remove currency model and all references

app/graphql/mutations/create_buy_crypto_order.rb

@@ -6,8 +6,6 @@ module Mutations
     argument :order, Inputs::CreateBuyCryptoOrderAttributesInput, required: true
 
     def resolve(order:)
-      currency_id = decode_id(order[:currency_id])
-
       ActiveRecord::Base.transaction do
         current_user
           .fiat_balance
@@ -15,7 +13,6 @@ module Mutations
 
         record = BuyCryptoOrder.create!(
           paid_amount_cents: order[:amount_cents],
-          currency_id: currency_id,
           user_id: current_user.id,
         )
 

app/graphql/mutations/create_sell_crypto_order.rb

@@ -6,18 +6,15 @@ module Mutations
     argument :order, Inputs::CreateSellCryptoOrderAttributesInput, required: true
 
     def resolve(order:)
-      currency_id = decode_id(order[:currency_id])
       amount = BigDecimal(order[:amount])
 
       ActiveRecord::Base.transaction do
         current_user
-          .balances
-          .find_by!(currency_id: currency_id)
+          .balance
           .withdrawal!(amount)
 
         record = SellCryptoOrder.create!(
           paid_amount: amount,
-          currency_id: currency_id,
           user_id: current_user.id,
         )
 

app/graphql/mutations/create_stake_order.rb

@@ -6,18 +6,15 @@ module Mutations
     argument :order, Inputs::CreateStakeOrderAttributesInput, required: true
 
     def resolve(order:)
-      currency_id = Currency.find_by!(name: "CAKE").id
       amount = BigDecimal(order[:amount])
 
       ActiveRecord::Base.transaction do
         current_user
-          .balances
-          .find_by!(currency_id: currency_id)
+          .balance
           .withdrawal!(amount)
 
         record = StakeOrder.create!(
           amount: amount,
-          currency_id: currency_id,
           pool_name: order[:pool_name],
           user_id: current_user.id,
         )

app/graphql/mutations/create_stake_remove_order.rb

@@ -6,14 +6,12 @@ module Mutations
     argument :order, Inputs::CreateStakeOrderAttributesInput, required: true
 
     def resolve(order:)
-      currency_id = Currency.find_by!(name: "CAKE").id
       amount = -BigDecimal(order[:amount])
 
       ActiveRecord::Base.transaction do
         record = StakeOrder.find_or_initialize_by(
           pool_name: order[:pool_name],
           user_id: current_user.id,
-          currency_id: currency_id,
           status: :processing
         )