qgis-plugin
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Validation: Relations with multiple values for foregin keys
For relations (between tables) feature, it is important to have unique values in column (referenced field), which is used as a foreign key to the second table. It would be nice for plugin to detect, if this values are not unique and inform the user, it will not works well in INPUT. INPUT in case of multiple values chooses one of them.
Related #298
This should be checked for both "value relation" widget and also for relations defined at the project level.