Django 单元测试 : South-migrated DB works in MySQL, 在 PostGreSQL 中抛出重复的 PK 错误。我错过了什么还是这是一个错误？

Question

(值得从免责声明开始:我是 PostGreSQL 的新手)

我有一个 Django 站点，其中包含一个标准的 app/tests.py 测试文件。如果我将数据库迁移到 MySQL(通过 South)，测试全部通过。

但是在 PostGresQL 中，我收到以下错误:

IntegrityError: duplicate key value violates unique constraint "business_contact_pkey"

请注意，这仅发生在单元测试时 - 实际页面在 MySQL 和 PostGresql 中运行良好。

弄清楚这一点真的很费时间。有人有想法吗？以下是 Postgresql“\d business_contact”和违规的 tests.py 方法(如果有帮助的话)。除了(相同的)南迁移之外，没有对任何一个数据库进行任何更改

谢谢

 first_name   | character varying(200)   | not null
 mobile_phone | character varying(100)   | 
 surname      | character varying(200)   | not null
 business_id  | integer                  | not null
 created      | timestamp with time zone | not null
 deleted      | boolean                  | not null default false
 updated      | timestamp with time zone | not null
 slug         | character varying(150)   | not null
 phone        | character varying(100)   | 
 email        | character varying(75)    | 
 id           | integer                  | not null default nextval('business_contact_id_seq'::regclass)
Indexes:
    "business_contact_pkey" PRIMARY KEY, btree (id)
    "business_contact_slug_key" UNIQUE, btree (slug)
    "business_contact_business_id" btree (business_id)
Foreign-key constraints:
    "business_id_refs_id_772cc1b7b40f4b36" FOREIGN KEY (business_id) REFERENCES business(id) DEFERRABLE INITIALLY DEFERRED
Referenced by:
    TABLE "business" CONSTRAINT "primary_contact_id_refs_id_dfaf59c4041c850" FOREIGN KEY (primary_contact_id) REFERENCES business_contact(id) DEFERRABLE INITIALLY DEFERRED

测试防御:

   def test_add_business_contact(self):
        """ Add a business contact """
        contact_slug = 'test-new-contact-added-new-adf'
        business_id = 1
        business = Business.objects.get(id=business_id)
        postdata = {
                'first_name': 'Test',
                'surname': 'User',
                'business': '1',
                'slug': contact_slug,
                'email': 'test@example.com',
                'phone': '12345678',
                'mobile_phone': '9823452',
                'business': 1,
                'business_id': 1,
                }

        #Test to ensure contacts that should not exist are not returned
        contact_not_exists = Contact.objects.filter(slug=contact_slug)
        self.assertFalse(contact_not_exists)

        #Add the contact and ensure it is present in the DB afterwards """
        contact_add_url = '%s%s/contact/add/' % (settings.BUSINESS_URL, business.slug)
        self.client.post(contact_add_url, postdata)
        added_contact = Contact.objects.filter(slug=contact_slug)
        print added_contact

        try:
            self.assertTrue(added_contact)
        except:
            formset = ContactForm(postdata)
            print formset.errors
            self.assertFalse(True, "Contact not found in the database - most likely, the post values in the test didn't validate against the form")

Answer 1

找到答案 - 我想我会把它留在这里留给后代。

在南方，我明确设置了数据迁移的主键 ID。 PGSQL 的排序器没有挑选它们，而是试图使用已经在数据迁移中设置的 PK 值。

从数据迁移中删除显式设置的主键值解决了这个问题。