为什么我会收到“无效的实体类型”与datastore.Put使用Go AppEngine aetest中的datastore.PropertyList？ [英] Why do I get "invalid entity type" with datastore.Put using a datastore.PropertyList in a Go AppEngine aetest?

问题描述

此测试以 partnermerge_test.go：22：datastore：无效实体类型
$ b

This test fails with partnermerge_test.go:22: datastore: invalid entity type

package bigdipper

import (
    "testing"

    "appengine/aetest"
    "appengine/datastore"
)

func TestCreateMigrationProposal(t *testing.T) {
    c, err := aetest.NewContext(nil)
    if err != nil {
            t.Fatal(err)
    }
    defer c.Close()
    if _, err := datastore.Put(
            c,
            datastore.NewKey(c, "ORDER", "order-id-1", 0, nil),
            datastore.PropertyList{}); err != nil {
            t.Fatal(err)
    }
}

推荐答案

文档datastore.Put函数表示：

The docs for the datastore.Put function say:

Put将实体src以键k保存到数据存储中。 src必须是
结构指针或实现PropertyLoadSaver;如果一个结构指针
，那么该结构的任何未导出的字段都将被跳过。如果k是
不完整键，则返回的键将是由
数据存储区生成的唯一键。

Put saves the entity src into the datastore with key k. src must be a struct pointer or implement PropertyLoadSaver; if a struct pointer then any unexported fields of that struct will be skipped. If k is an incomplete key, the returned key will be a unique key generated by the datastore.

当试图将PropertyList作为 src 使用时，这有点令人困惑。 PropertyList不实现PropertyLoadSaver，但是* PropertyList的确。添加&在PropertyList之前得到一个指向它的指针修复了这个测试。

This was somewhat confusing when trying to use this with a PropertyList as the src. A PropertyList does not implement PropertyLoadSaver, but a *PropertyList does. Adding an & before PropertyList to get a pointer to it fixes this test.

package bigdipper

import (
    "testing"

    "appengine/aetest"
    "appengine/datastore"
)

func TestCreateMigrationProposal(t *testing.T) {
    c, err := aetest.NewContext(nil)
    if err != nil {
            t.Fatal(err)
    }
    defer c.Close()
    if _, err := datastore.Put(
            c,
            datastore.NewKey(c, "ORDER", "order-id-1", 0, nil),
            &datastore.PropertyList{}); err != nil {
            t.Fatal(err)
    }
}

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