I have the following class models:
class DiagnosisDetail(Model):
__tablename__ = 'vw_svc_diagnosis'
diagnosis_id = Column(String(32), primary_key=True)
first_name = Column(String(255))
last_name = Column(String(255))
mrn = Column(String(255))
dx_code = Column(String(255))
dx_id = Column(String(255), ForeignKey('dx_group.dx_id'))
diagnosisgroup = relationship("DiagnosisGroup")
dx_code_type = Column(String(255))
dx_name = Column(String(255))
__mapper_args__ = {
"order_by":[mrn, dx_name]
}
class DiagnosisGroup(Model):
__tablename__ = 'diagnosis_group'
dx_id = Column(String(32), primary_key=True)
mrn = Column(String(255))
dx_code = Column(String(255))
dx_code_type = Column(String(255))
dx_name = Column(String(255))
diagnosis_datetime = Column(DateTime)
__mapper_args__ = {
"order_by":[mrn, dx_name]
}
where the underlying tables for DiagnosisGroup and DiagnosisDetail,
diagnosis_group, are SQL views. DiagnosisGroup is so that I can have a more
succinct view of the data, since a patient can have the same dx_code many
times. I am wondering if there is a way to do this within the class
structure for , instead of at the db server? I do not wish to do this
through any ORM session queries, since these two classes have distinct use
cases where they bind to wtform views. Thus, I would like to inherit the
properties of these two classes from another distinct class.
I have not been able to find anything like this, short of
[create-column-properties-that-use-a-groupby][1]
<http://stackoverflow.com/questions/25822393/how-can-i-create-column-properties-that-use-a-groupby/25879453>,
but this uses session queries to achieve the result. I would like to keep
everything within the class itself through inheritance of the
DiagnosisDetail class.
Note: the primary key for DiagnosisGroup, is a concatenation of dx_code and
another field patient_id. Groupings thus are unique. I do also need the FK
relation back to the DiagnosisDetail class, which leads me to believe there
should be three classes, where the two above classes inherit their
properties from a parent class.
--
SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
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