How Can Raw SQL Queries Enhance Rails Application Performance?

Use native SQL to optimize Rails application data retrieval efficiency

When encountering performance bottlenecks in deployment environments such as Heroku, consider optimizing your Rails application using native SQL queries, which can significantly increase speed and reduce request timeouts.

Let’s see how to convert the following Rails code into a native SQL query:

@payments = PaymentDetail.joins(:project).order('payment_details.created_at desc')
@payment_errors = PaymentError.joins(:project).order('payment_errors.created_at desc')

@all_payments = (@payments + @payment_errors)

To execute this query using native SQL, please follow these steps:

# 编写原生SQL查询
sql = "SELECT * FROM payment_details
JOIN projects ON payment_details.project_id = projects.id
UNION
SELECT * FROM payment_errors
JOIN projects ON payment_errors.project_id = projects.id
ORDER BY created_at DESC;"

# 直接在数据库上执行SQL查询
records_array = ActiveRecord::Base.connection.execute(sql)

Results records_array will be an array containing the results of the SQL query. You can iterate over these records for further processing. This approach bypasses the ActiveRecord ORM layer, potentially resulting in significant performance gains.

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