_cast", :connect} 
State: %{backend_key: nil, bootstrap: false, extensions: [{Ecto.Adapters.Postgres.DateTime, []}, {Postgrex.Extensions.JSON, [library: Poison]}, {Postgrex.Extensions.Binary, nil}, {Postgrex.Extensions.Text, nil}], listener_channels: #HashDict<[]>, listeners: #HashDict<[]>, opts: [hostname: "localhost", timeout: 5000, otp_app: :blog, repo: Blog.Repo, adapter: Ecto.Adapters.Postgres, username: "postgres", password: "postgres", database: "blog_dev", extensions: [{Ecto.Adapters.Postgres.DateTime, []}, {Postgrex.Extensions.JSON, [library: Poison]}], port: 5432], parameters: %{}, portal: nil, queue: {[%{command: {:connect, [hostname: "localhost", timeout: 5000, otp_app: :blog, repo: Blog.Repo, adapter: Ecto.Adapters.Postgres, username: "postgres", password: "postgres", database: "blog_dev", extensions: [{Ecto.Adapters.Postgres.DateTime, []}, {Postgrex.Extensions.JSON, [library: Poison]}], port: 5432]}, from: nil, reply: :no_reply}], []}, rows: [], sock: nil, state: :ready, statement: nil, tail: "", types: :types_removed, types_key: {'localhost', 5432, "blog_dev", [{Ecto.Adapters.Postgres.DateTime, []}, {Postgrex.Extensions.JSON, [library: Poison]}]}} 
** (exit) %Postgrex.Error{message: "tcp connect: econnrefused", postgres: nil} 
[info] Sent 500 in 1149ms 
[error] #PID<0.278.0> running Blog.Endpoint terminated 
Server: localhost:4000 (http) 
Request: GET /posts 
** (exit) exited in: GenServer.call(#PID<0.280.0>, {:query, "SELECT p0.\"id\", p0.\"title\", p0.\"body\", p0.\"inserted_at\", p0.\"updated_at\" FROM \"posts\" AS p0", []}, 5000) 
    ** (EXIT) %Postgrex.Error{message: "tcp connect: econnrefused", postgres: nil} 

Answer 1

Non hai specificato quale sistema operativo si sta utilizzando, ma sembra che il problema è che non si dispone di psql installato.

È possibile installarlo su Ubuntu con:

sudo apt-get install postgresql 

O su OS X con:

brew install postgresql 

Se siete su qualcos'altro poi seguire una delle guide di installazione: https://wiki.postgresql.org/wiki/Detailed_installation_guides

Il secondo errore è un avviso di ritiro: in ecto v0.15.0 il parametro :size è stato modificato in :pool_size - è necessario modificare questo config/dev.exs, config/test.exs e config/prod.exs:

# Configure your database 
config :myapp_admin, MyApp.Repo, 
    adapter: Ecto.Adapters.Postgres, 
    username: "postgres", 
    password: "postgres", 
    database: "my_app_test", 
    pool_size: 10 # This used to be called size 

Answer 2

mio semplice correzione era installando pgAgent in cima postgre. Quindi aggiungendo la posizione C:\Program Files (x86)\pgAgent\bin al valore variabile di PATH in Variabili d'ambiente. Altro aiuto here.