On Feb 18, 2014, at 4:59 AM, Adrian adrian.schre...@gmail.com wrote:
Hi guys,
After updating to 0.9.2 from 0.8 my custom compiles() are not working any
longer. The definition looks likes this:
@compiles(PrimaryKeyConstraint, postgresql)
def add_pg_primary_key_options(constraint, compiler, **kwargs):
ddl = compiler.visit_primary_key_constraint(constraint, **kwargs)
if 'postgresql_fillfactor' in constraint.kwargs:
fillfactor = constraint.kwargs.get('postgresql_fillfactor')
pos = ddl.index(')') + 1
ddl = ddl[:pos] + WITH (FILLFACTOR=%s) % fillfactor + ddl[pos:]
return ddl
But now I get this error:
sqlalchemy.exc.ArgumentError: Argument 'postgresql_fillfactor' is not
accepted by dialect 'postgresql' on behalf of class
'sqlalchemy.sql.schema.PrimaryKeyConstraint'
It seems the function itself is not executed at all. Are there any changes in
0.9+ I am not aware of that changed the compiles() behavior?
your function is fine but the issue is that PrimaryKeyConstraint here is
checking on that argument and raising right in the constructor, as we now check
on those arguments (see
http://docs.sqlalchemy.org/en/latest/changelog/changelog_09.html#change-2df4f7fe29c0f5aa2f957f4a89b0d74d
).
two options here are to add it in as an argument:
from sqlalchemy.dialects.postgresql import base
base.PGDialect.construct_arguments.append((PrimaryKeyConstraint, {fillfactor:
None}))
pk = PrimaryKeyConstraint('a', info=dict(postgresql_fillfactor='x'))
note the above should be considered a workaround; I should add an API feature
to support adding new arguments to dialects here. for now the above call has
to be before any schema objects are constructed or it won’t take effect.
the other option is to use .info instead (the inconvenience here is that ‘info’
isn’t accepted in the constructor…):
@compiles(PrimaryKeyConstraint, postgresql)
def add_pg_primary_key_options(constraint, compiler, **kwargs):
ddl = compiler.visit_primary_key_constraint(constraint, **kwargs)
if 'postgresql_fillfactor' in constraint.info:
fillfactor = constraint.info.get('postgresql_fillfactor')
pos = ddl.index(')') + 1
ddl = ddl[:pos] + WITH (FILLFACTOR=%s) % fillfactor + ddl[pos:]
return ddl
pk = PrimaryKeyConstraint('a')
pk.info['postgresql_fillfactor'] = 'x'
Thanks,
Adrian
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