Hi, welcome to Python and SQLAlchemy :-)
If you want to do some extra filtering on the results, you can iterate
over the results, decide whether each item matches your filter
conditions, and if it does, append it to a new list, something like
this:
filtered_results = []
for part in query.all():
if <your filter conditions go here>:
filtered_results.append(part)
You can add new properties and methods to your BLPart class. The exact
syntax would depend on how you want to use them. Here's the simplest
example:
class BLPart(db.Model):
# column definitions etc.
ITEMTYPE = Column(...)
# Non-db attributes
foreground = "#000"
background = "#fff"
Now every BLPart instance will have "foreground" and "background"
attributes with those values.
If you need something more complicated than that, let us know how you
would want to use them.
Hope that helps,
Simon
On Sun, Feb 20, 2022 at 9:37 PM Cp Divers <cpdiv...@gmail.com> wrote:
>
> Hello Guys, this is my very first post here. I'm not sure this the the right
> place. I'm a week old with Python and SQLAlchemy. And I believe I'm missing a
> couple concept, hopefully you can help|
>
> I do have this class
>
> class BLPart(db.Model):
> __tablename__ = 'BL_parts'
>
> ITEMTYPE = Column(String(1, 'utf8mb4_unicode_ci'), nullable=False)
> ITEMID = Column(String(20, 'utf8mb4_unicode_ci'), primary_key=True)
> ITEMDESC = Column(Text(collation='utf8mb4_unicode_ci'), nullable=False,
> index=True)
> CATEGORY = Column(ForeignKey('BL_categories.category_id'),
> nullable=False, index=True, server_default=text("0"))
> ITEMWEIGHT = Column(String(10, 'utf8mb4_unicode_ci'))
> ITEMDIMX = Column(Float, server_default=text("0"))
> ITEMDIMY = Column(Float, server_default=text("0"))
> ITEMDIMZ = Column(Float, server_default=text("0"))
> In my code python code I got something like this:
>
> if form.validate_onsubmit():
> search = form.search.data.strip()
> query = db.session.query(BLPart).filter(
> or(
> BLPart.ITEMDESC.contains(search, autoescape=True),
> BLPart.ITEMID.contains(search, autoescape=True)
> )
> )
>
> results= query.all()
> print(type(results)) #<class 'list'>
> print(results) #[<BLPart 3005>, <BLPart 30055>, <BLPart 30056>, <BLPart
> 3005f1>, <BLPart 3005f2>, <BLPart 3005f3>, <BLPart 3005pb001>, <BLPa
>
> Here are my 2 main questions,
>
> 1) I do have some 'smart' filtering that I would like to do after I get the
> results
> Based on that filter I'd like to remove some rows from the results variables
>
> 2) In my class, I have 8 columns, based on my filtering I want to create a
> new 'virtual' column which does not exist in the DB
> Let's say I want to create a Foreground color and a background color 'column'
> in the results variable
> How can I achieve this ?
>
>
> --
> 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.
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--
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.
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