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npgsql / efcore.pg

Entity Framework Core provider for PostgreSQL

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JsonPolymorphic support

onionhammer opened this issue · comments

commented

Normal serialization/deserialization works with jsonpolymorphic, but as soon as it's saved up to the database, the property order is not preserved, and deserialization fails back from the database.

Using: .NET 8, EF Core 8, Npgsql

Using HasColumnType("jsonb") since mapping arrays is not supported with ToJson()

commented

When using HasColumnType("jsonb"), EF isn't responsible in any way for how JSON gets serialized - that's delegated to System.Text.Json. In any case, the property order not being preserved is the document, by-design PostgreSQL behavior for jsonb (property order in JSON is generally not meaningful). Specifically for polymorphic deserialization support, npgsql/npgsql#5166 already discussed this at the Npgsql level, and the issue was in any case with System.Text.Json itself requiring that $type be the first property; that has been solved for 8.0.