upto 3.10

app/models/beerclub.rb

@@ -0,0 +1,16 @@
+class Beerclub < ApplicationRecord
+  has_many :memberships, dependent: :destroy
+  has_many :users, through: :membership
+
+  validates :name, presence: true
+  validates :founded, numericality: { greater_than_or_equal_to: 1040,
+                                      only_integer: true }
+  validate :creation_year_not_in_future
+
+  def creation_year_not_in_future
+    if founded > Time.now.year
+      errors.add :founded, "cannot be in the future"
+    end
+  end
+
+end

app/models/membership.rb

@@ -0,0 +1,4 @@
+class Membership < ApplicationRecord
+  belongs_to :user
+  belongs_to :beerclub
+end

app/models/user.rb

@@ -5,4 +5,6 @@ class User < ApplicationRecord
 
   has_many :ratings
   has_many :beers, through: :ratings
+  has_many :memberships, dependent: :destroy
+  has_many :beer_clubs, through: :memberships
 end