Client API Builder generates HTTP client methods from a declarative route DSL. It infers HTTP methods from route names, builds query strings and request bodies, and supports nested routers, configurable retries, and streaming responses to files or IO. SSL verification, base URL scheme checks, and...

Streaming tools for CSV files too big or too broken to load into memory. Compare two sorted files into create, update and delete actions, sort with an external merge sort, transform and extend rows in batches, and build reports from Ruby objects. Detects separators, byte order marks and encodings...

Dynamic Active Model automatically discovers database schemas and creates ActiveRecord models without manual class definitions. It detects and configures relationships (belongs_to, has_many, has_one, has_and_belongs_to_many) based on foreign keys and constraints, handles dangerous attribute names...

Easy way to configure what data is mapped between models

Declare once how fields map from one object to another, and Mappable compiles it into plain Ruby methods that copy the data both ways at close to hand-written speed. Rename fields, combine several into one (first_name + last_name -> name) and split them back out, and skip fields with conditions o...

Declare typed attributes and Schema turns incoming hashes, JSON and CSV rows into Ruby objects. Values are coerced to integers, floats, booleans, dates, times, arrays and hashes, and bad input is recorded as parsing errors instead of raised. Supports nested has_one/has_many associations, polymorp...

Easy way to normalize attributes