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igmarin/rails-agent-skills

Curated library of 42 public AI agent skills for Ruby on Rails development, plus 5 callable workflow skills. Organized by category: planning, testing, code-quality, ddd, engines, infrastructure, api, patterns, context, orchestration, and workflows. Covers code review, architecture, security, testing (RSpec), engines, service objects, DDD patterns, and TDD automation.

96

Quality

96%

Does it follow best practices?

Impact

—

No eval scenarios have been run

SecuritybySnyk

Risky

Do not use without reviewing

Overview
Quality
Evals
Security
Files

TESTING.mdskills/patterns/implement-calculator-pattern/

Strategy + Factory + Null Object — RSpec Examples

Factory Spec (all dispatch branches)

RSpec.describe PricingCalculator::Factory do
  describe '.for' do
    let(:order) { create(:order) }

    context 'when plan is nil' do
      before { order.update!(plan: nil) }
      it { expect(described_class.for(order)).to be_a(PricingCalculator::NullService) }
    end

    context 'when plan is inactive' do
      before { order.plan.update!(active: false) }
      it { expect(described_class.for(order)).to be_a(PricingCalculator::NullService) }
    end

    context 'when plan is standard' do
      before { order.plan.update!(name: 'standard', active: true) }
      it { expect(described_class.for(order)).to be_a(PricingCalculator::StandardPricingService) }
    end

    context 'when plan name is unknown' do
      before { order.plan.update!(name: 'enterprise', active: true) }
      it { expect(described_class.for(order)).to be_a(PricingCalculator::NullService) }
    end
  end
end

NullService Spec

RSpec.describe PricingCalculator::NullService do
  let(:order) { create(:order) }

  it 'always returns nil' do
    expect(described_class.new(order).calculate).to be_nil
  end
end

Concrete Service Spec

RSpec.describe PricingCalculator::StandardPricingService do
  let(:order) { create(:order, :with_standard_plan, base_price: 100) }

  describe '#calculate' do
    it 'returns the discounted price for standard plans' do
      expect(described_class.new(order).calculate).to eq(90)
    end

    context 'when plan is inactive' do
      before { order.plan.update!(active: false) }
      it { expect(described_class.new(order).calculate).to be_nil }
    end
  end
end

skills

patterns

implement-calculator-pattern

IMPLEMENTATION.md

SKILL.md

TESTING.md

README.md

tile.json