Handle money_move request and create records based on params

app/controllers/money_moves_controller.rb

@@ -4,19 +4,20 @@ class MoneyMovesController < ApplicationController
   end
 
   def create
-   money_move = MoneyMove.create_move(money_move_params)
-   if money_move.save
-     json_response(money_move)
-   else
-     error_response(:bad_request)
-   end
+    money_move = MoneyMove.create_move(money_move_params)
+
+    if money_move
+      json_response(money_move)
+    else
+      error_response(:bad_request)
+    end
   end
 
-  def money_move_params 
+  def money_move_params
     params.require(:money_move).permit(
-      :description, 
-      :amount, 
-      :from_homie_id, 
+      :description,
+      :amount,
+      :from_homie_id,
       :to_homie_id
     )
   end

app/models/money_move.rb

@@ -1,25 +1,64 @@
 class MoneyMove < ApplicationRecord
   belongs_to :homie
 
-  def create_move(params)
-    common_params = { description: params[:description] } 
+  def self.create_move(params)
+    return false unless valid_money_move?(params)
 
-    move_from = MoneyMove.new(
-      common_params + { 
-        homie_id: params[:from_homie_id],
-        amount: -BigDecimal.new(params[:amount])   
-      } 
-    )
-    move_to = MoneyMove.new(
-      common_params + { 
-        homie_id: params[:from_homie_id],
-        amount: BigDecimal.new(params[:amount])
-      }
-    )
+    move_from = create_move_from(params) if double_money_move?(params)
+    move_to = create_move_to(params)
 
-    MoneyMove.transaction do 
-      move_from.save!
+    MoneyMove.transaction do
+      move_from.save! if move_from.present?
       move_to.save!
     end
   end
+
+  class << self
+    private
+
+    def valid_money_move?(params)
+      params[:amount].present? && params[:to_homie_id].present?
+    end
+
+    def double_money_move?(params)
+      params[:from_homie_id].present? && params[:to_homie_id].present?
+    end
+
+    def from_source_name(params)
+      if double_money_move?(params)
+        Homie.find(params[:from_homie_id]).name
+      else
+        'External'
+      end
+    end
+
+    def old_desc(params)
+      if params[:description].present?
+        "#{params[:description]} - "
+      else
+        ''
+      end
+    end
+
+    def create_move_from(params)
+      to_homie_name = Homie.find(params[:to_homie_id]).name
+      added_desc = "[To: #{to_homie_name}]"
+      new_desc = "#{old_desc(params)}#{added_desc}"
+      MoneyMove.new(
+        homie_id: params[:from_homie_id],
+        amount: -params[:amount].to_d,
+        description: new_desc
+      )
+    end
+
+    def create_move_to(params)
+      added_desc = "[From: #{from_source_name(params)}]"
+      new_desc = "#{old_desc(params)}#{added_desc}"
+      MoneyMove.new(
+        homie_id: params[:to_homie_id],
+        amount: params[:amount].to_d,
+        description: new_desc
+      )
+    end
+  end
 end