public static RepositoryResult <T> CheckCreateEntity <T, TId>(
this BaseDbContext dbAccess,
T model,
Func <T, T, bool> isDuplicate = null)
where T : BaseAuditable <TId>
{
var result = new RepositoryResult <T> {
Entity = model
};
// Check 1: model already has unique key - skip
if (!EqualityComparer <TId> .Default.Equals(model.Id, default))
{
result.ResultCode |= RepositoryResultCode.Impractical;
}
// Check 2: model does not pass validation - skip
dbAccess.ValidateEntity <T, TId>(model, result);
// Check 3: model violated UK constraint
var baseAuditables = dbAccess.Set <T>().AsEnumerable() ?? new List <T>();
if (null != isDuplicate && baseAuditables.Any(q => isDuplicate(q, model)))
{
result.ResultCode |= RepositoryResultCode.Duplicate;
}
return(result);
}
/// <summary>
/// Creates an <see cref="RepositoryResult"/> indicating a failed repository operation, with a list of <paramref name="errors"/> if applicable.
/// </summary>
/// <param name="errors">An optional array of <see cref="RepositoryResult"/>s which caused the operation to fail.</param>
/// <returns>An <see cref="RepositoryResult"/> indicating a failed repository operation, with a list of <paramref name="errors"/> if applicable.</returns>
public static RepositoryResult Failed(params RepositoryError[] errors)
{
var result = new RepositoryResult {
Succeeded = false
};
if (errors != null)
{
result._errors.AddRange(errors);
}
return(result);
}
public static void ValidateEntity <T, TId>(this BaseDbContext dbAccess, T entity, RepositoryResult <T> result)
where T : IAuditable <TId>
{
entity.CreatedAt = DateTime.UtcNow;
entity.CreatedBy = dbAccess.Requestor;
var validationContext = new ValidationContext(entity);
if (!Validator.TryValidateObject(entity, validationContext, result.ValidationResult, true))
{
result.ResultCode |= RepositoryResultCode.Invalid;
}
}