django admin list_display SQL joindata

Question

由现有 php 组成的页面正在更改为 python 和 Django。

现有查询

Select
    l.lawyer_idx,
    l.lawyer_email,
    lp.lawyer_profile_path,
    lp.lawyer_profile_name,
    lc.lawyer_company_name,
    lc.lawyer_company_address,
    lc.lawyer_detail_address,
    l.lawyer_agent
from lawyer l
left join lawyer_profile lp on l.lawyer_idx = lp.lawyer_idx
left join lawyer_company lc on l.lawyer_idx = lc.lawyer_idx
order by l.register_date desc;

我在 models.py 中制作了每个表格

    models.py

    class Lawyer(models.Model):
     lawyer_idx = models.AutoField('ID', primary_key=True)
      lawyer_email = models.CharField('E-mail', unique=True, max_length=200)
     lawyer_agent = models.CharField(max_length=1, blank=True, null=True)

    class Meta:
       managed = False
       db_table = 'lawyer'


    class LawyerProfile(models.Model):
     lawyer_idx = models.AutoField('ID', primary_key=True)
     lawyer_profile_path = models.CharField(max_length=200, blank=True, null=True)
   lawyer_profile_name = models.CharField(max_length=100, blank=True, null=True)
.................

    class LawyerCompany(models.Model):
     lawyer_idx = models.AutoField('ID', primary_key=True)
     lawyer_company_name = models.CharField(max_length=100)
    ...............

我们想将以下查询放入 Django Admin.py 的 list_display 部分有没有办法显示在 sql 中加入的数据？

    Admin.py
    from django.contrib import admin
    from .models import Lawyer, LawyerCompany, LawyerProfile

    @admin.register(Lawyer)
    class LawyerAdmin(admin.ModelAdmin):

       list_per_page = 100
       **list_display = ['lawyer_idx', 'lawyer_email', 
'lawyer_agent', 'lawyer_profile_path', 'lawyer_profile_name', 'lawyer_company_name']**

Answer 1

您可以将查询添加为原始 sql 查询，但这不会充分利用 Django 的 ORM。

您没有在模型上明确定义任何关系，因此 Django 不知道您的模型是如何关联的。

如果lawyer_idx 引用了律师，您可以将字段更改为OneToOneField/ForeignKey（无论如何，AutoField 在这里可能是错误的选择，因为这些值应该对应于Lawyer 模型中的值并且不会自动生成）。另请查看one-to-one 和many-to-one 关系的文档。

class LawyerProfile(models.Model):
     lawyer = models.OneToOneField(Lawyer, primary_key=True, 
         db_column="lawyer_idx", related_name="profile")

Django 在访问相关数据时应该自动执行连接；在Lawyer 实例上，您可以通过其related_name .profile 访问配置文件。在list_display 选项中，您可以使用双下划线语法访问相关数据：

list_display = ['lawyer_idx','lawyer_agent', 'profile__lawyer_profile_path']
list_select_related = ['profile']

如果添加list_select_related option Django 已经预先加入了指定的表，所以在访问相关数据时不会执行额外的查询。