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Breez Create Complex Entities


Breez Create Complex Entities

By : Daniel Brandt
Date : November 20 2020, 01:01 AM
I wish this help you What you are calling a complex entity, Breeze thinks of as two related entities: Employee and Person. As Wayne and Jeremy noted, you need to create each of them.
But there is something else: Breeze manages the relationship between the entities using their foreign keys. You need to have identifiers for each of your entities, and the foreign key relationships to them. Then your entities would look something like this:
code :
public class Person
{
    public int PersonId { get; set; }
    public string FirstName { get; set; } 
}

public class Employee
{
    public int EmployeeId { get; set; }
    public string EmployeePhoto { get; set; }
    public virtual Person Person { get; set; } 

    [ForeignKey("Person")]
    public virtual int PersonId { get; set; } // relates Employee to Person
}
var employee = manager.createEntity('Employee');
var person = manager.createEntity('Person');
employee.person = person;
var person = manager.createEntity('Person');
var employee = manager.createEntity('Employee', { person: person });
var person = manager.createEntity('Person');
var employee = manager.createEntity('Employee', { personId: person.personId });


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I need to create a complex relationship between two code-first entities but I'm having a hard time wrapping my brain aro

I need to create a complex relationship between two code-first entities but I'm having a hard time wrapping my brain aro


By : Sachin Watane
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , I have two entities and these two entities have two different relationships between one another. The first relationship is a one to many relationship and the second relationship is a many to many relationship. See the entities below. , Try this:
User
code :
public class User
{
   public int Id { get; set; }
   ublic string Password { get; set; }
   public string Name { get; set; }

   // Collection that represent this user's attached social providers.
   public virtual ICollection<SocialProvider> SocialProviders { get; set; }

   // Collection representing this user's friends from her attached social providers.
   public virtual ICollection<SocialProvider> SocialContacts { get; set; }
}
public class SocialProvider
{
   public int Id { get; set; }        

   public string AccessToken { get; set; }       

   [ForeignKey("Provider"), DatabaseGenerated(DatabaseGeneratedOption.None)]
   public string ProviderId { get; set; }

   public Provider Provider { get; set; }

   [ForeignKey("User"), DatabaseGenerated(DatabaseGeneratedOption.None)]
   public string UserId { get; set; }

   // The user that this SocialProvider belongs to.
   public virtual User User { get; set; }

   // The users that have this social provider as a contact.
   public virtual ICollection<User> Contacts { get; set; }
}
protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Entity<User>()
          .HasMany<SocialProvider>(r => r.SocialContacts)
          .WithMany(u => u.Contacts)
          .Map(m =>
          {
              m.ToTable("UsersInSocialContacts");
              m.MapLeftKey("UserId");
              m.MapRightKey("ProviderId");//If not ProviderId  try Id
          });
    }
breeze - error Converting circular structure to JSON at Object.stringify (native) when altering sql view called by breez

breeze - error Converting circular structure to JSON at Object.stringify (native) when altering sql view called by breez


By : Sidharth
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , ng-repeat needs to have unique value. if i would change my entity framework mapping to a different key that's not unique, that would also fix this, but then i end up with different logic issues. I could also fix it by adding track by $index to the ng-repeat, but that also doesn't capture the data correctly and ultimately causes logic issues for me. In short, angularjs is correct to demand uniqueness for ng-repeat.
How can I create a view connecting two tables show which entities in one table are not connected to entities from the ot

How can I create a view connecting two tables show which entities in one table are not connected to entities from the ot


By : user2497217
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further I need to create a view of persons and contracts that they have not yet subscribed to. So far I've come up with a nested select to collect the foreign keys in my Subscription table, but I'm stuck with how to use this information to get contracts a person doesn't have. , Here's a cross join and not exists solution:
code :
SELECT p.Id as pId, c.ID as cId
from dbo.Person as p
cross join dbo.Contract as c
WHERE p.Id IN (SELECT PersonId FROM dbo.Subscription as s1)
and not exists(select 1 from dbo.Subscription as s2 where s2.PersonId = p.Id and s2.ContractID = c.Id)
Is it possible to use spark to process complex entities with complex dependencies?

Is it possible to use spark to process complex entities with complex dependencies?


By : Gaby
Date : March 29 2020, 07:55 AM
With these it helps I don't understand enough what you mean by "complex interdependencies" but it seems that if you only need sharding you won't really get much from spark - just run multiple whatever you have an use a queue to synchronize the work and distribute to each copy the shard it needs to work on.
We did something similar converting a pySpark jot to a Kubernetes setup where the queue holds the list of ids and then we have multiple pods (we control the scale via kubectl) that read from that queue and got much better performance and simpler solution - see https://kubernetes.io/docs/tasks/job/coarse-parallel-processing-work-queue/
Left outer join in Linq To Entities (The entity or complex type cannot be constructed in a LINQ to Entities query.)

Left outer join in Linq To Entities (The entity or complex type cannot be constructed in a LINQ to Entities query.)


By : minhtamgc
Date : March 29 2020, 07:55 AM
To fix this issue You cannot project the result to a mapped entity, either you could project it to a annonymous type or create your own Ticket type something like:
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