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Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. I would like it if the PanacheMongoEntity would have its equals and hashcode methods implemented, in order to more easily compare Mongo entity objects that utilize this class. Without the methods defined by the panache entity class, it makes using lombok to simplify the code written for extending classes more difficult. I wrote my own wrapper class for PanacheMongoEntity as a stopgap, and the following seems to work: the equals implementation is pulled from a delombok, and I now realize is missing a null check on the id, but it's essentially what I would say we want. It seems like a fairly trivial thing to add to me, having not actually looked at the panache entity class. I can probably add it in if it is determined to be something we want to add. The text was updated successfully, but these errors were encountered:. If we do it, we will do it also for Hibernate with Panache This can be very surprising in some cases Sorry, something went wrong. I've never ever needed it myself because I've never had to deal with collections of unpersisted entities, or multiple instances of the same persisted entity. The problem with those users who do have 'special needs' most often will also require a customization of such equality contracts, so I'd say it's best to not generate any at all. Identity is correctly managed automatically for managed entities; it also so happens that the default identity is the most efficient. However my thoughts mostly apply to JPA entities, as they are statuful and actually triggering lazy loading is not something you want from such a method. I guess PanacheMongo might be a different context. Question: does PanacheMongo deal with de-duplication of 'same instance' in complex object graphs? Suppose you have multiple objects into some collection, it's unclear if multiple objects having id set to null are referring to 'the same' or not, and if they are 'the same', which state is the right one to be written? Also like FroMage said, it's all really a lot easier when dealing exclusively with bags of persisted entities, so that one can stop being bothered by the devilish details of getting the equality contract wrong. Sanne The answer is no. Suppose you have multiple objects into some collection, it's unclear if multiple objects having id set to null are referring to 'the same' or not, and if they are 'the same', which state is the right one to be written. Sets does not allow duplicates, but with lists you must care of that for example with something like this:. If you dont have those identifiers then the solution is to use the one described in. If PanacheEntity should simplify this then it should maybe consider to have another ID-generation plan by default. Actually, I think its Sequence to the IDs are generated by the database. If PanacheEntity provides id generation within application, for example:. So user does not need to add it manually. I strongly believe it's a recipe for disaster to work with non-persisted and non-managed entities, but sure there's various ways to use it. Basing things on Sequence like nimo23 mentions is a good idea, but it doesn't apply to all databases. Which is precisely why I believe the framework should not generate such methods, as it's important for the users to understand the implications - while the default methods are great for many use cases as they are safe. Ok so this might be less important for MongoDB. It's not clear to me what would be best in this case, I just don't want those methods generated by default for JPA :. I'd be cautious though, it doesn't seem to bring much value. Isn't it the point to allow people to use any object they want? Sanne one subjective question: The user does not need to use the database ID generation which is the default for PanacheEntity. Do you think that this is a good idea? So what would the consensus be here? Just a bump, and curious to see where this goes. If this is only about PanacheMongoEntity as the title states, I think it should be loicmathieu to decide. Sequences are commonly supported now even MysQL has them! First, a digression on UUIDs. UUID are good identifiers because they are client generated so no risk of contention on INSERT on the database as with database generated sequence and random so safer to use a sequence is predictable so a user can fetch the entire database easily. Concern about performance and entropy needs to be taken seriously if you plan to generate a lot of them. Yes, this is one of the most important things when using cliend id generation. Combining this with pooling such as the pooling which does hibernate with sequence and its allocationSize? I dont know if quarkus makes internally use of any UUID for identifying instances or the like. Only if you use sequence generators. The ID is available before database insertion time, if you use something like this:. Btw, I think the best to avoid the id-generation is to provide composite Ids based on business keys. And this can only be done by the user. In conclusion, looks like we all agree that this is an area in which one solution doesn't fit all needs. I hope you don't mind GregJohnStewart , but I'd close this. Honestly, might be great to completely abstract how the 'user domain' maps to objects, but we're not ready for it yet : Sometimes I wonder if high-producitivity frameworks like Quarkus shouldn't steer away from Java POJOs for domain representation and use some meta-description from which to generate the 'right details' based on all details we can gather; but that's probably a discussion for a different issue as there's many more such details that need to be universally solved. All good! The issue was deeper than I imagined. Not a big deal, thought I would suggest. Thanks for all your time! I know it is already closed, but I think it good to have the equals and hashcode methods on the PanacheMongoEntity, because it can be cached or worked with another feature that does not guarantee the same memory address to the same entity. Now, If we use cache and read an entity from cache, the equals and hashcode will be different to the same entity, as the memory address are different. It turns the PanacheMongoEntity to be cached as default. The PR: Such bugs are also hard to identify, while when encouraging people to implement their own, people have at least to think about what they are doing. What are you doing with such a cache? It doesn't sound sensible to use such a mutable object as a key for any map - especially not if it's a map meant to share state with other threads. For any cache usage, use an immutable identifier - the ID of the object could be a good candidate assuming it's immutable , otherwise you'll have the framework extract an immutable tuple. Skip to content. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window. You switched accounts on another tab or window. Dismiss alert. Notifications You must be signed in to change notification settings Fork 2. New issue. Sign up for GitHub. Jump to bottom. Copy link. Description I would like it if the PanacheMongoEntity would have its equals and hashcode methods implemented, in order to more easily compare Mongo entity objects that utilize this class. All reactions. FroMage commented Feb 7, Sanne commented Feb 7, MongoDB with Panache is stateless, so identity equals is less usable. Sets does not allow duplicates, but with lists you must care of that for example with something like this: OneToMany Fetch FetchMode. It's not clear to me what would be best in this case, I just don't want those methods generated by default for JPA : I'd be cautious though, it doesn't seem to bring much value. Isn't it the point to allow people to use any object they want Yes. I also think that this makes more sense. Contributor Author. GregJohnStewart commented Feb 9, Just a bump, and curious to see where this goes All reactions. Sanne commented Feb 9, Just a bump, and curious to see where this goes I don't what this applied to JPA entities, but I have no opinion regarding DTO's going into MongoDB - mainly as I have no experience with it, I can't speak about the implications in that case. Concern about performance and entropy needs to be taken seriously if you plan to generate a lot of them Yes, this is one of the most important things when using cliend id generation. Sanne commented Feb 10, GregJohnStewart commented Feb 11, GregJohnStewart closed this as completed Feb 11, Adding equals and hashcode methods to PanacheMongoEntity The PR: All reactions. FroMage mentioned this issue Mar 30, Adding equals and hashcode methods to PanacheEntity Loki-Afro commented Jan 16, Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment. But I propose to let this issue open for discussion, maybe I'm wrong :. And as the ID field is only populated at insertion time Only if you use sequence generators.

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