Generate Ruby on Rails Models and Migrations with Claude

Writing Rails migrations and models by hand means remembering column types, index syntax, and association macros every time. Claude can generate the whole stack from a plain-English description.

Create a Rails data model for a project management app with:
- Users (name, email, timestamps)
- Projects (belongs to user, name, description, status enum)
- Tasks (belongs to project, title, due_date, completed boolean)
- Add appropriate indexes and foreign keys

Claude will output migration files with the correct create_table syntax and a matching set of ActiveRecord models complete with belongs_to, has_many, validations, and scope suggestions. For enums, it will use Rails' built-in enum macro and suggest a sensible set of values.

It also knows to add null: false constraints and database-level indexes for foreign keys — the kind of detail that's easy to forget in a first pass.

# Claude-generated snippet
class Task < ApplicationRecord
  belongs_to :project
  scope :incomplete, -> { where(completed: false) }
  scope :overdue, -> { where("due_date < ?", Date.today).incomplete }
  validates :title, presence: true
end

You can follow up with "add a polymorphic comments association" or "generate factory_bot factories for all three models" to keep the momentum going.

Tell Claude what your domain looks like, and it'll give you Rails-ready code that follows conventions from migrations all the way to model validations.