Python 列表中的多对多显示 django
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many-to-many in list display django
提问by Mdjon26
class PurchaseOrder(models.Model):
product = models.ManyToManyField('Product')
vendor = models.ForeignKey('VendorProfile')
dollar_amount = models.FloatField(verbose_name='Price')
class Product(models.Model):
products = models.CharField(max_length=256)
def __unicode__(self):
return self.products
I have that code. Unfortunately, the error comes in admin.py with the ManyToManyField
我有那个代码。不幸的是，错误出现在 admin.py 中ManyToManyField
class PurchaseOrderAdmin(admin.ModelAdmin):
fields = ['product', 'dollar_amount']
list_display = ('product', 'vendor')
The error says:
错误说：
'PurchaseOrderAdmin.list_display[0]', 'product' is a ManyToManyField which is not supported.
'PurchaseOrderAdmin.list_display[0]', 'product' 是不受支持的多对多字段。
However, it compiles when I take 'product'out of list_display. So how can I display 'product'in list_displaywithout giving it errors?
但是，当我'product'取出list_display. 那么我怎样才能'product'在list_display不出错的情况下显示呢？
edit: Maybe a better question would be how do you display a ManyToManyFieldin list_display?
编辑：也许更好的问题是你如何显示ManyToManyFieldin list_display？
采纳答案by karthikr
You may not be able to do it directly. From the documentation of list_display
您可能无法直接执行此操作。从文档list_display
ManyToManyField fields aren't supported, because that would entail executing a separate SQL statement for each row in the table. If you want to do this nonetheless, give your model a custom method, and add that method's name to list_display. (See below for more on custom methods in list_display.)
不支持 ManyToManyField 字段，因为这需要为表中的每一行执行单独的 SQL 语句。尽管如此，如果您想这样做，请为您的模型提供一个自定义方法，并将该方法的名称添加到 list_display。（有关 list_display 中自定义方法的更多信息，请参见下文。）
You can do something like this:
你可以这样做：
class PurchaseOrderAdmin(admin.ModelAdmin):
fields = ['product', 'dollar_amount']
list_display = ('get_products', 'vendor')
def get_products(self, obj):
return "\n".join([p.products for p in obj.product.all()])
OR define a model method, and use that
或者定义一个模型方法，并使用它
class PurchaseOrder(models.Model):
product = models.ManyToManyField('Product')
vendor = models.ForeignKey('VendorProfile')
dollar_amount = models.FloatField(verbose_name='Price')
def get_products(self):
return "\n".join([p.products for p in self.product.all()])
and in the admin list_display
并在管理员中 list_display
list_display = ('get_products', 'vendor')
回答by JKV
This way you can do it, kindly checkout the following snippet:
这样你就可以做到这一点，请查看以下代码段：
class Categories(models.Model):
""" Base category model class """
title = models.CharField(max_length=100)
description = models.TextField()
parent = models.ManyToManyField('self', default=None, blank=True)
when = models.DateTimeField('date created', auto_now_add=True)
def get_parents(self):
return ",".join([str(p) for p in self.parent.all()])
def __unicode__(self):
return "{0}".format(self.title)
And in your admin.py module call method as follows:
在您的 admin.py 模块调用方法中，如下所示：
class categories(admin.ModelAdmin):
list_display = ('title', 'get_parents', 'when')
