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我使用'ancestry' gem 渲染了树视图,它工作正常。如何获得像 jquery-treeview 这样的树折叠/展开功能?
我有一个表,其中有一列名为itemCount,我想选择前 n 行,而SUM(itemCount)小于y.
itemCount
SUM(itemCount)
y
+----+-----------+ | id | itemCount | +----+-----------+ | 1 | 5 | | 2 | 10 | |