Question 1

How to use Jbuilder without Rails?

Accepted Answer

You can instantiate Jbuilder objects manually using Jbuilder.new and call target! to generate JSON, but you'll need to handle context and helpers yourself. The README shows examples with to_builder methods in models for standalone use.

Question 2

Jbuilder vs ActiveModelSerializers: which is better for Rails APIs?

Accepted Answer

Jbuilder is ideal for declarative, view-like JSON with complex logic and conditionals, while ActiveModelSerializers excels at convention-based serialization tied to models. Choose Jbuilder for flexibility and readability, or AMS for structure and less boilerplate.

Question 3

How to cache JSON responses with Jbuilder in Rails?

Accepted Answer

Use json.cache! blocks with cache keys and expiration times, or leverage the cached: true option with partials for collections. This integrates with Rails.cache to store fragments, as detailed in the README's caching section.

Question 4

Jbuilder key formatting to camelCase example?

Accepted Answer

Call json.key_format! camelize: :lower in your template to convert snake_case keys to camelCase. For nested structures, add json.deep_format_keys! to apply formatting recursively, ensuring consistent API outputs.

Question 5

How to handle nested arrays and loops in Jbuilder?

Accepted Answer

Use json.array! with blocks or pass collections directly, and combine with partials for reuse. The README demonstrates this with comments and attachments arrays, including conditional skipping of elements.

Question 6

Jbuilder performance issues: how to optimize?

Accepted Answer

Minimize logic in templates, use caching aggressively, and avoid deep nesting. Profile responses to identify bottlenecks; consider raw JSON generation for critical paths where DSL overhead is too high.

Jbuilder

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