That’s a result of the lack of block scoping in Python. `op` is going to
resolve when the lambda first executes, which is always after the loop has
finished, and scoped to the containing function so `op` will always be the
final loop value.
Easiest workaround is to just wrap the loop contents in a function, so you get
a fresh scope for each permutation.
def make_routes(config, cat, op):
config.add_route…
for cat in ('actes', 'constats'):
for op in ('archive', 'unarchive’):
make_routes(config, cat, op)
— Theron
> On Mar 13, 2024, at 4:36 PM, Laurent Daverio <[email protected]> wrote:
>
> Thank you everybody, I'll try to set up a working example tomorrow.
>
> Actually you're right, my question was formulated incorrectly, it may not be
> a question of lambdas. Basically, I was trying to create a series of routes
> in a reasonably concise way, something like this : 2 types of objects (actes,
> constats), 2 operations (archive, unarchive), 2 variants (handle one object,
> or handle a list of ids):
>
> - /actes/{id}/archive
> - /actes/{id}/unarchive
> - /constats/{id}/archive
> - /constats/{id}/unarchive
> - /actes/-/archive_selection
> - /actes/-/unarchive_selection
> - /constats/-/archive_selection
> - /constats/-/unarchive_selection
>
> ```
>
> factories = {'actes': {'fact': acte_factory,
> 'rsrc': ActeResource},
> 'constats': {'fact': constat_factory,
> 'rsrc': ConstatResource}}
>
> functions = {'archive': (_archive, _archive_multi),
> 'unarchive': (_unarchive, _unarchive_multi)}
>
> for cat in ('actes', 'constats'):
> for op in ('archive', 'unarchive'):
>
> route_name: str = f'api.{cat}.{op}'
>
> config.add_route(route_name, f'/{cat}/{{id}}/{op}',
> factory=factories[cat]['fact'])
> config.add_view(functions[op][0], route_name=route_name,
> request_method='GET', renderer='json')
>
> config.add_route(route_name + '_selection',
> f'/{cat}/-/{op}_selection')
> config.add_view(
> lambda request: functions[op][1](request, factories[cat]['rsrc']),
> route_name=route_name + '_selection', request_method='POST',
> renderer='json')
>
> ```
>
> The first 4 routes (those with "{id}" in them) worked fine, but last 4 (those
> using lambdas) were all mapped to the same function (`_unarchive_multi`) in
> the end.
>
> In order to make them work, I had to unroll the loops and enumerate
> everything. Ugly :(
>
> ```
> config.add_route('api.actes.archive_selection', '/actes/-/archive_selection')
> config.add_route('api.constats.archive_selection',
> '/constats/-/archive_selection')
> config.add_view(
> lambda request: _archive_multi(request, ActeResource),
> route_name='api.actes.archive_selection', request_method='POST',
> renderer='json')
> config.add_view(
> lambda request: _archive_multi(request, ConstatResource),
> route_name='api.constats.archive_selection', request_method='POST',
> renderer='json')
>
> config.add_route('api.actes.unarchive_selection',
> '/actes/-/unarchive_selection')
> config.add_route('api.constats.unarchive_selection',
> '/constats/-/unarchive_selection')
> config.add_view(
> lambda request: _unarchive_multi(request, ActeResource),
> route_name='api.actes.unarchive_selection', request_method='POST',
> renderer='json')
> config.add_view(
> lambda request: _unarchive_multi(request, ConstatResource),
> route_name='api.constats.unarchive_selection', request_method='POST',
> renderer='json')
> ```
>
> Laurent.
>
>
>
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