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fix(report): add helpful migration errors for save_html/save_json/json in 0.7+#1850

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RaghavShah01 wants to merge 1 commit intoevidentlyai:mainfrom
RaghavShah01:fix/report-migration-error-messages
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fix(report): add helpful migration errors for save_html/save_json/json in 0.7+#1850
RaghavShah01 wants to merge 1 commit intoevidentlyai:mainfrom
RaghavShah01:fix/report-migration-error-messages

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@RaghavShah01 RaghavShah01 commented Mar 27, 2026

Fixes #1595

Users on Evidently 0.7+ get a cryptic error with no guidance:

AttributeError: 'Report' object has no attribute 'save_html'

Root cause: In 0.7, report.run() returns a Snapshot object.
save_html, save_json, and json() all moved onto Snapshot,
not Report.

Fix: Added 3 stub methods to the Report class that raise clear,
actionable AttributeError messages showing the correct 0.7+ pattern.

After this fix users see:

AttributeError: `save_html` is not available on the `Report` object 
in Evidently >= 0.7.

In Evidently 0.7+, `report.run()` returns a `Snapshot` object.
Call `save_html` on that snapshot instead:

    snapshot = report.run(current_data, reference_data)
    snapshot.save_html('file.html')

Migration guide: https://docs.evidentlyai.com/faq/migration

@RaghavShah01 RaghavShah01 mentioned this pull request Mar 27, 2026
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Report object has no attribute save_html function

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@RaghavShah01