使用固定裝置進行 django 單元測試 - 對象匹配查詢不存在

Question

我正在嘗試使用夾具在 django 中設置單元測試。

我可以成功加載我的裝置，但是當我嘗試從中檢索數據時，出現錯誤：

DoesNotExist: BlogIndexPage matching query does not exist.

這是我的測試代碼（我使用的是 Wagtail CMS，它使用一些其他方法擴展了 unittest）：

class BlogTests(WagtailPageTests):
    fixtures = ['demosite.json']

    def test_can_create_blog_entry(self):
        blog_index_page = BlogIndexPage.objects.get(pk=5)
        self.assertCanCreate(blog_index_page, BlogPage, {
            'title': 'Post 2',
            'date': '2017-10-11',
            'intro': 'Post 2',
            'body': '<p>Test Post</p>'
        })

這是我的固定裝置：

[
{
    "pk": 1,
    "model": "wagtailcore.page",
    "fields": {
        "title": "Root",
        "draft_title": "Root",
        "numchild": 1,
        "show_in_menus": false,
        "live": true,
        "seo_title": "",
        "depth": 1,
        "search_description": "",
        "content_type": [
            "wagtailcore",
            "page"
        ],
        "has_unpublished_changes": false,
        "owner": null,
        "path": "0001",
        "url_path": "/",
        "slug": "root"
    }
},
{
    "pk": 2,
    "model": "wagtailcore.page",
    "fields": {
        "title": "Home page",
        "draft_title": "Home page",
        "numchild": 5,
        "show_in_menus": true,
        "live": true,
        "seo_title": "",
        "depth": 2,
        "search_description": "",
        "content_type": [
            "home",
            "homepage"
        ],
        "has_unpublished_changes": false,
        "owner": null,
        "path": "00010002",
        "url_path": "/home-page/",
        "slug": "home-page"
    }
},
{
    "pk": 5,
    "model": "wagtailcore.page",
    "fields": {
        "title": "Blog index",
        "draft_title": "Blog index",
        "numchild": 3,
        "show_in_menus": true,
        "live": true,
        "seo_title": "",
        "depth": 3,
        "search_description": "",
        "content_type": [
            "blog",
            "blogindexpage"
        ],
        "has_unpublished_changes": false,
        "owner": null,
        "path": "000100020002",
        "url_path": "/blog/",
        "slug": "blog"
    }
},
{
    "pk": 16,
    "model": "wagtailcore.page",
    "fields": {
        "title": "Blog post",
        "draft_title": "Blog post",
        "numchild": 0,
        "show_in_menus": false,
        "live": true,
        "seo_title": "",
        "depth": 4,
        "search_description": "The origin of the genus appears to be in the general area of Eastern Siberia/Mongolia. Wagtails spread rapidly across Eurasia and dispersed to Africa in the Zanclean (Early Pliocene) where the sub-Saharan lineage was later isolated. The African Pied Wagtail (and possibly the Mekong Wagtail) diverged prior to the massive radiation of the white-bellied black-throated and most yellow-bellied forms, all of which took place during the late Piacenzian (early Late Pliocene), c. 3 mya.",
        "content_type": [
            "blog",
            "blogpage"
        ],
        "has_unpublished_changes": false,
        "owner": null,
        "path": "0001000200020001",
        "url_path": "/home-page/blog-index/blog-post/",
        "slug": "blog-post"
    }
}
]

所以基本上我只想抓取那個博客索引頁面，並測試我是否可以在它下面創建一個博客頁面（博客文章）。 我究竟做錯了什么？

Answer 1

您的裝置需要包含"model": "blog.blogindexpage"以及"model": "wagtailcore.page" ，並具有匹配的pk值。 這是因為 Wagtail 使用多表繼承來表示頁面：一個頁面的數據被拆wagtailcore_page表（包含所有頁面類型共有的核心字段，例如標題）和另一個表（例如blog_blogindexpage用於每個頁面模型，包含為該特定模型定義的附加字段。 如果兩個表中都沒有記錄，則在BlogIndexPage查找將不會返回任何結果，從而導致上面的DoesNotExist錯誤。

您可以運行./manage.py dumpdata --indent 4以獲取夾具使用的 JSON 格式的開發數據庫的轉儲； 根據您的測試需要，您可以直接使用它（ ./manage.py dumpdata --indent 4 > blog/fixtures/demosite.json ）或將其用作手動編寫自己的夾具的指南。