How does it handle cross-field validation?

It implements cross-field comparisons using field rules like V.ge_field or V.le_field, and uses __validation_rules__ for more complex invariants.

Does this skill replace manual update checks?

It is designed to migrate manual before_update validation checks into the declarative validation system, reserving manual checks only for normalization or non-ruleable invariants.

Does this skill handle documentation updates?

Yes, it specifically manages Google-style 'Raises' sections in property docstrings to ensure they accurately reflect the validation logic being enforced.

When should I use the flet-validation skill?

Use this skill when adding or modifying validation for Python controls in the Flet SDK, specifically when working with Annotated rules, __validation_rules__, or property docstrings.

Flet Control Validation

Name: Flet Control Validation
Author: flet-dev

byflet-dev

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16,009

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Mobile Development

Automates the implementation and documentation of Python-side control validation for Flet applications.

This skill provides specialized guidance for Flet developers to implement robust validation logic for Python controls using the V-rule validation API. It ensures that data validation is consistent across the Python SDK and the underlying Dart-based Flet engine, automating the creation of Google-style 'Raises' docstrings and aligning cross-field invariants to prevent runtime errors before they cross the bridge to the UI layer.

Key Features

0116,009 GitHub stars

02Synchronization of Python constraints with Dart/Flutter behavior

03Cross-field invariant management via __validation_rules__

04Declarative field validation using Annotated types and V rules

05Automated Google-style property docstring generation for validation errors

06Migration support for moving manual checks to the validation API

Use Cases

01Migrating legacy manual before_update checks to modern declarative rules

02Adding range or value constraints to new Flet control properties

03Aligning Python-side validation with effective Dart defaults and assertions

Key Features

0116,009 GitHub stars

02Synchronization of Python constraints with Dart/Flutter behavior

03Cross-field invariant management via __validation_rules__

04Declarative field validation using Annotated types and V rules

05Automated Google-style property docstring generation for validation errors

06Migration support for moving manual checks to the validation API

Use Cases

01Migrating legacy manual before_update checks to modern declarative rules

02Adding range or value constraints to new Flet control properties

03Aligning Python-side validation with effective Dart defaults and assertions