Add more form constraints

demo/forms.py

@@ -141,7 +141,10 @@ class SizeModel(BaseModel):
 
 class BigModel(BaseModel):
     name: str | None = Field(
-        None, description='This field is not required, it must start with a capital letter if provided'
+        None,
+        max_length=10,
+        min_length=2,
+        description='This field is not required, it must start with a capital letter if provided, and have length 2-10',
     )
     info: Annotated[str | None, Textarea(rows=5)] = Field(None, description='Optional free text information about you.')
     profile_pic: Annotated[UploadFile, FormFile(accept='image/*', max_size=16_000)] = Field(
@@ -154,6 +157,9 @@ class BigModel(BaseModel):
     human: bool | None = Field(
         None, title='Is human', description='Are you human?', json_schema_extra={'mode': 'switch'}
     )
+    number: int | None = Field(
+        None, title='Number', ge=0, le=10, multiple_of=2, description='This is a number should be 0-10 and step with 2'
+    )
     size: SizeModel
 
     position: tuple[

src/npm-fastui/src/components/FormField.tsx

@@ -24,7 +24,8 @@ interface FormFieldInputProps extends FormFieldInput {
 }
 
 export const FormFieldInputComp: FC<FormFieldInputProps> = (props) => {
-  const { name, placeholder, required, htmlType, locked, autocomplete } = props
+  const { name, placeholder, required, htmlType, locked, autocomplete, maxLength, minLength, ge, le, multipleOf } =
+    props
 
   return (
     <div className={useClassName(props)}>
@@ -40,6 +41,11 @@ export const FormFieldInputComp: FC<FormFieldInputProps> = (props) => {
         placeholder={placeholder}
         autoComplete={autocomplete}
         aria-describedby={descId(props)}
+        maxLength={maxLength}
+        minLength={minLength}
+        min={ge}
+        max={le}
+        step={multipleOf}
       />
       <ErrorDescription {...props} />
     </div>

src/npm-fastui/src/models.d.ts

@@ -353,6 +353,13 @@ export interface FormFieldInput {
   initial?: string | number
   placeholder?: string
   autocomplete?: string
+  maxLength?: number
+  minLength?: number
+  ge?: number | number
+  le?: number | number
+  gt?: number | number
+  lt?: number | number
+  multipleOf?: number | number
   type: 'FormFieldInput'
 }
 export interface FormFieldTextarea {

src/python-fastui/fastui/components/forms.py

@@ -32,6 +32,13 @@ class FormFieldInput(BaseFormField):
     initial: _t.Union[str, float, None] = None
     placeholder: _t.Union[str, None] = None
     autocomplete: _t.Union[str, None] = None
+    max_length: _t.Union[int, None] = pydantic.Field(default=None, serialization_alias='maxLength')
+    min_length: _t.Union[int, None] = pydantic.Field(default=None, serialization_alias='minLength')
+    ge: _t.Union[int, float, None] = None
+    le: _t.Union[int, float, None] = None
+    gt: _t.Union[int, float, None] = None
+    lt: _t.Union[int, float, None] = None
+    multiple_of: _t.Union[int, float, None] = pydantic.Field(default=None, serialization_alias='multipleOf')
     type: _t.Literal['FormFieldInput'] = 'FormFieldInput'
 
 

src/python-fastui/fastui/json_schema.py

@@ -47,6 +47,8 @@ class JsonSchemaString(JsonSchemaBase):
     type: _ta.Required[_t.Literal['string']]
     default: str
     format: _t.Literal['date', 'date-time', 'time', 'email', 'uri', 'uuid', 'password']
+    maxLength: int
+    minLength: int
 
 
 class JsonSchemaStringEnum(JsonSchemaBase, total=False):
@@ -197,6 +199,13 @@ def json_schema_field_to_field(
             initial=schema.get('default'),
             autocomplete=schema.get('autocomplete'),
             description=schema.get('description'),
+            max_length=schema.get('maxLength'),
+            min_length=schema.get('minLength'),
+            ge=schema.get('minimum'),
+            le=schema.get('maximum'),
+            gt=schema.get('exclusiveMinimum'),
+            lt=schema.get('exclusiveMaximum'),
+            multiple_of=schema.get('multipleOf'),
         )
 
 

src/python-fastui/tests/test_forms.py

@@ -6,7 +6,7 @@
 from fastapi import HTTPException
 from fastui import components
 from fastui.forms import FormFile, Textarea, fastui_form
-from pydantic import BaseModel
+from pydantic import BaseModel, Field
 from starlette.datastructures import FormData, Headers, UploadFile
 from typing_extensions import Annotated
 
@@ -16,6 +16,11 @@ class SimpleForm(BaseModel):
     size: int = 4
 
 
+class FormWithConstraints(BaseModel):
+    name: str = Field(..., max_length=10, min_length=2, description='This field is required, it must have length 2-10')
+    size: int = Field(4, ge=0, le=10, multiple_of=2, description='size with range 0-10 and step with 2')
+
+
 class FakeRequest:
     """
     TODO replace this with httpx or similar maybe, perhaps this is sufficient
@@ -89,6 +94,42 @@ def test_inline_form_fields():
     }
 
 
+def test_form_with_constraints_fields():
+    m = components.ModelForm(model=FormWithConstraints, submit_url='/foobar/')
+
+    assert m.model_dump(by_alias=True, exclude_none=True) == {
+        'submitUrl': '/foobar/',
+        'method': 'POST',
+        'type': 'ModelForm',
+        'formFields': [
+            {
+                'name': 'name',
+                'title': ['Name'],
+                'required': True,
+                'locked': False,
+                'htmlType': 'text',
+                'type': 'FormFieldInput',
+                'description': 'This field is required, it must have length 2-10',
+                'maxLength': 10,
+                'minLength': 2,
+            },
+            {
+                'name': 'size',
+                'title': ['Size'],
+                'initial': 4,
+                'required': False,
+                'locked': False,
+                'htmlType': 'number',
+                'type': 'FormFieldInput',
+                'description': 'size with range 0-10 and step with 2',
+                'le': 10,
+                'ge': 0,
+                'multipleOf': 2,
+            },
+        ],
+    }
+
+
 async def test_simple_form_submit():
     form_dep = fastui_form(SimpleForm)