Inconsistent Hash Codes in Entity Objects #9933

4 Answer(s)

• 

  0

  zony created 4 years ago

  Support Team

  Hi philwynn, Abp does not override GetHashCode().Are the HashCodes obtained by ABP v4.3 equal?

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• 

  0

  PhilWynn created 4 years ago

  I am finding that the hashcode depends on how the entity was retrieved. The following code was working fine on v4.3 and no longer works on v5.14:

   var selected = await _reportConfigurationColumnManager.GetConfigurationColumns()
                  .AsNoTracking()
                  .Where(c => c.ReportConfigurationTab.ReportConfigurationId == input.ConfigurationId)
                  .Select(c => c.EmployeeDetail)
                  .ToListAsync();
  
              var all = await _employeeDetailManager.GetAuthorizedEmployeeDetails()
                  .AsNoTracking()
                  .ToListAsync();
  
              return all.Except(selected).Select(ed => new ColumnListBoxItem
              {
                  Type = ConfigurableReportColumnType.EmployeeDetail,
                  Name = ed.TranslatedName,
                  EmployeeDetailId = ed.Id
              }).OrderBy(i => i.Name);
  

  For v5.14 I am alwasy getting the full "all" collection, as entity equality seems to have broken. If I override Equals and GetHashCode on the entity, then the code works again.

  Note, however, that overriding Equals and GetHashCode is not a viable solution for me, as I would need to do this across the board for many entities.

  Something has changed in ABP between these 2 versions to cause the entity equality to break.

  Regards

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• 

  0

  ismcagdas created 4 years ago

  Support Team

  Hi,

  This might be related to EF Core 3.x breaking change https://docs.microsoft.com/en-us/ef/core/what-is-new/ef-core-3.x/breaking-changes#no-tracking-queries-no-longer-perform-identity-resolution

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• 

  0

  PhilWynn created 4 years ago

  Hi, Yes, this seems to have been the cause. Many thanks.

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