private FilterDefinition <TaskItem> BuildFilter(TaskItemsFilter filter)
{
var filterBuilder = Builders <TaskItem> .Filter;
var itemsFilter = filterBuilder.Empty;
if (filter == null)
{
return(itemsFilter);
}
if (!filter.GrammarPart.IsNullOrEmpty())
{
itemsFilter &= filterBuilder.In(x => x.GrammarPart, filter.GrammarPart);
}
if (!filter.TaskType.IsNullOrEmpty())
{
itemsFilter &= filterBuilder.In(x => x.TaskType, filter.TaskType);
}
if (!filter.SentType.IsNullOrEmpty())
{
itemsFilter &= filterBuilder.In(x => x.SentType, filter.SentType);
}
if (!filter.EnglishLevel.IsNullOrEmpty())
{
itemsFilter &= filterBuilder.In(x => x.EnglishLevel, filter.EnglishLevel);
}
return(itemsFilter);
}
public async Task <IReadOnlyList <TaskItem> > FindAllByFilters(TaskItemsFilter filter)
{
var itemsFilter = BuildFilter(filter);
return(await _collection.Find(itemsFilter).ToListAsync());
}
