POST 上的 SQLalchemy 检查记录是否已存在并发回现有记录
Sqlalchemy on POST check if record already exists and send back the existing record
我有几个端点遇到了相同类型的问题。检查记录是否已经存在。在这个特定的实例中,我正在验证是否已经将 url
具有相同值的记录添加到数据库中。
端点
api.add_resource(EventEntries, '/events/<int:event_id>/entries')
加载器
class Entry (Resource):
#RETURNS A SINGLE EVENT
def get(self, entry_id):
schema = EntrySchema()
result = db.session.query(EntryModel).filter(EntryModel.id == entry_id)
return schema.dump(result, many=True), 200
#PUTS A SINGLE EVENT
def put(self, entry_id):
event_id = event_id
title = request.json['title']
description = request.json['description']
type = request.json['type']
domain = request.json['domain']
language = request.json['language']
publishdate = request.json['publishdate']
url = request.json['url']
entry = EntryModel(event_id=event_id,title=title,description=description,type=type,domain=domain,language=language,publishdate=publishdate,url=url)
db.session.add(event)
db.session.commit()
data = ({'id' :entry.id,
'title': entry.title,
'description': entry.description,
'type': entry.type,
'domain': entry.domain,
'language': entry.language,
'publishdate': entry.publishdate,
'url': entry.url})
response = jsonify(data)
response.status_code = 200 # or 400 or whatever
return response
修改
我修改了上面的文件以包含以下行,这些行检查记录是否存在并尝试 return 该记录。这会导致即使条目不存在也会发回空数组。
# If record already exists
schema = EntrySchema()
result = db.session.query(EntryModel).filter(EntryModel.url == request.json['url'])
print(result)
print(request.json['url'])
if result is not None:
print("Record Already exists")
return schema.dump(result, many=True), 200
else:
已修复:
我添加了这个而不是上面的建议。
# If record already exists
schema = EntrySchema()
result = db.session.query(EntryModel).filter(EntryModel.url == request.json['url']).first()
print(result)
if not result is None:
print("Record Already exists")
return schema.dump(result, many=False), 200
我有几个端点遇到了相同类型的问题。检查记录是否已经存在。在这个特定的实例中,我正在验证是否已经将 url
具有相同值的记录添加到数据库中。
端点
api.add_resource(EventEntries, '/events/<int:event_id>/entries')
加载器
class Entry (Resource):
#RETURNS A SINGLE EVENT
def get(self, entry_id):
schema = EntrySchema()
result = db.session.query(EntryModel).filter(EntryModel.id == entry_id)
return schema.dump(result, many=True), 200
#PUTS A SINGLE EVENT
def put(self, entry_id):
event_id = event_id
title = request.json['title']
description = request.json['description']
type = request.json['type']
domain = request.json['domain']
language = request.json['language']
publishdate = request.json['publishdate']
url = request.json['url']
entry = EntryModel(event_id=event_id,title=title,description=description,type=type,domain=domain,language=language,publishdate=publishdate,url=url)
db.session.add(event)
db.session.commit()
data = ({'id' :entry.id,
'title': entry.title,
'description': entry.description,
'type': entry.type,
'domain': entry.domain,
'language': entry.language,
'publishdate': entry.publishdate,
'url': entry.url})
response = jsonify(data)
response.status_code = 200 # or 400 or whatever
return response
修改
我修改了上面的文件以包含以下行,这些行检查记录是否存在并尝试 return 该记录。这会导致即使条目不存在也会发回空数组。
# If record already exists
schema = EntrySchema()
result = db.session.query(EntryModel).filter(EntryModel.url == request.json['url'])
print(result)
print(request.json['url'])
if result is not None:
print("Record Already exists")
return schema.dump(result, many=True), 200
else:
已修复:
我添加了这个而不是上面的建议。
# If record already exists
schema = EntrySchema()
result = db.session.query(EntryModel).filter(EntryModel.url == request.json['url']).first()
print(result)
if not result is None:
print("Record Already exists")
return schema.dump(result, many=False), 200