Predicate logic with rule composition

Predicated is a simple predicate model for Ruby.

Predicateable allows you to define predicate methods (like `admin?`) based on a method that returns a Symbol. Similar to Rails enums, with optional strict checking and prefix support.

This plugin implements Flickr's machine tags as explained here[http://www.flickr.com/groups/api/discuss/72157594497877875] while still maintaining standard tagging behavior. Basically, a machine tag has a namespace, a predicate and a value in the format [namespace]:[predicate]=[value] This...

Predicate provides a simple class and processors to encode and manipulate (tuple) predicates

Parse Cappuccino Literal predicated and sort descriptors to arel expressions

Finally attr_accessor? & attr_reader? with question marks for booleans/predicates!? To get started, pick one: (1) in your class/module, add `using AttrBool::Ref`, or (2) in your class/module, add `extend AttrBool::Ext`, or (3) in your app/script (not library), include `require 'attr_bool/c...

Simple predicate methods that make case statements better

Adds support for .predicate? methods to MiniTest (via method_missing)

Adds automatic generation of predicate methods for attributes

Predicate-centric classification toolkit

MetaWhere offers the ability to call any Arel predicate methods (with a few convenient aliases) on your Model's attributes instead of the ones normally offered by ActiveRecord's hash parameters. It also adds convenient syntax for order clauses, smarter mapping of nested h...

RConditions generates a bang method (for example, Array#empty!) for each predicate method (for example, Array#empty?). The bang method will return true if the predicate method returns true, otherwise it will throw an exception. The exception will include auto-generated modules that give informati...

Wrong provides a general assert method that takes a predicate block. Assertion failure messages are rich in detail. The Wrong idea is to replace all those countless assert_this, assert_that library methods which only exist to give a more useful failure message than "assertion failed". Wrong repla...

Capybara provides excellent error messages for its built in predicate methods: has_selector?, has_text?, has_title? etc.. but when those are used from Page Objects while exposing predicate methods from the ...

Predicate methods for those curious about their datastructures. Provides String, Array, and Hash subclasses with dynamic predicate methods that allow you to interrogate the contents of the most common Ruby datastructures in a readable, friendly fashion. Also allows you to au...

'cont_any_word' predicate for Ransack.

Restores response predicates removed from ActionDispatch::TestResponse in Rails 6

Use arel predicates directly from where.

Small DSL to create ActiveRecord (>= 3.1) attribute predicates without writing SQL.