如何在django Admin中仅显示相关父项的子项记录？

Question

模型“ Playbook”具有相关的子对象“ Activities”，需要在django admin中为每个“ playbook”对象使用list_display“ Activities”。 当前，list_display显示所有剧本对象（父对象）的所有活动对象。

django v 1.10.x，python 3.5.x

Model.py

class PlayBook(TimeStampModel):
    name = models.CharField(max_length=200, unique=True)
    description = models.TextField(blank=True, help_text="Business purpose of the application")
    owner = models.ForeignKey(User, on_delete=models.CASCADE)

    class Meta:
        ordering = ('name',)

    @property
    def short_description(self):
        return truncatechars(self.description, 35)

    def __str__(self):
        return "{}".format(self.name)

class Activity(TimeStampModel):

    minor = 'MINOR'
    normal = 'NORMAL'
    important = 'IMPORTANT'
    critical = 'CRITICAL'

    SEVERITY = (
        (minor, 'Minor'),
        (normal, 'Normal'),
        (important, 'Important'),
        (critical, 'Critical'),
    )

    low = 'LOW'
    high = 'HIGH'
    PRIORITY = (
            (low, 'Low'),
            (normal, 'Normal'),
            (high, 'High'),
            )

    new = 'New'
    in_progress = 'In_Progress'
    needs_info = 'Needs_Info'
    postponed = 'Postponed'
    closed = 'Closed'
    STATUS= (
            (new, 'New'),
            (in_progress, 'In_Progress'),
            (needs_info, 'Needs_Info'),
            (postponed, 'Postponed'),
            (closed, 'Closed'),

            )

    playbook = models.ForeignKey(PlayBook)
    subject = models.CharField(max_length=200, unique=True)
    description = models.TextField(blank=True, help_text="Business purpose of the application")
    manager = models.ForeignKey(User, on_delete=models.CASCADE)
    severity = models.CharField(max_length = 100, choices=SEVERITY, default=normal)
    priority = models.CharField(max_length = 100, choices=PRIORITY, default=normal)
    status = models.CharField(max_length = 100, choices=STATUS, default=new)

    def __str__(self):
        return "{}".format(self.subject)

    class Meta:
        ordering = ('severity',)
    @property
    def short_description(self):
        return truncatechars(self.description, 35)

class ReviewActivity(Activity):
    class Meta:
        proxy=True

    def __str__(self):
        return self.subject.upper()

Admin.py

class ActivityAdmin(admin.TabularInline):
    list_display =['severity','priority', 'subject', 'status_colored','created','updated', 'short_description']

    def status_colored(self, obj):
        colors = {
            'Closed': '#DCE775',
            'Needs_Info': '#F8BBD0'  ,
            'In_Progress': '#FFCCBC',
            'New':'#81D4FA',
            'Postponed': '#CFD8DC'
        }
        return format_html(
            '<b style="background:{};">{}</b>',
            colors[obj.status],
            obj.status,
        )

class ActivityInline(admin.TabularInline):
    model = Activity
    extra = 1

class PlayBookAdmin(admin.ModelAdmin):

    inlines = [
            ActivityInline,
            ]

    list_display =['name','short_description','created', 'updated','owner',]


class ReviewActivityAdmin(admin.ModelAdmin):

    list_display =['severity','priority', 'subject', 'status_colored','created','updated', 'short_description']

    def status_colored(self, obj):
        colors = {
            'Closed': '#DCE775',
            'Needs_Info': '#F8BBD0'  ,
            'In_Progress': '#FFCCBC',
            'New':'#81D4FA',
            'Postponed': '#CFD8DC'
        }
        return format_html(
            '<b style="background:{};">{}</b>',
            colors[obj.status],
            obj.status,
        )

#admin.site.register(Activity, ActivityAdmin)
admin.site.register(PlayBook, PlayBookAdmin)
admin.site.register(ReviewActivity, ReviewActivityAdmin)

结果：

我尝试使用代理模型。 但是它仍然显示所有父母的所有孩子记录。

Playbook链接显示以下内容： playbook1显示表格显示

问题：

查看活动链接显示所有剧本的所有活动对象。 需要显示相关剧本的活动对象。 并非所有剧本* 。 参见（图4）：

链接到github：

链接到源TaskMaster

Answer 1

今天早上我刚遇到类似的情况，这就是我解决的方法。 我将使用您的示例进行解释。

我在PlayBook模型中定义了一个称为activity（）的新方法，如下所示：

class PlayBook(TimeStampModel):
    name = models.CharField(max_length=200, unique=True)
    owner = models.ForeignKey(User, on_delete=models.CASCADE)

    def activities(self):
    qs = self.activity_set.all() # this gets all the child related objects
    for x in qs:
        result = x.subject # here i am just getting one of the fields from the Activities model
    return result

所以现在在您的admin.py中，您可以按以下方式设置list_diplay

class PlayBookAdmin(admin.ModelAdmin):

    list_display =['activities',] # This will call the activities() method that your created in the models.py and display the result.