creates system, package & vulnerability models

app/models/package.rb

+class Package < ActiveRecord::Base
+  has_and_belongs_to_many :vulnerabilities
+  has_and_belongs_to_many :systems
+end

app/models/system.rb

+class System < ActiveRecord::Base
+  has_and_belongs_to_many :packages
+  has_many :vulnerabilities, through: :packages
+end

app/models/vulnerability.rb

+class Vulnerability < ActiveRecord::Base
+  has_and_belongs_to_many :packages
+  has_many :systems, through: :packages
+end

db/migrate/20160130061551_create_systems.rb

+class CreateSystems < ActiveRecord::Migration
+  def change
+    create_table :systems do |t|
+      t.string :hostname
+      t.string :os
+
+      t.timestamps null: false
+    end
+    add_index :systems, :os
+  end
+end

db/migrate/20160130061647_create_packages.rb

+class CreatePackages < ActiveRecord::Migration
+  def change
+    create_table :packages do |t|
+      t.string :name
+      t.string :version
+      t.string :repository
+
+      t.timestamps null: false
+    end
+    add_index :packages, :repository
+  end
+end

db/migrate/20160130061938_create_vulnerabilities.rb

+class CreateVulnerabilities < ActiveRecord::Migration
+  def change
+    create_table :vulnerabilities do |t|
+      t.string :advisory_id
+      t.string :severity
+      t.date :date_reported
+      t.text :synopsis
+      t.string :cve_id
+
+      t.timestamps null: false
+    end
+    add_index :vulnerabilities, :severity
+  end
+end

spec/factories/packages.rb

+FactoryGirl.define do
+  factory :package do
+    name "MyString"
+    version "MyString"
+    repository "MyString"
+  end
+
+end

spec/factories/systems.rb

+FactoryGirl.define do
+  factory :system do
+    hostname "MyString"
+    os "MyString"
+  end
+
+end

spec/factories/vulnerabilities.rb

+FactoryGirl.define do
+  factory :vulnerability do
+    advisory_id "MyString"
+    severity "MyString"
+    date_reported "2016-01-29"
+    synopsis "MyText"
+    cve_id "MyString"
+  end
+
+end

spec/models/package_spec.rb

+require 'rails_helper'
+
+RSpec.describe Package, type: :model do
+  pending "add some examples to (or delete) #{__FILE__}"
+end

spec/models/system_spec.rb

+require 'rails_helper'
+
+RSpec.describe System, type: :model do
+  pending "add some examples to (or delete) #{__FILE__}"
+end

spec/models/vulnerability_spec.rb

+require 'rails_helper'
+
+RSpec.describe Vulnerability, type: :model do
+  pending "add some examples to (or delete) #{__FILE__}"
+end