On Thu, Jan 12, 2023, at 1:46 PM, [email protected] wrote:
> Hi Mike,
>
> Thanks. I have a few cases where it is easiest if I have a plain dict instead
> of a RowMapping. For example RowMapping is immutable, and isn't playing
> nicely with my json encoder.
>
> What is your preferred method to convert to a plain dict?
for row in result.mappings():
d = dict(row)
should do it
the row was not mutable in 1.4, 1.3, etc. either, what did you do then ?
>
> Row._asdict()
> dict(RowMapping.items())
> something else?
>
> Thanks and best regards,
>
> Matthew
>
>
> On Monday, January 9, 2023 at 6:00:08 PM UTC-8 Mike Bayer wrote:
>>
>>
>> On Mon, Jan 9, 2023, at 8:50 PM, [email protected] wrote:
>>> Hello,
>>>
>>> It looks like in 2.0 we can no longer treat a row.Row as a dict. I have a
>>> few cases where I want to do this, such as when I need to get a list of
>>> columns, or when I don't know the column name in advance.
>>>
>>> rows = conn.execute(select(t.c.foo)).fetchall()
>>>
>>> rows[0].keys() # Not Allowed
>>>
>>> rows[0][some_unknown_column] # not allowed
>>>
>>> If we need to treat it as a dict, are we supposed to be calling:
>>>
>>> rows[0]._asdict()
>>>
>>> This works, but the only issue is that our IDEs flag this as accessing a
>>> protected member of a class. Is there any alternative?
>>>
>>> Thanks and best regards,
>>
>> you have more options here than previously on how to treat rows, as tuples
>> or mappings, either up front or on a per-row basis. the new API has been
>> available as of version 1.4. Relevant links include:
>>
>> 1. announcement of change and rationale
>>
>> https://docs.sqlalchemy.org/en/14/changelog/migration_14.html#rowproxy-is-no-longer-a-proxy-is-now-called-row-and-behaves-like-an-enhanced-named-tuple
>>
>> 2. migration guide
>>
>> https://docs.sqlalchemy.org/en/14/changelog/migration_20.html#result-rows-act-like-named-tuples
>>
>> 3. new tutorial coverage
>>
>> https://docs.sqlalchemy.org/en/14/tutorial/dbapi_transactions.html#fetching-rows
>>
>> included is background on how to get mappings from a Row or how to get
>> RowMapping objects from a result up front using result.mappings().
>>
>>
>>
>>
>>
>>
>>>
>>> Matthew
>>>
>>>
>>> --
>>> SQLAlchemy -
>>> The Python SQL Toolkit and Object Relational Mapper
>>>
>>> http://www.sqlalchemy.org/
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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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--
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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