Trying to create a calculation column in a table where it returns the sum of all allocated_hours for any db row that has a matching user_id. Currently I am getting "0" in the column for each item. What am I missing here? Thanks for the help.Trying to create a calculation column in a tabl
阅读背景：
如何计算具有另一个公共值的所有模型对象的总计
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