private static async Task <TEntity> GetOrCreateEntityAsync <TEntity>(NesteoDbContext dbContext, Expression <Func <TEntity, bool> > predicate,
Func <TEntity> factoryFunc) where TEntity : class
{
// Get db set
DbSet <TEntity> dbSet = dbContext.Set <TEntity>();
// If the entity exists in the local snapshot, return it directly
TEntity entity = dbSet.Local.FirstOrDefault(predicate.Compile());
if (entity != null)
{
return(entity);
}
// Search the entity in the database
entity = await dbSet.FirstOrDefaultAsync(predicate).ConfigureAwait(false);
if (entity != null)
{
return(entity);
}
// Entity doesn't exist yet. Create a new one
entity = factoryFunc.Invoke();
return(dbSet.Add(entity).Entity);
}
protected CrudServiceBase(NesteoDbContext dbContext, IMapper mapper)
{
DbContext = dbContext ?? throw new ArgumentNullException(nameof(dbContext));
Mapper = mapper ?? throw new ArgumentNullException(nameof(mapper));
Entities = dbContext.Set <TEntity>();
}