Solution
some answerd on laracasts:
pmall:
So category_id is a string and id an integer? The two column must have exactly the same definition, so they must be the same type. Why would you ever want to have a PK as int and a FK as string?
BartHuis:
aaaah, maybe that was wrong, i was initialy setting everything as string, just to test things, but i don't know for sure if both sides were a string at that time, i just re written the case here. but as you mention, both sides must be the same, so i thing only one of the sites were string and the other int... thanks, will try it later...
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