如何使用地理库创建有效的Ecto模型变更集? [英] How to use Geo library to create valid Ecto Model changeset?

问题描述

我正在尝试使用 Geo 库通过Phoenix模型更改集存储Geo.Point.我的参数是:{coordinates: [49.44, 17.87]}或更喜欢的是{coordinates: {latitude: 49.44, longitude: 17.87}}

I'm trying to use Geo library to store Geo.Point via Phoenix model changeset. My params are: {coordinates: [49.44, 17.87]} or more prefer would be {coordinates: {latitude: 49.44, longitude: 17.87}}

在iex控制台中，我尝试过:

In iex console I tried:

iex(5)> changeset = Place.changeset(%Place{}, %{coordinates: [49.44, 17.87]})
%Ecto.Changeset{action: nil, changes: %{}, constraints: [],
 errors: [coordinates: "is invalid"], filters: %{}
 model: %Myapp.Place{__meta__: #Ecto.Schema.Metadata<:built>,
  coordinates: nil, id: nil, inserted_at: nil, updated_at: nil}, optional: [],
 opts: [], params: %{"coordinates" => [49.445614899999995, 17.875574099999998]},
 repo: nil, required: [:coordinates],

所有其他尝试均以Poison.Parser错误结束.

All other attempts ended by Poison.Parser errors.

应该如何从客户端看参数来创建有效的变更集?

How should looks params from client side to create valid changeset?

型号:

defmodule MyApp.Place do
  use MyApp.Web, :model

  schema "place" do
    field :coordinates, Geo.Point

    timestamps
  end

  @required_fields ~w(coordinates)
  @optional_fields ~w()

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

推荐答案

根据该库的测试:

https://github.com/bryanjos/geo/blob/351ee6c4f8ed24541c9c2908f615e7b0a238f010/test/geo/ecto_test.exs#L100

您需要将Geo.Point传递给变更集函数:

You need to pass a Geo.Point to your changeset function:

changeset = Place.changeset(%Place{}, %{coordinates: %Geo.Point{coordinates: {49.44, 17.87}})

您可以在[docs]中了解有关自定义ecto类型的更多信息.( https://hexdocs.pm/ecto/Ecto.Type.html#content )

You can read more about custom ecto types in [the docs].(https://hexdocs.pm/ecto/Ecto.Type.html#content)

这篇关于如何使用地理库创建有效的Ecto模型变更集?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！