remove currency model and all references

app/models/balance.rb

@@ -4,28 +4,24 @@
 #
 # Table name: balances
 #
-#  id          :bigint           not null, primary key
-#  amount      :decimal(20, 10)  default(0.0), not null
-#  created_at  :datetime         not null
-#  updated_at  :datetime         not null
-#  currency_id :bigint           not null
-#  user_id     :bigint           not null
+#  id         :bigint           not null, primary key
+#  amount     :decimal(20, 10)  default(0.0), not null
+#  created_at :datetime         not null
+#  updated_at :datetime         not null
+#  user_id    :bigint           not null
 #
 # Indexes
 #
-#  index_balances_on_currency_id  (currency_id)
-#  index_balances_on_user_id      (user_id)
+#  index_balances_on_user_id  (user_id)
 #
 # Foreign Keys
 #
-#  fk_rails_...  (currency_id => currencies.id)
 #  fk_rails_...  (user_id => users.id)
 #
 class Balance < ApplicationRecord
   include Trackable
 
   belongs_to :user
-  belongs_to :currency
 
   validates :amount, presence: true, numericality: { greater_than_or_equal_to: 0 }
 

app/models/buy_crypto_order.rb

@@ -10,17 +10,14 @@
 #  status            :string           not null
 #  created_at        :datetime         not null
 #  updated_at        :datetime         not null
-#  currency_id       :bigint           not null
 #  user_id           :bigint           not null
 #
 # Indexes
 #
-#  index_buy_crypto_orders_on_currency_id  (currency_id)
-#  index_buy_crypto_orders_on_user_id      (user_id)
+#  index_buy_crypto_orders_on_user_id  (user_id)
 #
 # Foreign Keys
 #
-#  fk_rails_...  (currency_id => currencies.id)
 #  fk_rails_...  (user_id => users.id)
 #
 class BuyCryptoOrder < ApplicationRecord
@@ -28,7 +25,6 @@ class BuyCryptoOrder < ApplicationRecord
   include Notifiable
 
   belongs_to :user
-  belongs_to :currency
 
   monetize :paid_amount_cents
 

app/models/currency.rb

@@ -1,14 +0,0 @@
-# frozen_string_literal: true
-
-# == Schema Information
-#
-# Table name: currencies
-#
-#  id         :bigint           not null, primary key
-#  name       :string           not null
-#  created_at :datetime         not null
-#  updated_at :datetime         not null
-#
-class Currency < ApplicationRecord
-  validates :name, presence: true
-end

app/models/sell_crypto_order.rb

@@ -10,17 +10,14 @@
 #  status                :string           not null
 #  created_at            :datetime         not null
 #  updated_at            :datetime         not null
-#  currency_id           :bigint           not null
 #  user_id               :bigint           not null
 #
 # Indexes
 #
-#  index_sell_crypto_orders_on_currency_id  (currency_id)
-#  index_sell_crypto_orders_on_user_id      (user_id)
+#  index_sell_crypto_orders_on_user_id  (user_id)
 #
 # Foreign Keys
 #
-#  fk_rails_...  (currency_id => currencies.id)
 #  fk_rails_...  (user_id => users.id)
 #
 class SellCryptoOrder < ApplicationRecord
@@ -28,7 +25,6 @@ class SellCryptoOrder < ApplicationRecord
   include Notifiable
 
   belongs_to :user
-  belongs_to :currency
 
   monetize :received_amount_cents
 
@@ -41,7 +37,7 @@ class SellCryptoOrder < ApplicationRecord
     "
     💸 New sell crypto order! 💸\n
     user: #{user.email} \n
-    amount: #{paid_amount} #{currency.name}
+    amount: #{paid_amount} CAKE
     "
   end
 end

app/models/stake_order.rb

@@ -4,23 +4,20 @@
 #
 # Table name: stake_orders
 #
-#  id          :bigint           not null, primary key
-#  amount      :decimal(20, 10)  default(0.0), not null
-#  pool_name   :string           not null
-#  status      :string           not null
-#  created_at  :datetime         not null
-#  updated_at  :datetime         not null
-#  currency_id :bigint
-#  user_id     :bigint           not null
+#  id         :bigint           not null, primary key
+#  amount     :decimal(20, 10)  default(0.0), not null
+#  pool_name  :string           not null
+#  status     :string           not null
+#  created_at :datetime         not null
+#  updated_at :datetime         not null
+#  user_id    :bigint           not null
 #
 # Indexes
 #
-#  index_stake_orders_on_currency_id  (currency_id)
-#  index_stake_orders_on_user_id      (user_id)
+#  index_stake_orders_on_user_id  (user_id)
 #
 # Foreign Keys
 #
-#  fk_rails_...  (currency_id => currencies.id)
 #  fk_rails_...  (user_id => users.id)
 #
 class StakeOrder < ApplicationRecord
@@ -28,7 +25,6 @@ class StakeOrder < ApplicationRecord
   include Notifiable
 
   belongs_to :user
-  belongs_to :currency
 
   validates :pool_name, presence: true
   validates :amount, presence: true

app/models/user.rb

@@ -29,7 +29,7 @@ class User < ApplicationRecord
 
   has_many :documents, class_name: "UserDocument", dependent: :destroy
   has_many :stake_orders, dependent: :restrict_with_error
-  has_many :balances, dependent: :restrict_with_error
+  has_one :balance, dependent: :restrict_with_error
   has_one :fiat_balance, dependent: :restrict_with_error
 
   validates :first_name, :last_name, :email, presence: true