How can I add ruleContexts on my Search?

ruleContexts is a Search parameter that you can pass either from your back-end Search or your front-end Search.
 
back-end Search
 
You can pass this parameter when you call the search API Client method:
 

index.search('query', {
  ruleContexts: ['category-category_id-5252']
}).then(({ hits }) => {
  console.log(hits);
});

 
You can find more information about the ruleContexts API parameter in the following documentation: https://www.algolia.com/doc/api-reference/api-parameters/ruleContexts/
 
front-end Search
 
If you have a front-end Search implementation you would need to use the configure widget provided by our InstantSearch library. This lets you provide raw search parameters to the Algolia API:
 

instantsearch.widgets.configure({
  ruleContexts: ['desktop']
});

 
Here you can see a working implementation on InstantSearch.js: https://codesandbox.io/s/async-framework-9pmnpg?file=/src/app.js