add active in period for the requirement

app/models/requirement.rb

@@ -31,4 +31,6 @@ class Requirement < ApplicationRecord
   validates :coverage, presence: true
   validates :start_date, presence: true
   validates :end_date, presence: true
+
+  scope :active_in_period, ->(start_date, end_date) { where('start_date <= ? AND end_date >= ?', end_date, start_date) }
 end

spec/models/requirement_spec.rb

@@ -35,4 +35,43 @@
     it { should belong_to(:profession) }
     it { should have_many(:assignments) }
   end
+
+  describe 'methods' do
+    context '#active_in_period' do
+      it 'should return true if dates are fully in the period' do
+        FactoryBot.create(:requirement, start_date: '2020-01-01',
+                                        end_date: '2020-01-31')
+
+        expect(Requirement.active_in_period('2020-01-05', '2020-01-28').length).to eq(1)
+      end
+
+      it 'should return true if start date is in the period but the end date is out' do
+        FactoryBot.create(:requirement, start_date: '2020-01-01',
+                                        end_date: '2020-01-31')
+
+        expect(Requirement.active_in_period('2020-01-05', '2020-02-28').length).to eq(1)
+      end
+
+      it 'should return true if start date is out of the period but the end date is in' do
+        FactoryBot.create(:requirement, start_date: '2020-01-01',
+                                        end_date: '2020-01-31')
+
+        expect(Requirement.active_in_period('2019-01-05', '2020-02-28').length).to eq(1)
+      end
+
+      it 'should return true if both dates cover the start and end date' do
+        FactoryBot.create(:requirement, start_date: '2020-01-01',
+                                        end_date: '2020-01-31')
+
+        expect(Requirement.active_in_period('2019-01-05', '2021-02-28').length).to eq(1)
+      end
+
+      it 'should return false if dates are fully out of the period' do
+        FactoryBot.create(:requirement, start_date: '2020-01-01',
+                                        end_date: '2020-01-31')
+
+        expect(Requirement.active_in_period('2020-02-01', '2020-02-28').length).to eq(0)
+      end
+    end
+  end
 end