MongoDB: Streamlined search across various collections

Searching for a way to enhance my case-insensitive search method across five different collections, specifically targeting the title field. I am also looking to retrieve partial results with at least three characters.

For Example:

// Collection 1
{ title: 'Sample' },
{ title: 'Another sample' }
{ title: 'This is an example' }

// Collection 2
{ title: 'Something else' },
{ title: 'A sample document' }
{ title: 'This is another example' }
  1. Ample: All documents except the first one of the second collection
  2. Sample: The first two documents of collection 1 and the second document of collection 2
  3. another: Second document of collection 1
  4. is: Should not give any result (less than 3 characters)

I have been using the following method:

db.collection.find({ title: new RegExp(value, 'i') }).fetch()

...for each collection and then combining the results into one array. However, this approach seems suboptimal as it involves searching all documents in the database.

Considering fulltext search, I added an index to the title field and experimented with this query:

db.collection.find({ $text: { $search: value } }).count()

Unfortunately, using Samp does not return the first document as expected.

Lastly, I am unsure how to execute a search across all five collections to consolidate all matches into a single result.

Answer №1

The MongoDB guides provide the following information:

When conducting case sensitive regular expression queries and an index exists for the field, MongoDB will compare the regular expression to the values in the index. This can be faster than scanning the entire collection. If the regular expression is a "prefix expression," where all potential matches start with the same string, MongoDB can optimize the search by creating a range from that prefix and only matching values within that range.

A regular expression is deemed a "prefix expression" if it commences with a caret (^) or a left anchor (\A), followed by a series of simple symbols. For instance, /^abc.*/ will be optimized by matching solely against index values that begin with abc.

This point is crucial to note:

For case insensitive regular expression queries, utilizing indexes effectively proves challenging.

In your specific scenario, using the $regex keyword along with .* in the value variable is advisable.

db.collection.find({ $text: { $regex: value, options: 'i' } }).count()

As for your last query - there seems to be no alternative but to perform a find operation on each collection, iterate through the results using .forEach, and add them to the same array/object.

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