feat: add balance field to budget (#180)

This will facilitate the frontend implementation. The actual value is not computed as of now.

Author: morremeyer

api/docs.go

@@ -1874,6 +1874,9 @@ const docTemplate = `{
         "controllers.Budget": {
             "type": "object",
             "properties": {
+                "balance": {
+                    "type": "number"
+                },
                 "createdAt": {
                     "type": "string",
                     "example": "2022-04-02T19:28:44.491514Z"

api/swagger.json

@@ -1862,6 +1862,9 @@
         "controllers.Budget": {
             "type": "object",
             "properties": {
+                "balance": {
+                    "type": "number"
+                },
                 "createdAt": {
                     "type": "string",
                     "example": "2022-04-02T19:28:44.491514Z"

api/swagger.yaml

@@ -95,6 +95,8 @@ definitions:
     type: object
   controllers.Budget:
     properties:
+      balance:
+        type: number
       createdAt:
         example: "2022-04-02T19:28:44.491514Z"
         type: string

pkg/models/budget.go

@@ -4,6 +4,7 @@ import (
 	"time"
 
 	"github.com/google/uuid"
+	"github.com/shopspring/decimal"
 )
 
 // Budget represents a budget
@@ -13,6 +14,7 @@ import (
 type Budget struct {
 	Model
 	BudgetCreate
+	Balance decimal.Decimal `json:"balance" gorm:"-"`
 }
 
 type BudgetCreate struct {