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POBreeze: Differences between Entity Framework and NHibernate with many to many
 

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    <p>Here is the situation:</p> <ul> <li>WebApi v1</li> <li>Breeze 1.4.7</li> <li>EF 5.0/NHibernate 3.3.1</li> </ul> <p>What We want: A many to many exposed as a many to one. A client can have multiple countries and a country can have multiple clients. A ClientCountry entity has been created for that purpose.</p> <p>My mapping looks like this:</p> <p>Entity Framework:</p> <pre><code> modelBuilder.Entity&lt;Client&gt;().HasKey(p =&gt; p.Id).Property(p=&gt;p.Id).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity); modelBuilder.Entity&lt;Client&gt;().Property(p =&gt; p.Abbreviation); modelBuilder.Entity&lt;Client&gt;().Property(p =&gt; p.ClientSinceDate).IsRequired(); modelBuilder.Entity&lt;Client&gt;().Property(p =&gt; p.ClientUntilDate); modelBuilder.Entity&lt;Client&gt;().Property(p =&gt; p.Name).IsRequired(); modelBuilder.Entity&lt;Client&gt;().Property(p =&gt; p.Website); modelBuilder.Entity&lt;Client&gt;().HasMany(p =&gt; p.Contacts).WithRequired(p =&gt; p.Client).WillCascadeOnDelete(true); modelBuilder.Entity&lt;Client&gt;().HasMany(p =&gt; p.ClientCountries).WithRequired(p =&gt; p.Client).WillCascadeOnDelete(true); modelBuilder.Entity&lt;Contact&gt;().HasKey(p =&gt; p.Id).Property(p =&gt; p.Id).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity); modelBuilder.Entity&lt;Contact&gt;().Property(p =&gt; p.Username); modelBuilder.Entity&lt;Contact&gt;().HasRequired(p =&gt; p.Client); modelBuilder.Entity&lt;Country&gt;().HasKey(p =&gt; p.Id).Property(p =&gt; p.Id).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity); modelBuilder.Entity&lt;Country&gt;().Property(p =&gt; p.ValidFrom); modelBuilder.Entity&lt;Country&gt;().Property(p =&gt; p.ValidTo); modelBuilder.Entity&lt;Country&gt;().Property(p =&gt; p.Code); modelBuilder.Entity&lt;Country&gt;().Property(p =&gt; p.DefaultLabel); modelBuilder.Entity&lt;Country&gt;().Property(p =&gt; p.Description); modelBuilder.Entity&lt;Country&gt;().Property(p =&gt; p.DisplayOrder); modelBuilder.Entity&lt;ClientCountry&gt;().HasKey(p =&gt; p.Id).Property(p =&gt; p.Id).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity); modelBuilder.Entity&lt;ClientCountry&gt;().Property(p =&gt; p.ValidFrom); modelBuilder.Entity&lt;ClientCountry&gt;().Property(p =&gt; p.ValidTo); modelBuilder.Entity&lt;ClientCountry&gt;().HasRequired(p =&gt; p.Client); modelBuilder.Entity&lt;ClientCountry&gt;().HasRequired(p =&gt; p.Country); </code></pre> <p>NHibernate:</p> <pre><code>public class BaseMapping&lt;T&gt; : ClassMapping&lt;T&gt; where T : BaseEntity { public BaseMapping() { this.Lazy(true); Id(x =&gt; x.Id, map =&gt; { map.Generator(Generators.GuidComb); }); } } public class ClientMap : BaseMapping&lt;Client&gt; { public ClientMap() { this.Property(x =&gt; x.Name); this.Property(x =&gt; x.Abbreviation); this.Property(x =&gt; x.ClientSinceDate, map =&gt; map.NotNullable(true)); this.Property(x =&gt; x.ClientUntilDate); this.Property(x =&gt; x.City); this.Property(x =&gt; x.Website); this.Bag&lt;Department&gt;(x =&gt; x.Departments, colmap =&gt; { colmap.Key(x =&gt; x.Column("ClientId")); colmap.Inverse(true); colmap.Cascade(Cascade.All | Cascade.DeleteOrphans); }, map =&gt; { map.OneToMany(); }); this.Bag&lt;ClientCountry&gt;(x =&gt; x.ClientCountries, colmap =&gt; { colmap.Cascade(Cascade.All | Cascade.DeleteOrphans); colmap.Key(p =&gt; p.Column("ClientId")); colmap.Inverse(true); }, map =&gt; { map.OneToMany(); }); this.Bag&lt;Contact&gt;(x =&gt; x.Contacts, colmap =&gt; { colmap.Key(x =&gt; x.Column("ClientId")); colmap.Cascade(Cascade.All | Cascade.DeleteOrphans); }, map =&gt; { map.OneToMany(); }); } } public class CountryMap : BusinessRefEntityMapping&lt;Country&gt; { public CountryMap() { Bag&lt;ClientCountry&gt;(x =&gt; x.ClientCountries, colmap =&gt; { colmap.Cascade(Cascade.All); colmap.Key(p =&gt; p.Column("CountryId")); }, map =&gt; { map.OneToMany(); }); } } public class ClientCountryMap : BaseMapping&lt;ClientCountry&gt; { public ClientCountryMap() { Property(x =&gt; x.ValidFrom); Property(x =&gt; x.ValidTo); Property(x =&gt; x.ClientId, map =&gt; { map.Column("ClientId"); map.Insert(false); map.Update(false); map.NotNullable(true); }); Property(x =&gt; x.CountryId, map =&gt; { map.Column("CountryId"); map.Insert(false); map.Update(false); map.NotNullable(true); }); ManyToOne&lt;Client&gt;(x =&gt; x.Client, map =&gt; { map.Column("ClientId"); map.Cascade(Cascade.All); map.Insert(true); map.Update(true); map.NotNullable(true); }); ManyToOne&lt;Country&gt;(x =&gt; x.Country, map =&gt; { map.Column("CountryId"); map.Cascade(Cascade.All); map.Insert(true); map.Update(true); map.NotNullable(true); }); } } </code></pre> <p>The js code:</p> <pre><code> $scope.create = function (index) { var c = $scope.clients[index]; var newClientCountry = breezeService.manager.createEntity('ClientCountry', { ValidFrom: Date(2013, 01, 01), ValidTo: Date(2015, 01, 01), Client: c, Country: country, }); breezeService.manager.saveChanges() .then(function (data) { $log.info('client created'); }) .fail(function (dat) { $log.error('save client failed:' + data) }) } </code></pre> <p>The issue: With NHibernate, saving a clientcountry results in this error message :"not-null property references a null or transient value CdT.EAI.DAL.ClientCountry.Country". With EF, all works as expected. </p> <p>Is there something wrong with my code? </p>
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