Cycling problem

Atilla Rüstəmli 40

Hi, I have 2 entity which have one to many relation between. Lets name them School and student. When I'm creating School I'm getting cycling problem . I did all the configuration in Configure class but nothing worked. There is a way with [JsonIgnore] but I don't think it is the best way of it.

2 answers

Michael Taylor 53,971 Reputation points

2024-07-16T19:39:26.0166667+00:00

This isn't clear to me. You have a circular dependency issue? What do you mean by cycling problem? Are you getting an error, if so then provide us the error?

Also provide us sample code to see what you are talking about. At a minimum show us your POCOs that are causing the issue + any entity configurations you're using to map the POCOs to the database. In general the problem is caused by defining relationships on both sets of entities. You should define relationships on only 1 of the entities. EF will handle the bidirectional nature of the relationships.
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Michael Taylor 53,971 Reputation points

2024-07-18T02:26:12.48+00:00

Please provide us the actual exception message along with the callstack. This will pretty quickly identify the actual issue rather than us guessing. It's really just wasting time until you do. Also provide us the code that is actually causing the issue.

My gut instinct is that the issue is with your Automapper stuff. If it fails mapping back from JSON (which has nothing to do with automapper or EF) then that indicates a problem with your model but I don't think that's it. Giving us the information requested will very quickly narrow that down.
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SurferOnWww 2,661 Reputation points

2024-07-17T00:36:24.5266667+00:00

There is a way with [JsonIgnore] but I don't think it is the best way of it.

I understand that the "Cycling problem" means circular references problem due to navigation property and you are looking for other solution than using [JsonIgnore] attribute.

Please consider using a data transfer object (DTO). For details see the following Microsoft document:

Create Data Transfer Objects (DTOs)
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Atilla Rüstəmli 40 Reputation points

2024-07-17T16:18:29.39+00:00

Hi, thanks for answer.

Actually, I'm using DTO. After receiving request that contains data, I'm mapping data from my DTO's object to my Entity's object with AutoMapper and after that I'm adding data to my database. But I'm getting cycling problem(Yes, you are correct about it) and that says something like "There is might be cycling operations". I can solving it by writing [JsonIgnore] above my Entity's property but isn't seem correct to me.

SurferOnWww 2,661 Reputation points

2024-07-18T00:50:03.6333333+00:00

It seems that your issue "Cycling problem" is different from the circular references I mean which is caused when serializing .NET object of entity classes to JSON string due to navigation property.

Can you show a minimum code to reproduce your issue?

SurferOnWww 2,661 Reputation points

2024-07-18T02:36:24.5633333+00:00

The circular references I mean will result in the following exception when the serializer of the System.Text.Json namespace is used:

"Unhandled exception. System.Text.Json.JsonException: A possible object cycle was detected. This can either be due to a cycle or if the object depth is larger than the maximum allowed depth of 64. Consider using ReferenceHandler.Preserve on JsonSerializerOptions to support cycles."

How about your case?
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Cycling problem

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