列表中的多对多显示django [英] many-to-many in list display django

问题描述

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有那个代码不幸的是，admin.py中的错误出现在ManyToManyField

I have that code. Unfortunately, the error comes in admin.py with the "ManyToManyField"

class PurchaseOrderAdmin(admin.ModelAdmin):
    fields = ['product', 'dollar_amount']
    list_display = ('product', 'vendor')

错误说'PurchaseOrderAdmin.list_display [0]'，'product'是一个ManyToManyField不受支持。

The error says "'PurchaseOrderAdmin.list_display[0]', 'product' is a ManyToManyField which is not supported."

然而，它编译时我从list_display中取出product。那么如何在list_display中显示product而不给出错误？

However, it compiles when I take 'product' out of list_display. So how can I display 'product' in list_display without giving it errors?

编辑：可能更好的问题是如何在list_display中显示ManyToManyField？

edit: Maybe a better question would be how do you display a ManyToManyField in list_display?

推荐答案

您可能无法直接执行。 从<$ c $的文档c> list_display

You may not be able to do it directly. From the documentation of list_display

ManyToManyField字段不受支持，因为这将需要
为表中的每一行执行单独的SQL语句。如果
想要这样做，请给您的模型一个自定义的方法，并将该方法的名称添加到
到list_display。 （见下文关于list_display中的自定义
方法的更多信息。）

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.)

您可以这样做：

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()])

或定义一个模型方法，并使用

OR define a model method, and use that

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()])

和在管理员 list_display

list_display = ('get_products', 'vendor')

这篇关于列表中的多对多显示django的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！