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记录之间有层级结构，客户希望在form里也能看到这种层级结构
默认的不可以, 但社区里记得以前有人玩.如果有JS能力. 应该可以做个 one2many_tree widget
记得知识管理模块里面有树形结构视图，如果form里面也要有，可以借鉴试试。期待大牛解决
