Question

我有一个django模型管理页面，想要使用它的搜索功能，所以我定义了一个像这样的search_fields：

    search_fields = (
                 'name', 'email',
                 'vacancy__position__name',
                 'vacancy__location__name',
                 )

问题是'空缺'字段可以为空，但搜索找不到具有空'空缺'的项目，所以我深入研究它执行的sql并发现问题：

SELECT "testapp_subject"."name", "testapp_subject"."email",
  FROM "testapp_candidate"
 INNER JOIN "testapp_subject" ON ("testapp_candidate"."subject_ptr_id" = "testapp_subject"."id")
  LEFT OUTER JOIN "testapp_vacancy" ON ("testapp_candidate"."vacancy_id" = "testapp_vacancy"."id")
  LEFT OUTER JOIN "testapp_position" ON ("testapp_vacancy"."position_id" = "testapp_position"."id")
 INNER JOIN "testapp_location" ON ("testapp_vacancy"."location_id" = "testapp_location"."group_ptr_id")
 WHERE (UPPER("testapp_subject"."name"::text) LIKE UPPER(%j%)
        OR UPPER("testapp_subject"."email"::text) LIKE UPPER(%j%)
        OR UPPER("testapp_position"."name"::text) LIKE UPPER(%j%)
        OR UPPER("testapp_location"."name"::text) LIKE UPPER(%j%) )
 ORDER BY "testapp_candidate"."subject_ptr_id" DESC

如您所见，最后的INNER JOIN应该是LEFT OUTER JOIN。

我试图深入研究sql生成部分，看看发生了什么，但代码太复杂，无法阅读。任何人都知道发生了什么事，或者是否有人遇到过同样的情况？

以下是我案例的简化模型结构。

class Group(models.Model):
    pass

class Organization(models.Model):
    name = models.CharField(max_length = 50)

class Position(models.Model):
    name = models.CharField(max_length=80)

class Location(Group):
    name = models.CharField(max_length=80)
    org = models.ForeignKey(Organization)

class Vacancy(models.Model):
    position = models.ForeignKey(Position)
    location = models.ForeignKey(Location)
    date = models.DateField(default=datetime.now())
    filled = models.BooleanField(default=False)

class Subject(models.Model):
    org = models.ForeignKey(Organization, verbose_name="organization")
    name = models.CharField(max_length = 50)
    email = models.CharField(max_length = 85, null=True, blank=True)

class Candidate(Subject):
    vacancy = models.ForeignKey(Vacancy, null=True, blank=True)

Django中的search_fields在Django ModelAdmin中表现得很奇怪

0 个答案: