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fixed issue on multi select field while selecting single item #159

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fixed issue on multi select field while selecting single item #159

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0a1b464
fixed issue on multi select field while selecting single item
parthjoshi90 Jan 18, 2024
4062c67
changed the condition to make existing test cases passed
parthjoshi90 Jan 20, 2024
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11 changes: 5 additions & 6 deletions src/python-fastui/fastui/forms.py
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Original file line number Diff line number Diff line change
Expand Up @@ -36,8 +36,7 @@ def __class_getitem__(cls, model: _t.Type[FormModel]) -> fastapi_params.Depends:
def fastui_form(model: _t.Type[FormModel]) -> fastapi_params.Depends:
async def run_fastui_form(request: fastapi.Request):
async with request.form() as form_data:
model_data = unflatten(form_data)

model_data = unflatten(model, form_data)
try:
return model.model_validate(model_data)
except pydantic.ValidationError as e:
Expand Down Expand Up @@ -173,7 +172,7 @@ class SelectSearchResponse(pydantic.BaseModel):
NestedDict: _te.TypeAlias = 'dict[str | int, NestedDict | str | list[str] | ds.UploadFile | list[ds.UploadFile]]'


def unflatten(form_data: ds.FormData) -> NestedDict:
def unflatten(model: _t.Type[FormModel], form_data: ds.FormData) -> NestedDict:
"""
Unflatten a `FormData` dict into a nested dict.

Expand All @@ -194,10 +193,10 @@ def unflatten(form_data: ds.FormData) -> NestedDict:
d[part] = {}
d = d[part]

if len(values) == 1:
d[last_key] = values[0]
else:
if (last_key in model.model_fields and _t.get_origin(model.model_fields[last_key].annotation) is list) or len(values) > 1:
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this isn't going to work for lots of other types e.g. tuple, set, frozenset.

Instead of introspecting the python type, I'd rather we iterated over the JSON Schema and worked out which fields should take multiple values that way.

With that we can also:

  • move the logic out of unflatten thus separating concerns
  • cache the result per model
  • have a more general solution as JSON Schema already simplifies many types into an array schema

Since we already have logic to flatten JSON Schema, we might be able to use that and therefore pass a simple dict[key, bool] to this method.

d[last_key] = values
else:
d[last_key] = values[0]

# this logic takes care of converting `dict[int, str]` to `list[str]`
# we recursively process each dict in `result_dict` and convert it to a list if all keys are ints
Expand Down