代码：
class CaseStepAdmin(admin.ModelAdmin):
list_display = ('id', 'casetep', 'casedata', 'webcase', 'stepresult', 'update_time', 'create_time')
model = CaseStep
extra = 1
class WebCaseAdmin(admin.ModelAdmin):
list_display = ('id', 'casename', 'caseresult', 'casetester', 'module',
'update_time', 'create_time')
list_display_links = ('casename',)
ordering = ('-create_time',)
search_fields = ('casename', 'caseresult')
inlines = [CaseStepAdmin]
使用python manage.py migrations同步数据时提示 (admin.E104) 'web.admin.CaseStepAdmin' must inherit from 'InlineModelAdmin'.将一个模型作为内连放入另一个模型，需要继承TabularInline
更改后：
class CaseStepAdmin(admin.TabularInline):
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