Cherry pick fix for panic reflect.Value.Interface on zero value
#397
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PROBLEM ======= In HTTP API services, a user may specify a `_filter=` specifying a field name and an empty string (`field == ""`). The `ToORM()` codec translates the empty string to a `nil` pointer. `ProcessStringCondition()` then attempts to take a `reflect.Value.Interface` on this nil pointer, causing a panic. SOLUTION ======== Detect the nil pointer value, and return a nil value. The gorm codec translates this to a `NULL` value in SQL syntax. This resolves the panic, but results in an SQL query that matches no rows (`field == NULL`). DISCUSSION ========== It's arguable what the user intent is here, considering that there is existing Atlas filter syntax for `field == null` (resulting in the correct identity SQL expression `field IS NULL`). The explicit empty string value cannot exist in our interpretation because the codec translates it to NULL reliably; a user that POSTs an object with a string field set `""` will result in a table row set to NULL. But we might want to consider that `field == ""` should be an alias for the NULL identity expression; the user intent is probably to find rows where the field is `""` in their experience of the object. From one point of view, it is correct that there are never any rows in our table with fields of `""` value. From another point of view, there are rows in our table with fields not equal to `""` value and that query should have results (the `field != ""` syntax seems like it should work).
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please rebuild |
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oh that is probably the golang version difference |
daniel-garcia
approved these changes
Jan 9, 2024
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This PR is a cherry-pick of PR #396 to the
v0.25branch:There were no conflicts to resolve.