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---
title: Instrumentation
layout: guide
doc_stub: false
search: true
section: Queries
desc: Wrap query execution with custom logic
---
You can call hooks _before_ and _after_ each query. Query instrumentation can be attached during schema definition:
```ruby
class MySchema < GraphQL::Schema
instrument(:query, QueryTimerInstrumentation)
end
```
The instrumenter must implement `#before_query(query)` and `#after_query(query)`. The return values of these methods are not used. They receive the {{ "GraphQL::Query" | api_doc }} instance.
```ruby
module QueryTimerInstrumentation
module_function
# Log the time of the query
def before_query(query)
Rails.logger.info("Query begin: #{Time.now.to_i}")
end
def after_query(query)
Rails.logger.info("Query end: #{Time.now.to_i}")
end
end
```
|
