api-platform-integer-backed-enum

This repository demonstrates a bug in API Platform where the built-in BackedEnumFilter does not support integer-backed enums.

It includes a minimal Symfony application pre-configured to showcase both the broken behavior and a custom workaround that resolves the issue.

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🏁 Getting Started

Start the Symfony server:

symfony serve

Once running, access the API docs at:

📘 https://127.0.0.1:8000/api

The SQLite database (var/data_dev.db) is pre-populated with dummy objects for testing.

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🐛 The Bug

• Visit the DummyUsingCurrentFilter resource.

• Try filtering using the dummyIntBackedEnum property.

• You'll see that filtering does not work.

• Symfony logs a warning:

  Invalid filter ignored.
  

This is because the default BackedEnumFilter does not properly handle enums backed by integers.

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✅ The Fix

• The DummyUsingUpdatedFilter resource uses a custom BackedEnumFilter and BackedEnumFilterTrait located in src/ApiFilter.
• This custom implementation properly handles integer-backed enums.
• Filtering now works as expected.

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🗂️ Contents

• src/Entity/ – Demo entities
• src/ApiFilter/ – Custom filter and trait for enum support
• var/data_dev.db – Pre-filled SQLite DB for quick testing