在凤凰城无法使用Ecto模型制作JSONB

Question

我一直在尝试在postgresql中的jsonb列中保存JSON,我已经尝试过这个教程并且也开始阅读Ecto API以及Postgrex但是无法使它工作,一个工作的例子会让我高兴:)到目前为止我添加了这到我的配置

config :bonsai, Bonsai.Repo,
  adapter: Ecto.Adapters.Postgres,
  username: "demo",
  password: "demo123",
  database: "bonsai_test",
  hostname: "localhost",
  pool: Ecto.Adapters.SQL.Sandbox,
  extensions: [{Postgrex.Extensions.JSON, [library: Poison]}]

这是我的模特

defmodule Bonsai.Organization do
  use Bonsai.Web, :model

  schema "organizations" do
    field :name, :string
    field :currency, :string
    field :tenant, :string
    field :info, Bonsai.Json.Type, default: %{}
    field :settings, :map, default: %{} #, :map#, Bonsai.Json.Type

    timestamps
  end

  @required_fields ~w(name currency tenant)
  @optional_fields ~w()

  def changeset(model, params \\ :empty) do
    model
    |> cast(params, @required_fields, @optional_fields)
  end
end

类型的定义是在 web/utils/json.ex

defmodule Bonsai.Json.Type do
  @behaviour Ecto.Type
  alias Bonsai.Json

  def type, do: :json

  def load({:ok, json}), do: {:ok, json}
  def load(value), do: load(Poison.decode(value))

  def dump(value), do: Poison.encode(value)
end

当我尝试测试时,我无法保存信息或设置图

defmodule Bonsai.OrganizationTest do
  use Bonsai.ModelCase

  alias Bonsai.Organization

  @valid_attrs %{currency: "USD", name: "Home", tenant: "bonsai",
    settings: %{"last_save" => true},
    info: %{"address" => "Samaipata", "mobile" => "73732677", "age" => 40}
  }
  test "Store json data" do
    changeset = Organization.changeset(%Organization{}, @valid_attrs)
    {:ok, org} = Bonsai.Repo.insert(changeset)
    assert @valid_attrs.info() == org.info
  end
end

Answer 1

我不确定为什么它不适合你,但是:

确保你有最新的postgresql版本,json支持有点新.

这对我有用,也许有帮助.

• 迁移文件

  def change do
  create table(:objects) do
   add :drawing, :jsonb
   timestamps
  end
  

• 我也使用json字段,但在我的模型中它是一个地图:

   use .Web, :model
    schema "objects" do
     field :drawing, :map
     timestamps
    end