nathanvda/cocoon

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

3072 stars · 376 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

A Ruby gem for Ruby on Rails that simplifies building dynamic nested forms, allowing users to add and remove nested model fields (e.g., tasks within a project) via jQuery. It is form builder-agnostic and works with standard Rails forms, Formtastic, and SimpleForm.

Use cases

• add nested form fields dynamically in rails
• invoice with line items form rails
• project with tasks nested attributes form
• add and remove nested model fields with jquery
• nested forms with simple_form or formtastic
• accepts_nested_attributes_for dynamic form

When to choose

• You have a Rails app already using jQuery and need dynamic nested forms
• You use Formtastic or SimpleForm and want builder-agnostic nested form support
• You need add/remove links for nested models like line items or tasks

When to avoid

• You use a modern JavaScript framework like React or Vue for forms
• You want a jQuery-free solution (vanilla alternatives exist on npm)
• You are starting a new Rails 7+ project without jQuery

Facets

library · maturity maintenance

form-handling ui-components web-development frontend ruby browser rails nested-forms jquery formtastic simple-form ruby-gem web-server

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