April 2020
Beginner to intermediate
540 pages
14h 14m
Russian
Content preview from MongoDB: полное руководство
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$unwind 213
ваясь на нашем обзоре примера с документом Facebook, мы знаем, что все
спонсоры перечислены в массиве под названием
"investments". Наш этап
указывает, что мы хотим спроецировать значение nancial_org.permalink
для каждой записи в массиве "investments", для каждого раунда финанси-
рования. Таким образом, создается массив, состоящий из массивов имен
спонсоров.
В последующих разделах мы рассмотрим, как выполнять арифметиче-
ские и другие операции со строками, датами и рядом других типов значе-
ний для проецирования документов всех форм и размеров. Практически
единственное, чего мы не можем сделать в этом этапе, – это изменить тип ...
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