为什么在Django视图中不能继承多重继承？ [英] Why doesn't multiple inheritance work in Django views?

问题描述

我试图避免在表单和（基于类）视图中重复字段和模型说明符列表。

I am trying to avoid repeating the list of fields and model specifier in both a form and a (class based) view.

这个答案建议定义一个元类，其中包含字段列表，并在表单和视图中继承该类。

This answer suggested defining a "meta class" that has the field list in it, and inheriting that class in both the form and the view.

表单正常工作，但以下代码将列表和目标模型继承到视图中会导致此错误：

It works fine for the form, but the following code inheriting the list and target model into the view results in this error:

TemplateResponseMixin需要定义template_name或get_template_names（）的实现

TemplateResponseMixin requires either a definition of 'template_name' or an implementation of 'get_template_names()'

I不幸的是看到这个变化是如何导致这个错误的。

I'm at a loss to see how this change causes that error.

forms.py：

class ScenarioFormInfo:
    model = Scenario
    fields = ['scenario_name', 'description', 'game_type', 
              'scenario_size', 'weather', 'battle_type', 'attacker',
              'suitable_for_axis_vs_AI', 'suitable_for_allies_vs_AI', 
              'playtested_H2H', 'suitable_for_H2H',
              'scenario_file', 'preview']     


class ScenarioForm(forms.ModelForm):
    Meta = ScenarioFormInfo

views.py： / p>

views.py:

    class ScenarioUpload(generic.CreateView, forms.ScenarioFormInfo):
        form_class = ScenarioForm
#        model = Scenario
#        fields = ['scenario_name', 'description', 'game_type', 
#                  'scenario_size', 'weather', 'battle_type', 'attacker',
#                  'suitable_for_axis_vs_AI', 'suitable_for_allies_vs_AI', 
#                  'suitable_for_H2H', 'playtested_H2H',
#                  'scenario_file', 'preview']     

推荐答案

不要混用新样式对象和旧样式对象，将类定义更改为

do not mix new style object and old style object, change your class definitions as

class ScenarioFormInfo(object)

将您的Mixin作为第一个

put your Mixin as first

class ScenarioUpload(forms.ScenarioFormInfo, generic.CreateView):

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