5 Django系列之通过list_display展示多对多与外键内容在admin-web界面下

list_display展示多对多关系的内容

表结构关系
表一

class Server(models.Model):asset = models.OneToOneField('Asset')created_by_choices = (('auto','Auto'),('manual','Manual'),)created_by = models.CharField(choices=created_by_choices,max_length=32,default='auto') #auto: auto created,   manual:created manuallyhosted_on = models.ForeignKey('self',related_name='hosted_on_server',blank=True,null=True) #for vitural servermodel = models.CharField(u'型号',max_length=128,null=True, blank=True )# 若有多个CPU，型号应该都是一致的，故没做ForeignKeyraid_type = models.CharField(u'raid类型',max_length=512, blank=True,null=True)os_type  = models.CharField(u'操作系统类型',max_length=64, blank=True,null=True)os_distribution =models.CharField(u'发型版本',max_length=64, blank=True,null=True)os_release  = models.CharField(u'操作系统版本',max_length=64, blank=True,null=True)salt_minion_id = models.CharField(u'salt minion id',max_length=254,blank=True,null=True)create_date = models.DateTimeField(blank=True, auto_now_add=True)update_date = models.DateTimeField(blank=True,null=True)class Meta:verbose_name = '服务器'verbose_name_plural = "服务器"def __str__(self):return '%s sn:%s' %(self.asset.name,self.asset.sn)

表二

class SaltGroup(models.Model):'''saltstack 的minion组管理'''group_name = models.CharField(u'组名',max_length=50)host_target = models.ManyToManyField(Server,verbose_name='组成员',null=True,blank=True)whether_create = models.IntegerField(u'是否创建了组在saltstack配置文件里',default=0) #0：没有创建，1：表示创建了class Meta:db_table = "saltstack组"

然后我们在admin配置文件这么写：

class Saltstack_GroupAdmin(admin.ModelAdmin):list_display = ['group_name','salt_minion_id']  # 这里需要注意的是，salt_minion_id是我们要在前端展示的内容，自己定义的def  salt_minion_id(self,obj):'''这个方法就是用来对salt_minion_id这个字段做处理，把我们需要展示的前端内容截取出来。需要注意的是，方法名必须要和在list_display里面的一致，这样才可以调用。'''print(obj.host_target.salt_minion_id)return obj.host_target.salt_minion_id   # host_target是我们SaltGroup表中多对多的字段，salt_minion_id是刚才我们自定义的字段，salt_minion_id.short_description = "Minion's ID "     # 对salt_minion_id这个做个简短的title。admin.site.register(models.SaltGroup,Saltstack_GroupAdmin),

好了至此，重启下django即可在django admin界面下使用了

list_display展示外键内容

首先看看表结构关系
表一

class DockerContainers(models.Model):'''用来记录docker容器信息的'''Real_host_ip = models.ForeignKey(DockerOfHost,verbose_name='Docker宿主机IP')  # 这段是外键Container_id = models.CharField(u'容器ID',max_length=400,primary_key=True,unique=True)Container_name = models.CharField(u'容器名字',max_length=300,null=True,blank=True)Container_image = models.CharField(u'容器镜像',max_length=300)Container_Image_id = models.CharField(u'镜像ID',max_length=500,null=True,blank=True)Command = models.CharField(u'运行的命令',max_length=300,null=True,blank=True)Created = models.CharField(u'创建时间',max_length=200)Status = models.CharField(u'运行状态',max_length=100,null=True,blank=True)Port = models.CharField(u'容器端口',max_length=1000,null=True,blank=True)SizeRw = models.IntegerField(null=True,blank=True)SizeRootFs = models.IntegerField(null=True,blank=True)Host_config = models.CharField(u'主机配置',max_length=1024,null=True,blank=True)Network_settings = models.CharField(u'网络配置',max_length=3000,null=True,blank=True)Mounts = models.CharField(u'挂载目录',max_length=1024,null=True,blank=True)Record_time = models.DateTimeField(u'数据更新时间',auto_now=True)def __str__(self):return "%s:%s"%(self.Real_host_ip,self.Container_id)class Meta:verbose_name = "Docker容器信息"verbose_name_plural = "Docker容器信息"

表二：

class DockerOfHost(models.Model):'''用来记录docker宿主机信息到'''host_ip = models.CharField(u'Docker宿主机IP',max_length=250,unique=True)def __str__(self):return self.host_ip   # 一定要retrun self.ip，这样list_display才能显示class Meta:verbose_name = "Docker宿主机IP"verbose_name_plural = "Docker宿主机IP"

admin.py里的代码如下：

class dockercontainers(admin.ModelAdmin):list_display = ['Real_host_ip','Container_id','Container_name','Container_image','Container_Image_id','Command','Created','Status',\'Port','SizeRw','SizeRootFs','Host_config','Network_settings','Mounts','Record_time']search_fields = ['Container_id','Container_name','Container_image','Status']

其实最关键的一步在于表二里的__str__方法return回来的内容，套用官网的一句话就是：If the field is a ForeignKey, Django will display the str() (unicode() on Python 2) of the related object. If you don’t set list_display, the admin site will display a single column that displays the str() (unicode() on Python 2) representation of each object.

更多资料可以参考官网：https://docs.djangoproject.com/en/1.10/ref/contrib/admin/