Relatively new to rails and trying to model a very simple family "tree" with a single Person model that has a name, gender, father_id and mother_id (2 parents). Below is basically what I want to do, but obviously I can't repeat the :children in a has_many (the first gets overwritten).Relatively new to rails and trying to model a v
阅读背景：
Rails模型有许多具有多个foreign_key
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