只显示了自定义模板的内容，左侧导航没有显示出来。
原因：context 漏掉了，要补上。
# 错误写法（左侧导航不显示）
def changelist_view(self, request, extra_context=None):
form = CsvImportForm()
payload = {"form": form}
return TemplateResponse(request, "admin/csv_form.html", payload)
# 正确写法：========================
def changelist_view(self, request, extra_context=None):
form = CsvImportForm()# 我要用的内容
# 引入原有的内容
context = dict(
# Include common variables for rendering the admin template.
self.admin_site.each_context(request), # side nav was not loading because this was not added.
# Anything else you want in the context...
# key=value,
form= form # 加上我要用的内容
)
return TemplateResponse(request, "admin/csv_form.html", context)
How to add left sidebar in custom django admin template - Stack Overflow