Broken gridDist in PICMI

[pordyna]

#5502 broke with c9c2f97 setting grid distirbution in PICMI.

Since #5502 a gridDist different than None will result in an error like:

jsonschema.exceptions.ValidationError: {'x': [{'device_cells': 464}, {'device_cells': 456}, {'device_cells': 456}, {'device_cells': 456}, {'device_cells': 464}, {'device_cells': 456}, {'device_cells': 456}, {'device_cells': 456}], 'y': [{'device_cells': 1176}, {'device_cells': 1176}, {'device_cells': 1176}, {'device_cells': 1168}], 'z': [{'device_cells': 64}]} is not valid under any of the given schemas

Failed validating 'anyOf' in schema['properties']['grid_dist']:
    {'anyOf': [{'maxItems': 3,
                'minItems': 3,
                'prefixItems': [{'items': {'type': 'integer'},
                                 'type': 'array'},
                                {'items': {'type': 'integer'},
                                 'type': 'array'},
                                {'items': {'type': 'integer'},
                                 'type': 'array'}],
                'type': 'array'},
               {'type': 'null'}],
     'default': None,
     'title': 'Grid Dist'}

On instance['grid_dist']:
    {'x': [{'device_cells': 464},
           {'device_cells': 456},
           {'device_cells': 456},
           {'device_cells': 456},
           {'device_cells': 464},
           {'device_cells': 456},
           {'device_cells': 456},
           {'device_cells': 456}],
     'y': [{'device_cells': 1176},
           {'device_cells': 1176},
           {'device_cells': 1176},
           {'device_cells': 1168}],
     'z': [{'device_cells': 64}]}

Adding back the old schema with

git checkout 30531894b649e39ec5adf9d0c3f79b3256ad80ca -- share/picongpu/pypicongpu/schema/grid.Gri
d3D.json

"fixes" the issue.

It looks like the pydantic generates a wrong schema for this class. It ignores the change in the structure that is happening in serialization.

[chillenzer]

Thanks for pointing this out!