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>> 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>>,
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>
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.
--
SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
To post example code, please provide an MCVE: Minimal, Complete, and
Verifiable Example. See http://stackoverflow.com/help/mcve
<http://stackoverflow.com/help/mcve> for a full
description.
---
You received this message because you are subscribed to the Google
Groups "sqlalchemy" group.
To unsubscribe from this group and stop receiving emails from
it, send
an email to sqlalchemy+unsubscr...@googlegroups.com
<mailto:sqlalchemy%2bunsubscr...@googlegroups.com>
<mailto:sqlalchemy+unsubscr...@googlegroups.com
<mailto:sqlalchemy%2bunsubscr...@googlegroups.com>>.
To post to this group, send email to sqlalchemy@googlegroups.com
<mailto:sqlalchemy@googlegroups.com>
<mailto:sqlalchemy@googlegroups.com
<mailto:sqlalchemy@googlegroups.com>>.
Visit this group at https://groups.google.com/group/sqlalchemy
<https://groups.google.com/group/sqlalchemy>.
For more options, visit https://groups.google.com/d/optout
<https://groups.google.com/d/optout>.
--
SQLAlchemy - The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
To post example code, please provide an MCVE: Minimal, Complete, and
Verifiable Example. See http://stackoverflow.com/help/mcve
<http://stackoverflow.com/help/mcve> for a full description.
--- You received this message because you are subscribed to a topic
in the Google Groups "sqlalchemy" group.
To unsubscribe from this topic, visit
https://groups.google.com/d/topic/sqlalchemy/t124IuWhNI0/unsubscribe
<https://groups.google.com/d/topic/sqlalchemy/t124IuWhNI0/unsubscribe>.
To unsubscribe from this group and all its topics, send an email to
sqlalchemy+unsubscr...@googlegroups.com
<mailto:sqlalchemy%2bunsubscr...@googlegroups.com>.
To post to this group, send email to sqlalchemy@googlegroups.com
<mailto:sqlalchemy@googlegroups.com>.
Visit this group at https://groups.google.com/group/sqlalchemy
<https://groups.google.com/group/sqlalchemy>.
For more options, visit https://groups.google.com/d/optout
<https://groups.google.com/d/optout>.
--
Greg M. Silverman
› flora-script <http://flora-script.grenzi.org/> ‹
**› grenzi.org <http://grenzi.org/> ›
--
SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
To post example code, please provide an MCVE: Minimal, Complete, and
Verifiable Example. See http://stackoverflow.com/help/mcve for a full
description.
---
You received this message because you are subscribed to the Google
Groups "sqlalchemy" group.
To unsubscribe from this group and stop receiving emails from it, send
an email to sqlalchemy+unsubscr...@googlegroups.com
<mailto:sqlalchemy+unsubscr...@googlegroups.com>.
To post to this group, send email to sqlalchemy@googlegroups.com
<mailto:sqlalchemy@googlegroups.com>.
Visit this group at https://groups.google.com/group/sqlalchemy.
For more options, visit https://groups.google.com/d/optout.
--
SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
To post example code, please provide an MCVE: Minimal, Complete, and Verifiable
Example. See http://stackoverflow.com/help/mcve for a full description.
---
You received this message because you are subscribed to the Google Groups "sqlalchemy" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to sqlalchemy+unsubscr...@googlegroups.com.
To post to this group, send email to sqlalchemy@googlegroups.com.
Visit this group at https://groups.google.com/group/sqlalchemy.
For more options, visit https://groups.google.com/d/optout.
