[pypy-dev] Django DateField default value and migrations fail

[William ML Leslie]

I took a look at the Django source.

There's code for serialising methods in Django that checks `if
isinstance(value, (types.FunctionType, types.BuiltinFunctionType))`
which succeeds on cpython because datetime.date.today is a
BuiltinFunctionType, wheras it's a types.MethodType on pypy.  Maybe
that check could be expanded to include MethodType.

Here's the code at master:

https://github.com/django/django/blob/3b383085fb89a48e756383e7cd5d3bd867353ba1/django/db/migrations/serializer.py#L379


On 17 August 2016 at 17:27, Sergey Kurdakov <sergey.forum at gmail.com> wrote:
> Hi William,
>
> here is my traceback in console
>
> Traceback (most recent call last):
>   File "manage.py", line 10, in <module>
>     execute_from_command_line(sys.argv)
>   File
> "/usr/local/lib/pypy2.7/dist-packages/django/core/management/__init__.py",
> line 353, in execute_from_command_line
>     utility.execute()
>   File
> "/usr/local/lib/pypy2.7/dist-packages/django/core/management/__init__.py",
> line 345, in execute
>     self.fetch_command(subcommand).run_from_argv(self.argv)
>   File
> "/usr/local/lib/pypy2.7/dist-packages/django/core/management/base.py", line
> 348, in run_from_argv
>     self.execute(*args, **cmd_options)
>   File
> "/usr/local/lib/pypy2.7/dist-packages/django/core/management/base.py", line
> 399, in execute
>     output = self.handle(*args, **options)
>   File
> "/usr/local/lib/pypy2.7/dist-packages/django/core/management/commands/makemigrations.py",
> line 150, in handle
>     self.write_migration_files(changes)
>   File
> "/usr/local/lib/pypy2.7/dist-packages/django/core/management/commands/makemigrations.py",
> line 178, in write_migration_files
>     migration_string = writer.as_string()
>   File
> "/usr/local/lib/pypy2.7/dist-packages/django/db/migrations/writer.py", line
> 167, in as_string
>     operation_string, operation_imports =
> OperationWriter(operation).serialize()
>   File
> "/usr/local/lib/pypy2.7/dist-packages/django/db/migrations/writer.py", line
> 124, in serialize
>     _write(arg_name, arg_value)
>   File
> "/usr/local/lib/pypy2.7/dist-packages/django/db/migrations/writer.py", line
> 76, in _write
>     arg_string, arg_imports = MigrationWriter.serialize(item)
>   File
> "/usr/local/lib/pypy2.7/dist-packages/django/db/migrations/writer.py", line
> 357, in serialize
>     item_string, item_imports = cls.serialize(item)
>   File
> "/usr/local/lib/pypy2.7/dist-packages/django/db/migrations/writer.py", line
> 433, in serialize
>     return cls.serialize_deconstructed(path, args, kwargs)
>   File
> "/usr/local/lib/pypy2.7/dist-packages/django/db/migrations/writer.py", line
> 318, in serialize_deconstructed
>     arg_string, arg_imports = cls.serialize(arg)
>   File
> "/usr/local/lib/pypy2.7/dist-packages/django/db/migrations/writer.py", line
> 540, in serialize
>     "topics/migrations/#migration-serializing" % (value, get_docs_version())
> ValueError: Cannot serialize: <bound method type.today of <class
> 'datetime.date'>>
>
>
>
> Regards
> Sergey
>
>
> On Wed, Aug 17, 2016 at 10:21 AM, William ML Leslie
> <william.leslie.ttg at gmail.com> wrote:
>>
>> On 17 August 2016 at 16:50, Sergey Kurdakov <sergey.forum at gmail.com>
>> wrote:
>> >
>> > still causes error of the kind:
>> >
>> > topics/migrations/#migration-serializing" % (value, get_docs_version())
>> > ValueError: Cannot serialize: <bound method type.today of <class
>> > 'datetime.date'
>>
>> Do you get a full traceback?  That would be much more useful for
>> tracking down the problem.
>>
>> --
>> William Leslie
>>
>> Notice:
>> Likely much of this email is, by the nature of copyright, covered
>> under copyright law.  You absolutely MAY reproduce any part of it in
>> accordance with the copyright law of the nation you are reading this
>> in.  Any attempt to DENY YOU THOSE RIGHTS would be illegal without
>> prior contractual agreement.
>
>



-- 
William Leslie

Notice:
Likely much of this email is, by the nature of copyright, covered
under copyright law.  You absolutely MAY reproduce any part of it in
accordance with the copyright law of the nation you are reading this
in.  Any attempt to DENY YOU THOSE RIGHTS would be illegal without
prior contractual agreement.