を操作するためのCRUD APIを作成しましたdatabase。テーブルのRetrieve（または読み取り）は、現在問題を引き起こしています。設計に関する背景: には、値を受け入れる目的でメイン ファイル (object.py) から継承する便利なファイルもあります。functionclassassessment_resultsAPIstring
実行する必要があること:IDおよび/または 2 つの引数をチェックします (ID が使用されていない必要があります)。該当する場合は、その詳細と一緒に取得します。Pythonのドキュメントに従って、*オプションの位置引数を許可する引数を導入しました。私もこの素晴らしいチュートリアルから助けられました。(私は、dbs の設計と構築、および python の使用の初心者です。)
create_category_rating(...)取得メソッドは機能していると思いますが、Tracebackが を返すようになったため、設計またはメソッドに欠陥があるに違いありませんValueError。ここでStacks (同様の問題)を読んで、 args に値を割り当てる必要があるかもしれませんが、API を使用しているようです。
コードは次のとおりです。
object.py
(retrieve メソッドと create_category_rating メソッド):
def retrieve_assessment_results(self, something_unique, *args):
if isinstance(something_unique, int):
return self.session.query(Assessment_Results).\
filter(Assessment_Results.id == something_unique).one()
elif isinstance(something_unique, basestring) and isinstance(args, basestring):
return self.session.query(Assessment_Results).\
filter(Assessment_Results.owner == something_unique).\
filter(Assessment_Results.assessment == args).one()
elif isinstance(something_unique, Assessment_Results) and isinstance(args, Assessment_Results):
return something_unique, args
else:
raise ValueError('Value being passed is an object')
def create_category_rating(self, category_rating_int, category, assessment_results):
new_catrating = Category_Rating(category_rating_int, category, assessment_results)
self.session.add(new_catrating)
print(new_catrating)
self.session.commit()
return(new_catrating)
便利.py ( object.py から継承)
def create_category_rating(self, category_rating_int, category_name, username, name):
category = self.retrieve_category(category_name)
owner = self.retrieve_user(username)
assessment = self.retrieve_assessment(name)
assessment_results = self.retrieve_assessment_results(owner, assessment)
return super(ConvenienceAPI, self).create_category_rating(category_rating_int, category, assessment_results)
test.py
api = ConvenienceAPI()
api.create_category_rating(2, 'Decision-Making', 'baseball', 'Becoming a Leader')
現在の問題: StatementError 提案に従って、条件を変更しました (アンパックして、*args で指定されたタプルを割り当てる必要があります)。
新しい API:
def retrieve_assessment_results(self, *args):
id, assessment, owner = None, None, None
if len(args) == 1:
id, = args[0]
elif len(args) == 2:
assessment, owner = args
else:
raise ValueError('Value being passed is an object')
if id is not None:
return self.session.query(Assessment_Results).\
filter(Assessment_Results.id == id).one()
elif assessment is not None:
return self.session.query(Assessment_Results).\
filter(Assessment_Results.assessment == assessment).one()
elif owner is not None:
return self.session.query(Assessment_Results).\
filter(Assessment_Results.owner == owner).one()
トレースバック:
Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/nose/case.py", line 197, in runTest
self.test(*self.arg)
File "/Users/ack/code/venv/NotssDB/notssdb/test/test.py", line 111, in test1
api.create_category_rating(2, 'Decision-Making', 'baseball', 'Becoming a Leader')
File "/Users/ack/code/venv/NotssDB/notssdb/api/convenience.py", line 41, in create_category_rating
assessment_results = self.retrieve_assessment_results(owner, assessment)
File "/Users/ack/code/venv/NotssDB/notssdb/api/object.py", line 323, in retrieve_assessment_results
filter(Assessment_Results.assessment == assessment).one()
File "/usr/local/lib/python2.7/site-packages/sqlalchemy/orm/query.py", line 2472, in one
ret = list(self)
File "/usr/local/lib/python2.7/site-packages/sqlalchemy/orm/query.py", line 2515, in __iter__
return self._execute_and_instances(context)
File "/usr/local/lib/python2.7/site-packages/sqlalchemy/orm/query.py", line 2530, in _execute_and_instances
result = conn.execute(querycontext.statement, self._params)
File "/usr/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 914, in execute
return meth(self, multiparams, params)
File "/usr/local/lib/python2.7/site-packages/sqlalchemy/sql/elements.py", line 323, in _execute_on_connection
return connection._execute_clauseelement(self, multiparams, params)
File "/usr/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 1010, in _execute_clauseelement
compiled_sql, distilled_params
File "/usr/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 1078, in _execute_context
None, None)
File "/usr/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 1339, in _handle_dbapi_exception
exc_info
File "/usr/local/lib/python2.7/site-packages/sqlalchemy/util/compat.py", line 199, in raise_from_cause
reraise(type(exception), exception, tb=exc_tb)
File "/usr/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 1073, in _execute_context
context = constructor(dialect, self, conn, *args)
File "/usr/local/lib/python2.7/site-packages/sqlalchemy/engine/default.py", line 544, in _init_compiled
grp, m in enumerate(parameters)]
File "/usr/local/lib/python2.7/site-packages/sqlalchemy/sql/compiler.py", line 498, in construct_params
pd[self.bind_names[bindparam]] = bindparam.effective_value
File "/usr/local/lib/python2.7/site-packages/sqlalchemy/sql/elements.py", line 1162, in effective_value
return self.callable()
File "/usr/local/lib/python2.7/site-packages/sqlalchemy/orm/relationships.py", line 1386, in _go
value = fn(*arg, **kw)
File "/usr/local/lib/python2.7/site-packages/sqlalchemy/orm/mapper.py", line 2422, in _get_state_attr_by_column
return state.manager[prop.key].impl.get(state, dict_, passive=passive)
StatementError: (exceptions.KeyError) 'assessment_id' [SQL: u'SELECT assessment_results.id AS assessment_results_id, assessment_results.created_on AS assessment_results_created_on, assessment_results.owner_id AS assessment_results_owner_id, assessment_results.assessment_id AS assessment_results_assessment_id \nFROM assessment_results \nWHERE ? = assessment_results.assessment_id'] [parameters: [immutabledict({})]]