Filtering a Product Collection

[AleksShamles]

How to properly apply collection filtering in Magento 2? I am trying to get a collection of products with multiple conditions, but I cannot set up filters correctly. What are the best practices for using the addFieldToFilter method and what nuances should I keep in mind when filtering by multiple fields? Also, how to properly optimize queries so as not to encounter performance issues when working with large amounts of data?

[Bill Shiphr]

When applying filters to a Magento 2 collection, it's essential to use addFieldToFilter properly. To filter by multiple fields, you can chain addFieldToFilter calls, each for a different condition. Always use the appropriate conditions for each field, such as eq, like, or in, depending on the filter you need. Avoid using LIKE on large datasets as it can cause performance issues. To further optimize, consider using custom SQL with select() for more complex queries. This will help in avoiding unnecessary joins and improve query performance when working with large amounts of data. Proper indexing is also crucial to maintaining efficient filtering. Make sure your database is optimized to prevent slowdowns when fetching large collections. For more insights on efficient filtering, consult resources like magento 2 collection filter guides.