凤凰/控制器中的测试日期

问题描述

具有以下基本测试(使用ex_machina):

Having the following basic test (using ex_machina) :

# factory
def item_factory do
  %Api.Content.Item{
    title: "Some title",
    content: "Some content",
    published_at: NaiveDateTime.utc_now
  }
end

# test
test "lists all items", %{conn: conn} do
  item = insert(:item)
  conn = get conn, item_path(conn, :index)
  assert json_response(conn, 200)["data"] == [
    %{
      "content" => item.content,
      "published_at" => item.published_at,
      "title" => item.title,
      "id" => item.id
    }
  ]
end

我在日期上遇到了错误:

Am getting an error on the date :

left: ... "published_at" => "2010-04-17T14:00:00.000000"
right: ... "published_at" => ~N[2010-04-17 14:00:00.000000]

使用"published_at" => "#{item.published_at}"

但仍然失败:

left: ..."published_at" => "2010-04-17T14:00:00.000000"
right: ..."published_at" => "2010-04-17 14:00:00.000000"

断言这种情况的正确方法是什么-如何正确投射"日期?

What would be the correct way to assert such case — how to correctly "cast" a date ?

推荐答案

item.published_at是NaiveDateTime结构.当将其转换为JSON时，编码器(此处可能为Poison)会将其转换为ISO8601字符串表示形式.

item.published_at is a NaiveDateTime struct. When it's converted to JSON, the encoder (likely Poison here) converts it to its ISO8601 string representation.

您的第一次尝试失败，因为您正在将NaiveDateTime结构与String进行比较.第二个失败，因为NaiveDateTime的String.Chars实现使用与ISO8601不同的表示形式.

Your first attempt fails because you're comparing a NaiveDateTime struct to a String. The second one fails because the String.Chars implementation of NaiveDateTime uses a different representation than ISO8601.

解决此问题的最简单方法是将published_at手动转换为其ISO 8601表示形式:

The easiest way to fix this is to manually convert published_at to its ISO 8601 representation:

assert json_response(conn, 200)["data"] == [
  %{
    ...
    "published_at" => NaiveDateTime.to_iso8601(item.published_at),
    ...
  }
]

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