/// <summary>
/// Deletes the items from the database.
/// </summary>
/// <param name="serviceProvider">The application service provider.</param>
/// <param name="token">The cancellation token for the task.</param>
public async Task DeleteAsync(IServiceProvider serviceProvider, CancellationToken token)
{
// Check if there weren't any valid items found.
if (Items == null)
{
// Throw an exception.
throw new TaskException("No valid items could be found with the provided data.");
}
// Get the total number of batches.
var count = Math.Ceiling((double)Items.Count() / ApplicationDbContext.BatchSize);
// Go over each batch.
for (var index = 0; index < count; index++)
{
// Check if the cancellation was requested.
if (token.IsCancellationRequested)
{
// Break.
break;
}
// Get the items in the current batch.
var batchItems = Items
.Skip(index * ApplicationDbContext.BatchSize)
.Take(ApplicationDbContext.BatchSize);
// Get the IDs of the items in the current batch.
var batchIds = batchItems.Select(item => item.Id);
// Define the list of items to get.
var databases = new List <Database>();
// Use a new scope.
using (var scope = serviceProvider.CreateScope())
{
// Use a new context instance.
using var context = scope.ServiceProvider.GetRequiredService <ApplicationDbContext>();
// Get the items with the provided IDs.
var items = context.Databases
.Where(item => batchIds.Contains(item.Id));
// Check if there were no items found.
if (items == null || !items.Any())
{
// Continue.
continue;
}
// Get the items found.
databases = items
.ToList();
}
// Get the IDs of the items.
var databaseIds = databases
.Select(item => item.Id);
// Delete the dependent entities.
await DatabaseExtensions.DeleteDependentSamplesAsync(databaseIds, serviceProvider, token);
await DatabaseExtensions.DeleteDependentDatabaseEdgeFieldsAsync(databaseIds, serviceProvider, token);
await DatabaseExtensions.DeleteDependentDatabaseNodeFieldsAsync(databaseIds, serviceProvider, token);
// Delete the related entities.
await DatabaseExtensions.DeleteRelatedEntitiesAsync <DatabaseUserInvitation>(databaseIds, serviceProvider, token);
await DatabaseExtensions.DeleteRelatedEntitiesAsync <DatabaseUser>(databaseIds, serviceProvider, token);
// Delete the items.
await IEnumerableExtensions.DeleteAsync(databases, serviceProvider, token);
}
}
