I tried google and look at the official documentation
http://docs.sqlalchemy.org/en/rel_1_0/orm/inheritance.html#eager-loading-of-specific-or-polymorphic-subtypes
there weren't any information on that.
On Mon, Jun 22, 2015 at 4:33 AM, Mike Bayer <mike...@zzzcomputing.com
<mailto:mike...@zzzcomputing.com>> wrote:
On 6/21/15 1:46 PM, Kevin Qiu wrote:
It's a test db, there's only one record being added to the table.
And I ensure that with a assertIn() test and it passes.
The original code was:
class Application(mydb.Model):
__tablename__ = 'APPLICATION'
app_id = mydb.Column(mydb.Integer, primary_key = True)#app_id =
mydb.Column(mydb.String(30), primary_key = True)
created_datetime = mydb.Column(mydb.DateTime(), primary_key = True)
class ProjectApp(Application):
__tablename__ = 'PROJECT_APP'
__table_args__ = (
mydb.ForeignKeyConstraint(
['app_id','created_datetime'],
['APPLICATION.app_id', 'APPLICATION.created_datetime']
),
)
app_id = mydb.Column(mydb.Integer, primary_key = True)
created_datetime = mydb.Column(mydb.DateTime(), primary_key = True)
c_supervisor = mydb.Column(mydb.String(62),
mydb.ForeignKey('C_SUPERVISOR.c_sup_email'))
def create_new_internship_app(self, student):
internship_app = ProjectApp(
app_id=None,
created_datetime=datetime.date.today(),
you are assigning a Date object to a DateTime column which is
critically part of the primary key. The row that comes back
therefore has a different primary key since date(Y, m, d) !=
datetime(Y, m, d, 0, 0, 0):
>>> import datetime
>>> d1 = datetime.date(2015, 5, 10)
>>> d2 = datetime.datetime(2015, 5, 10, 0, 0, 0)
>>> d1 == d2
False
>>> d1 == d2.date()
True
I'd try to avoid using dates/datetimes as parts of primary keys
because they are difficult to equate to each other, for this
reason as well as issues like microseconds present / non-present, etc.
sample instance keys:
(<class '__main__.ProjectApp'>, (2, datetime.date(2015, 6, 21)))
(<class '__main__.ProjectApp'>, (2, datetime.datetime(2015, 6, 21,
0, 0)))
#deadline_datetime=datetime.date.today() +
datetime.timedelta(days=PROCESS_TIMEFRAME[CASE_PRIORITY['Project
app']]),
c_supervisor=None,
u_supervisor=None,
proj_module=None,
proj_title='Internship',
proj_description='It\'s long story',
proj_salary='No salary',
proj_contract=None,
proj_insurance=None,
proj_s_date=datetime.date(2014,2,1),
proj_e_date=datetime.date(2014,5,30),
proj_h_date=datetime.date(2014,6,1),
#std_comment=None,
#std_document=None
)
mydb.session.add(internship_app)
mydb.session.commit()
internship_app_rst = mydb.session.query(ProjectApp).one()
self.assertIs(internship_app_rst, internship_app)
self.assertEquals(internship_app_rst.proj_s_date ,
internship_app.proj_s_date)
return internship_app
On Sunday, June 21, 2015 at 7:20:04 PM UTC+2, Michael Bayer wrote:
did you try adding an ORDER BY to that query? calling
query.first() will return only the first result in an
unordered list. It is essentially random.
On 6/21/15 12:45 PM, Kevin Qiu wrote:
I create a unit test that add new ProjApp object to the
database, but the returned object shows it is not the same
object inserted, I don't follow why it's like this because I
have others tests on inserting a row to a different table,
and returned shows the same row object.
Test result:
self.assertIs(internship_app_rst, internship_app)
AssertionError: <project.models.ProjectApp object at
0x0000000003EE7E10> is not <project.models.ProjectApp object
at 0x0
000000003EE7710>
Test:
def create_new_internship_app(self, student):
internship_app = ProjectApp(
app_id=None,
created_datetime=datetime.date.today(),
proj_title='Long story'
)
mydb.session.add(internship_app)
mydb.session.commit()
internship_app_rst = mydb.session.query(ProjectApp).first()
self.assertIs(internship_app_rst, internship_app)
Model:
class Application(mydb.Model):
__tablename__ = 'APPLICATION'
app_id = mydb.Column(mydb.Integer, primary_key = True)
created_datetime = mydb.Column(mydb.DateTime(), primary_key
= True)
app_description = mydb.Column(mydb.Text())
app_category = mydb.Column(mydb.String(30))
case_owner_obj = mydb.relationship('Staff',
backref='application_list')
__mapper_args__ = {
'polymorphic_identity':'application',
'polymorphic_on':app_category
}
class ProjectApp(Application):
__tablename__ = 'PROJECT_APP'
__table_args__ = (
mydb.ForeignKeyConstraint(
['app_id','created_datetime'],
['APPLICATION.app_id', 'APPLICATION.created_datetime']
),
)
app_id = mydb.Column(mydb.Integer, primary_key = True)
created_datetime = mydb.Column(mydb.DateTime(), primary_key
= True)
proj_title = mydb.Column(mydb.Text())
__mapper_args__ = {
'polymorphic_identity':'projApp',
}
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