[RaphaelFakhri]

Fixes #305

Why

build_query_param percent-encodes each list item with quote and httpx then encodes the query string again. Any reserved character in a list item reaches the server double-encoded: read_collections(collection_refs=["food:pizza"]) sends collection_refs=food%253Apizza, which the server decodes to food%3Apizza. Collection references always contain :, so read_collections and delete_collections never match a collection. getstream-go and stream-node encode list parameters once.

Changes

• build_query_param joins list items with commas and leaves the encoding to httpx, which encodes the query string once. The async variant calls the same function.
• test_build_query_param_with_various_types expects the unencoded joined value.
• Add a test that calls read_collections through a mock transport and asserts that the server sees the original references.

Testing

• Without the change, uv run pytest tests/test_query_params.py tests/test_decoding.py gives 2 failed, 28 passed ('food%3Apizza,user%40example.com,a%20b' != 'food:pizza,user@example.com,a b').
• With the change, the same command gives 30 passed, and make test gives 482 passed.

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Note

Medium Risk
Changes shared query serialization for every list query param across the client; behavior fix is intentional but could affect any API that relied on the old double-encoded form.

Overview
Fixes double URL-encoding for list-valued query parameters built by build_query_param (and the async wrapper).

List items are now joined with commas without per-item quote(); httpx performs a single encoding when the request is sent. That restores correct values for refs containing :, @, or spaces (e.g. read_collections / delete_collections collection_refs).

Tests now expect the raw joined string in unit tests and add an integration-style check via mock transport that collection_refs reaches the URL as food:pizza,user@example.com,a b.

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Summary by CodeRabbit

• Bug Fixes
  • Corrected how list-valued query parameters are formatted. Values are now joined with commas before request encoding, preserving commas and spaces within individual values and ensuring collection references are passed as expected.
• Documentation
  • Clarified that list values are comma-separated without per-value URL encoding.

[coderabbitai]

📝 Walkthrough

Walkthrough

List query values are now joined with commas without per-item URL encoding. Updated tests check preserved characters in serialized values and the parsed collection_refs parameter in a collections request.

Changes

List query serialization

Layer / File(s)	Summary
List query serialization and tests getstream/utils/__init__.py, tests/test_decoding.py, tests/test_query_params.py	build_query_param joins serialized list values without URL-encoding each item. Its documentation and the async builder’s documentation describe comma-separated values without URL encoding. Tests check literal commas and spaces in list values and verify that feeds.read_collections sends comma-joined collection_refs.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix · Severity of issue fixed: Medium

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Merge Risk: 🔵 Low · up to 839ae

If comma-bearing strings are valid list items, requests cannot distinguish them from multiple entries. The endpoint restrictions remain unclear, so clarify them or avoid relying on those inputs.

Pre-merge checks | 4 | 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 33.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 6 functions across 3 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the main change: preventing double encoding of list query parameters.
Linked Issues check		The PR meets the coding requirements in [#305]. build_query_param now joins list items without per-item percent-encoding. build_query_param_async delegates to the same implementation. The updated …
Out of Scope Changes check		The changes stay within [#305]. The source change updates shared list query serialization, and the test changes verify the serializer and the affected read_collections request. No unrelated product …

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Actionable comments posted: 1

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Inline comments:
Review comments at @getstream/utils/__init__.py:
- Line 134: Update the list serialization in build_query_param to encode commas
within each item before joining items with literal separators, avoiding
double-encoding values; add a test confirming ["a,b", "c"] remains distinct from
["a", "b", "c"].

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ℹ️ Review info

⚙️ Run configuration

• Configuration used: defaults
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• Run ID: 43e59f83-8e31-420e-8e37-f613cea0ba89

📥 Commits

Reviewing files that changed from the base of the PR and between f0f1da5 and 839ae71.

📒 Files selected for processing (3)

• getstream/utils/__init__.py
• tests/test_decoding.py
• tests/test_query_params.py

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