Add JSON function to models

DataAccess/EF_Demo/Data/DbJson.cs

@@ -0,0 +1,7 @@
+namespace EF_Demo.Data;
+
+internal static class DbJson
+{
+  public static string? JsonValue(string? expression, string path)
+    => throw new NotSupportedException();
+}

DataAccess/EF_Demo/Data/MSSQL/EventsContext.Custom.cs

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+using Microsoft.EntityFrameworkCore;
+
+namespace EF_Demo.Data.MSSQL;
+
+public partial class EventsContext
+{
+  partial void OnModelCreatingPartial(ModelBuilder modelBuilder)
+  {
+    modelBuilder
+      .HasDbFunction(typeof(DbJson).GetMethod(nameof(DbJson.JsonValue))!)
+      .HasName("JSON_VALUE")
+      .IsBuiltIn();
+  }
+}

DataAccess/EF_Demo/Data/Postgres/EventsContext.Custom.cs

@@ -0,0 +1,14 @@
+using Microsoft.EntityFrameworkCore;
+
+namespace EF_Demo.Data.Postgres;
+
+public partial class EventsContext
+{
+  partial void OnModelCreatingPartial(ModelBuilder modelBuilder)
+  {
+    modelBuilder
+      .HasDbFunction(typeof(DbJson).GetMethod(nameof(DbJson.JsonValue))!)
+      .HasName("jsonb_extract_path_text")
+      .IsBuiltIn();
+  }
+}