On 04/24/2017 03:42 PM, Greg Silverman wrote:
My naive first response would be that I want the class to look like
class DiagnosisTest(Model):
__tablename__= 'vw_svc_diagnosis'
#id = Column(Integer, primary_key=True, autoincrement=True)
dx_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_code_orig = Column(String(255))
dx_code_type= Column(String(255))
dx_name= Column(String(255))
#chronic_diagnosis_yn = Column(String(255))
diagnosis_datetime= Column(DateTime)
@property
def get_diagnosis_groups(self):
import itertoolsas itertools
for (dx_code, patient_id), detailsin itertools.groupby(self, keyfunc):
diagnosis_group = DiagnosisGroup(
dx_code, patient_id
)
diagnosis_group.details= details
for detailin details:
detail.group= diagnosis_group
yield diagnosis_group
So that I could then instantiate this and access grouped elements like
DiagnosisTest.get_diagnosis_groups.patient_id and
DiagnosisTest.get_diagnosis_groups.dx_code for example.
OK can you add a relationship() to DiagnosisTest that returns a list of
DiagnosisDetail objects? that would be all you need here.
I am sure this does not answer your question, but what I really want to
do is have the data grouped within the class and available whenever I
instantiate the class.
I know what I need, but I am having problems in articulating the details.
Thanks for being patient with me! ^_^
On Mon, Apr 24, 2017 at 12:21 PM, mike bayer <mike...@zzzcomputing.com
<mailto:mike...@zzzcomputing.com>> wrote:
On 04/24/2017 12:51 PM, Greg Silverman wrote:
Hi Mike,
I'm finally getting to this. Instead of having both a detail
and grouped methods, I would like to have only the grouped
method. I'm not sure I follow your suggestion for the two
methods above and how that would be modified to fit into the
@property in my class.
Could you please elaborate a bit how these would work within
context of the class?
cutting and pasting:
def get_diagnosis_groups(sorted_list_of_diagnosis_detail):
for (dx_code, patient_id), details in
itertools.groupby(sorted_list_of_diagnosisdetail, keyfunc):
diagnosis_group = DiagnosisGroup(
dx_code, patient_id
)
diagnosis_group.details = details
for detail in details:
detail.group = diagnosis_group
yield diagnosis_group
you want to take out the "sorted_list_of_diagnosis_detail" argument.
OK....but I don't know where you'd like to get this from. Where is
this "method" going and are you calling that as a classmethod or an
instance method? what class? Just show a usage example.
Thanks!
Greg--
On Wed, Mar 1, 2017 at 8:53 PM, mike bayer
<mike...@zzzcomputing.com <mailto:mike...@zzzcomputing.com>
<mailto:mike...@zzzcomputing.com
<mailto:mike...@zzzcomputing.com>>> wrote:
On 03/01/2017 08:27 PM, GMS wrote:
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 are
SQL views. DiagnosisGroup is so that I can have a more
succinct
view of
the data, since a patient can have the same diagnosis many
times. I am
wondering if there is a way to do this within the class
structure
instead of at the db server?
do you mean, derive a DiagnosisGroup object from a
DiagnosisDetail
without running SQL? (or a list of them?) (the answer
is..sure? just build Python code to generate objects from a
list of
DiagnosisDetail objects).
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
<http://stackoverflow.com/questions/25822393/how-can-i-create-column-properties-that-use-a-groupby/25879453>
<http://stackoverflow.com/questions/25822393/how-can-i-create-column-properties-that-use-a-groupby/25879453
<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.
You don't need a relational database to do grouping, if you
have a
list of data in memory it can be grouped using sets, or most
succinctly Python's own groupby function:
https://docs.python.org/2/library/itertools.html#itertools.groupby
<https://docs.python.org/2/library/itertools.html#itertools.groupby>
<https://docs.python.org/2/library/itertools.html#itertools.groupby
<https://docs.python.org/2/library/itertools.html#itertools.groupby>>
Note: the primary key for DiagnosisGroup, is a
concatenation of
dx_code
and another field patient_id. Groupings thus are unique.
OK, so
def keyfunc(detail):
return (detail.dx_code, detail.patient_id)
def get_diagnosis_groups(sorted_list_of_diagnosis_detail):
for (dx_code, patient_id), details in
itertools.groupby(sorted_list_of_diagnosisdetail, keyfunc):
diagnosis_group = DiagnosisGroup(
dx_code, patient_id
)
diagnosis_group.details = details
for detail in details:
detail.group = diagnosis_group
yield diagnosis_group
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.
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