upserts: offer guidance when :replace_all
or :replace_all_except
produce an empty-list of fields to replace
#4623
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Offer some guidance to users when they upsert records with the
:replace_all
or:replace_all_except
options, and the resulting list of fields to update is empty.Please keep in mind that an empty list of fields to replace will produce an SQL Syntax error, as noted in elixir-ecto/ecto_sql#674, so we're proactively offering some advice to the users.