validate
Also written: validate="many_to_one", MergeError
A safety check on `merge`. With `"many_to_one"`, many orders may share a SKU but each SKU must appear once in `products`, or the merge stops instead of quietly doubling sales.
Also written: validate="many_to_one", MergeError
A safety check on `merge`. With `"many_to_one"`, many orders may share a SKU but each SKU must appear once in `products`, or the merge stops instead of quietly doubling sales.