Python 如何配置Tastypie以将字段视为唯一字段?
如何配置Tastypie以将字段视为唯一字段?如果我尝试为标记为唯一的字段插入重复条目,我的期望是收到某种非500错误(可能是409冲突?)作为响应Python 如何配置Tastypie以将字段视为唯一字段?,python,django,tastypie,Python,Django,Tastypie,如何配置Tastypie以将字段视为唯一字段?如果我尝试为标记为唯一的字段插入重复条目,我的期望是收到某种非500错误(可能是409冲突?)作为响应 我已经看过了这些文件,看起来我应该很清楚,但由于某些原因,我没有得到我期望看到的回应 以下是文档链接: 示例代码如下所示: url.py v1_api = Api(api_name='v1') v1_api.register(CompanyResource()) urlpatterns = patterns('', (r'^api/
我已经看过了这些文件,看起来我应该很清楚,但由于某些原因,我没有得到我期望看到的回应 以下是文档链接:
示例代码如下所示: url.py
v1_api = Api(api_name='v1')
v1_api.register(CompanyResource())
urlpatterns = patterns('',
(r'^api/', include(v1_api.urls)),
)
resource.py
class CompanyResource(ModelResource):
CompanyName = fields.CharField(attribute='company_name')
CompanyId = fields.CharField(attribute='company_id', unique=True)
Contact = fields.CharField(attribute='contact')
Email = fields.CharField(attribute='email')
Phone = fields.CharField(attribute='phone')
class Meta:
queryset = Company.objects.all()
authentication = BasicAuthentication()
authorization = Authorization()
allowed_methods = ['get', 'post']
models.py
class Company(models.Model):
company_name = models.TextField(default=None, blank=True, null=True)
company_id = models.CharField(default='', unique=True, db_index=True, max_length=20)
contact = models.TextField(default=None, blank=True, null=True)
email = models.EmailField(default=None, blank=True, null=True)
phone = models.TextField(default=None, blank=True, null=True)
我收到的错误如下(使用curl访问我的本地服务):
curl--dump header--H“内容类型:application/json”-X POST--user-user:password--data'{“CompanyName”:“company”,“CompanyId”:“1234567890”,“Contact”:“John”,“Email”:example@example.com“,”电话“:“555-555-5555”}”http://localhost:8000/api/v1/company/
HTTP/1.0 500内部服务器错误
日期:2011年9月15日星期四18:25:20 GMT
服务器:WSGIServer/0.1 Python/2.7.1
内容类型:application/json;字符集=utf-8
{“错误消息”:(1062,\“重复条目'1234567890'用于键'api\公司\公司id\ uniq'\”),
......
raise ERRORCASE,errorvalue\n\n集成错误:(1062,\“重复条目'1234567890'用于键'api\U company\U company\U id\U uniq'\”)\n“}
当我从公司模型中删除
unique=True,db_index=True,
时,我没有收到完整性错误,而是创建了一个新的重复资源。同样,这不是预期的结果,因为我希望unique执行一些验证并引起一些非500响应。以下是我解决问题的方法:
基于用于验证的文档,我能够实现一个自定义验证器,该验证器为我检查字段的唯一性。
在CompanyResource中,我向meta类添加了CustomValidation。我将CustomValidation的实现放在validations.py文件中。如果isValid返回错误,api将返回400,其中包含错误中包含的消息
class CompanyResource(ModelResource):
"""
CompanyIds should be unique
"""
CompanyName = fields.CharField(attribute='company_name')
CompanyId = fields.CharField(attribute='company_id', unique=True)
Contact = fields.CharField(attribute='contact')
Email = fields.CharField(attribute='email')
Phone = fields.CharField(attribute='phone')
class Meta:
queryset = Company.objects.all()
authentication = BasicAuthentication()
authorization = Authorization()
allowed_methods = ['get', 'post']
validation = CustomValidation()
validations.py
class CustomValidation(Validation):
"""
The custom validation checks two things:
1) that there is data
2) that the CompanyId exists (unique check)
"""
def is_valid(self, bundle, request=None):
if not bundle.data:
return {'__all__': 'Missing data, please include CompanyName, CompanyId, Contact, Email, and Phone.'}
errors = {}
company_id=bundle.data.get('CompanyId', None)
# manager method, returns true if the company exists, false otherwise
if Company.objects.company_exists(company_id):
errors['CompanyId']='Duplicate CompanyId, CompanyId %s already exists.' % company_id
return errors
我今天也遇到了同样的问题。以下是我如何处理的: 覆盖资源定义中的[request\u method]\uRequest\u type]方法。例如,我覆盖FooResource中的post\u列表:
def post_list(self, request, **kwargs):
from django.db import IntegrityError
try:
return super(FooResource, self).post_list(request, **kwargs)
except IntegrityError, e:
if e.args[0] == 1062:
return http.HttpConflict()
希望它对您有用。出于价值考虑,我创建了一个稍有不同的解决方案,对我更有效。它基于thoslin的答案 我发现e.args[0]==1062检查对我来说失败了。我很确定这是一个MySQL错误,我正在使用Postgres 我还在obj_create方法中实现了这一点,这样它将处理所有对象的创建,而不仅仅是通过post_list完成的创建
from tastypie.exceptions import ImmediateHttpResponse
from tastypie.http import HttpConflict
from django.db import IntegrityError
...
class MyBaseResource(ModelResource):
def obj_create(self, bundle, **kwargs):
try:
return super(MyBaseResource, self).obj_create(bundle, **kwargs)
except IntegrityError, e:
if e.args[0] == 1062 or e.args[0].startswith('duplicate key'):
raise ImmediateHttpResponse(HttpConflict())
...
class MyResource(MyBaseResource):
[usual resource stuff]
对于定义为blank=True的模型字段,我也面临着同样的问题。Tastypie正在使用空白条目创建记录。我的答案是使用validation=FormValidation(form\u class=)。这会根据模型的字段进行验证。不会。如果需要PUT支持,则需要使用上面的“thoslins”方法。为什么选择在方法中导入IntegrityError?
from tastypie.exceptions import ImmediateHttpResponse
from tastypie.http import HttpConflict
from django.db import IntegrityError
...
class MyBaseResource(ModelResource):
def obj_create(self, bundle, **kwargs):
try:
return super(MyBaseResource, self).obj_create(bundle, **kwargs)
except IntegrityError, e:
if e.args[0] == 1062 or e.args[0].startswith('duplicate key'):
raise ImmediateHttpResponse(HttpConflict())
...
class MyResource(MyBaseResource):
[usual resource stuff]