entity framework decimal precision - 0.0010 persisted as 0.0000 - entity-framework

Question

i have a code-first project where one of the POCOs contains a decimal field which is being setup in the database as this:
rate = c.Decimal(nullable: false, precision: 18, scale: 4),
i can see in the SQL database it reflecting correct precision and scale. i need it to store scale of up to 4 digits, i.e. anything bigger than 0.0001 - however, what is happening when persisting values is - everything beyond first two digits of the scale is persisted as 0. i.e. - 0.0100 would be persisted as 0.0100 however - 0.0090, 0.0050 or 0.0010 would all be persisted as 0.0000. i am probably overlooking some obvious aspect here but i have been looking for any documentation reference and don't seem to be finding anything so far, i'd appreciate any clues on this. thank you!

Answer 1

i have found the answer here and it seems to have helped me resolve the issue. Sam talks exactly the same symptoms i was facing. re-doing steps Sam recommended seem to have resolve the issue. here is the link:
[Sam's article on the issue][1]https://storiknow.com/entity-framework-decimal-scale-and-precision-convention/
having implemented steps in Sam's article, it caused a side issue with the context creation, and i had the following errors pop-up as exception during migration add:
DatabaseAccess.databaseContext.ApplicationUserRole: : EntityType 'ApplicationUserRole' has no key defined. Define the key for this EntityType.
DatabaseAccess.databaseContext.ApplicationUserLogin: : EntityType 'ApplicationUserLogin' has no key defined. Define the key for this EntityType.
which in my case was solved by adding the following lines to OnModelCreating():
modelBuilder.Entity<ApplicationUserRole>().ToTable("AspNetUserRoles").HasKey(ur => new { ur.RoleId, ur.UserId });
modelBuilder.Entity<ApplicationUserLogin>().ToTable("AspNetUserLogins").HasKey<int>(ul => ul.UserId);
here, the overall OnModelCreating() definition:
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Conventions.Add(new decimalPrecisionAttributeConvention());
modelBuilder.Entity<ApplicationUserRole>().ToTable("AspNetUserRoles").HasKey(ur => new { ur.RoleId, ur.UserId });
modelBuilder.Entity<ApplicationUserLogin>().ToTable("AspNetUserLogins").HasKey<int>(ul => ul.UserId);
}
Just in case someone stumbles against the same issue.