transactions

back/persistance/data/relations/EventRelationEstablisher.cs

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+using back.DataModels;
+using Microsoft.EntityFrameworkCore;
+
+namespace back.persistance.data.relations;
+
+public class EventRelationEstablisher: IRelationEstablisher
+{
+    public void EstablishRelation(ModelBuilder modelBuilder)
+    {
+        modelBuilder.Entity<Event>(entity =>
+        {
+            entity.HasMany(d => d.Tags).WithMany(p => p.Events)
+                .UsingEntity<Dictionary<string, object>>(
+                    "EventTag",
+                    r => r.HasOne<Tag>().WithMany()
+                        .HasForeignKey("TagId")
+                        .OnDelete(DeleteBehavior.ClientSetNull),
+                    l => l.HasOne<Event>().WithMany()
+                        .HasForeignKey("EventId")
+                        .OnDelete(DeleteBehavior.ClientSetNull),
+                    j =>
+                    {
+                        j.HasKey("EventId", "TagId");
+                        j.ToTable("EventTags");
+                    });
+        });
+    }
+}