实现了创建空间和加入空间
调试接口的时候报:
failed to lazily initialize a collection of role: com.heslin.postopia.model.User.spaces: could not initialize proxy - no Session
检查之后发现 UsernamePasswordAuthenticationToken 在处理过程中会调用principal 的 toString方法,导致了这个错误,自己重载User.toString 之后恢复正常。
Polymorphic Query
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Java Enum
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Pageable and Sort
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@Query and JPQL
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