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Learning Mongoid

You're reading from   Learning Mongoid If you know MongoDB and Ruby, then Mongoid is a very handy tool to have at your disposal. Quickly learn to build Rails applications with the helpful code samples and instructions in this book.

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Product type Paperback
Published in Dec 2013
Publisher Packt
ISBN-13 9781782167501
Length 140 pages
Edition 1st Edition
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Author (1):
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Gautam Rege Gautam Rege
Author Profile Icon Gautam Rege
Gautam Rege
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Toc

Query selectors


The following is a list of all supported methods that are supported on any Mongoid class. The following table states the attributes of the query selectors, their usage, and description:

:all

Book.all(reviews: ['good', 'excellent'])

This finds all the documents where the field (typically an array) matches all the values in the array. So, this means that reviews is an array inside the Book document, and it must contain at least two values good and excellent.

In case reviews is an embedded document, we can also write this like the following code:

Book.all("reviews.content" => ['good', 'excellent'])

:exists

Author.exists(books_count: true)

This finds all the documents in which the field exists.

:gt/:gte/:lt/:lte

Author.gt(books_count: 1)

Author.lte(books_count: 10)

This finds all the documents in which count is greater than (:gt) or greater than or equal to (:gte) and lesser than (:lt) and lesser than or equal to (:lte).

:in

:nin

Author.in(name: ['Gautam', 'Charles...

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