feat: Add backward-compatible fetch() with deprecation warning #1355
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Restore fetch() method for easier migration from DataJoint 0.14.
The method emits a DeprecationWarning and maps to 2.0 methods:
- fetch() → to_arrays()
- fetch(as_dict=True) → to_dicts()
- fetch('col1', 'col2') → proj(...).to_dicts()
- fetch('col1', 'col2', as_dict=False) → to_arrays('col1', 'col2')
- fetch(format='frame') → to_pandas()
Supports order_by, limit, offset, squeeze parameters.
Updates migration guide link to new location.
Bump version to 2.0.0a27.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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esutlie
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Jan 28, 2026
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Summary
Restores the
fetch()method for easier migration from DataJoint 0.14. Emits a deprecation warning and delegates to 2.0 output methods.Motivation
Production pipelines have 100+
fetch()calls deeply integrated with downstream logic. Requiring immediate rewrites creates migration barriers and version lock-in risk.This allows gradual migration: code works immediately on 2.0, deprecation warnings guide incremental updates.
Changes
1. Backward-compatible
fetch()Emits
DeprecationWarningand maps to 2.0 methods:fetch()to_arrays()fetch(as_dict=True)to_dicts()fetch('col1', 'col2')proj('col1', 'col2').to_dicts()fetch('col1', 'col2', as_dict=False)to_arrays('col1', 'col2')fetch(format='frame')to_pandas()Supports
order_by,limit,offset, andsqueezeparameters.2. Unit tests
Added 9 unit tests covering all fetch() patterns and parameter passthrough.
3. Fix migration guide link
Updated
migrate-from-0x→migrate-to-v204. Version bump
2.0.0a26 → 2.0.0a27
Testing
All unit tests pass.
Related
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