我使用此SO question在Django应用程序中的mysql数据库上启用全文搜索。
# models.py
class CaseSnapshot(BaseModel):
text = models.TextField(blank=True)
class Search(models.Lookup):
lookup_name = "search"
def as_mysql(self, compiler, connection):
lhs, lhs_params = self.process_lhs(compiler, connection)
rhs, rhs_params = self.process_rhs(compiler, connection)
params = lhs_params + rhs_params
return f"MATCH (%s) AGAINST (%s IN BOOLEAN MODE)" % (lhs, rhs), params
models.TextField.register_lookup(Search)
因为Django在mysql上不支持全文搜索,所以我们必须添加索引,因此我们修改了生成的迁移文件:
# Generated by Django 2.2 on 2020-04-28 03:41
from django.db import migrations, models
# Table details
table_name = "by_api_casesnapshot"
field_name = "text"
index_name = f"{table_name}_{field_name}_index"
class Migration(migrations.Migration):
dependencies = [("by_api", "0033_add_tag_color")]
operations = [
migrations.CreateModel(...), # As auto-generated
migrations.RunSQL(
f"CREATE FULLTEXT INDEX {index_name} ON {table_name} ({field_name})",
f"DROP INDEX {index_name} ON {table_name}",
),
]
# dbshell
mysql> SHOW INDEX FROM by_api_casesnapshot;
+---------------------+--------------------------------+-------------+-----+------------+-----+
| Table | Key_name | Column_name | ... | Index_type | ... |
+---------------------+--------------------------------+-------------+-----+------------+-----+
| by_api_casesnapshot | PRIMARY | id | ... | BTREE | ... |
| by_api_casesnapshot | by_api_casesnapshot_text_index | text | ... | FULLTEXT | ... |
+---------------------+--------------------------------+-------------+-----+------------+-----+
#shell
>>> snap = CaseSnapshot.objects.create(text="XXX")
# Regular query first
>>> CaseSnapshot.objects.filter(text__contains="X")
<QuerySet [<CaseSnapshot pk=1>]>
# Now test custom search lookup
>>> CaseSnapshot.objects.filter(text__search="XXX")
<QuerySet [<CaseSnapshot pk=1>]>
>>> CaseSnapshot.objects.filter(text__search="X*")
<QuerySet [<CaseSnapshot pk=1>]>
>>> CaseSnapshot.objects.filter(text__search="X*").query.__str__()
'SELECT `by_api_casesnapshot`.`id`, `by_api_casesnapshot`.`text` FROM `by_api_casesnapshot` WHERE MATCH (`by_api_casesnapshot`.`text`) AGAINST (X* IN BOOLEAN M
ODE)'
到目前为止,所有操作都完全按预期进行。
这里是失败的地方-使用__search
查找的所有查询测试运行期间返回一个查询集空集,即使认为生成的查询是相同的。
from django.test import TestCase
from by_api.models import CaseSnapshot
class TestModels(TestCase):
def test_search(self):
CaseSnapshot.objects.create(text="XXX")
rv1 = CaseSnapshot.objects.filter(text__contains="XXX")
# Passes
self.assertEqual(rv1.count(), 1)
rv2 = CaseSnapshot.objects.filter(text__search="XXX")
# Fails - count i
self.assertEqual(rv2.count(), 1)
我尝试在测试运行中使用pdb调试它,并注意生成的查询与上面在shell环境中生成的查询相同:
>>> rv2.query.__str__())
'SELECT `by_api_casesnapshot`.`id`, `by_api_casesnapshot`.`text` FROM `by_api_casesnapshot` WHERE MATCH (`by_api_casesnapshot`.`text`) AGAINST (XXX IN BOOLEAN MODE)'
为什么在测试过程中使用__search
查找会产生空的查询集?
[我只是注意到如果我使用unittest.TestCase
而不是django.test.TestCase
,则测试通过-这可能与django的测试用例包装数据库事务有关吗?
Answer from Adam Chainz frmo django-mysql library:
InnoDB直到提交才对全文索引进行更改。您可以使用TransactionTestCase来解决此问题。
我将测试类更改为使用TransactionTestCase
,现在测试通过了。