Merge pull request #8 from exstake/fiat-balances-list

add fiat balance

Gemfile

@@ -20,6 +20,7 @@ gem "devise-i18n"
 gem "administrate-field-active_storage"
 gem "tailwindcss-rails"
 gem "administrate"
+gem "money-rails"
 gem "enumerize"
 gem "graphql"
 gem "pundit"

Gemfile.lock

@@ -157,6 +157,15 @@ GEM
     minitest (5.14.4)
     momentjs-rails (2.20.1)
       railties (>= 3.1)
+    monetize (1.9.4)
+      money (~> 6.12)
+    money (6.13.8)
+      i18n (>= 0.6.4, <= 2)
+    money-rails (1.14.0)
+      activesupport (>= 3.0)
+      monetize (~> 1.9.0)
+      money (~> 6.13.2)
+      railties (>= 3.0)
     msgpack (1.4.2)
     nio4r (2.5.8)
     nokogiri (1.12.1)
@@ -330,6 +339,7 @@ DEPENDENCIES
   graphql_playground-rails
   image_processing (~> 1.12)
   listen (~> 3.3)
+  money-rails
   pg (~> 1.1)
   pry-byebug
   puma (~> 5.0)

app/graphql/types/fiat_balance_type.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+module Types
+  class FiatBalanceType < Types::BaseObject
+    implements GraphQL::Types::Relay::Node
+    global_id_field :id
+
+    graphql_name "FiatBalance"
+
+    field :id, ID, null: false
+    field :amount_cents, Integer, null: false
+    field :amount_currency, String, null: false
+    field :created_at, GraphQL::Types::ISO8601DateTime, null: false
+    field :updated_at, GraphQL::Types::ISO8601DateTime, null: false
+  end
+end

app/graphql/types/query_type.rb

@@ -13,5 +13,10 @@ module Types
     def balances
       Pundit.policy_scope(current_user, Balance)
     end
+
+    field :fiat_balances, FiatBalanceType.connection_type, null: false
+    def fiat_balances
+      Pundit.policy_scope(current_user, FiatBalance)
+    end
   end
 end

app/graphql/x_stake_schema.rb

@@ -10,6 +10,8 @@ class XStakeSchema < GraphQL::Schema
       Types::CurrencyType
     when Balance
       Types::BalanceType
+    when FiatBalance
+      Types::FiatBalanceType
     else
       raise(GraphQL::RequiredImplementationMissingError, "Unexpected object: #{obj}")
     end

app/javascript/__generated__/schema.graphql

@@ -1,5 +1,5 @@
 type Balance implements Node {
-  amount: Float!
+  amount: String!
   currency: Currency!
   id: ID!
 }
@@ -44,6 +44,54 @@ type Currency implements Node {
   name: String!
 }
 
+type FiatBalance implements Node {
+  amountCents: Int!
+  amountCurrency: String!
+  createdAt: ISO8601DateTime!
+  id: ID!
+  updatedAt: ISO8601DateTime!
+}
+
+"""
+The connection type for FiatBalance.
+"""
+type FiatBalanceConnection {
+  """
+  A list of edges.
+  """
+  edges: [FiatBalanceEdge]
+
+  """
+  A list of nodes.
+  """
+  nodes: [FiatBalance]
+
+  """
+  Information to aid in pagination.
+  """
+  pageInfo: PageInfo!
+}
+
+"""
+An edge in a connection.
+"""
+type FiatBalanceEdge {
+  """
+  A cursor for use in pagination.
+  """
+  cursor: String!
+
+  """
+  The item at the end of the edge.
+  """
+  node: FiatBalance
+}
+
+"""
+An ISO 8601-encoded datetime
+"""
+scalar ISO8601DateTime
+
 """
 An object with an ID.
 """
@@ -102,6 +150,27 @@ type Query {
     last: Int
   ): BalanceConnection!
   currentUser: User
+  fiatBalances(
+    """
+    Returns the elements in the list that come after the specified cursor.
+    """
+    after: String
+
+    """
+    Returns the elements in the list that come before the specified cursor.
+    """
+    before: String
+
+    """
+    Returns the first _n_ elements from the list.
+    """
+    first: Int
+
+    """
+    Returns the last _n_ elements from the list.
+    """
+    last: Int
+  ): FiatBalanceConnection!
 
   """
   Fetches an object given its ID.

app/javascript/src/pages/Wallet/Balances.tsx

@@ -0,0 +1,81 @@
+import { graphql } from "babel-plugin-relay/macro";
+import type { FC } from "react";
+import React from "react";
+import { useFragment } from "react-relay";
+
+import { getCurrencyLogo } from "../../utils/getCurrencyLogo";
+import type { Balances_balances$key } from "./__generated__/Balances_balances.graphql";
+
+type Props = {
+  balancesRef: Balances_balances$key;
+};
+export const Balances: FC<Props> = ({ balancesRef }) => {
+  const { nodes } = useFragment<Balances_balances$key>(
+    graphql`
+      fragment Balances_balances on BalanceConnection {
+        nodes {
+          id
+          amount
+          currency {
+            name
+          }
+        }
+      }
+    `,
+    balancesRef
+  );
+
+  return (
+    <div className="-mx-4 sm:-mx-8 px-4 sm:px-8 py-4 overflow-x-auto">
+      <div className="inline-block min-w-full shadow rounded-lg overflow-hidden">
+        <table className="min-w-full leading-normal">
+          <thead>
+            <tr>
+              <th
+                scope="col"
+                className="px-5 py-3 bg-white  border-b border-gray-200 text-gray-800  text-left text-sm uppercase font-normal"
+              >
+                Moeda
+              </th>
+              <th
+                scope="col"
+                className="px-5 py-3 bg-white  border-b border-gray-200 text-gray-800  text-left text-sm uppercase font-normal"
+              >
+                Saldo
+              </th>
+            </tr>
+          </thead>
+          <tbody>
+            {nodes?.map((balance) => {
+              return (
+                <tr key={balance?.id}>
+                  <td className="px-5 py-5 border-b border-gray-200 bg-white text-sm">
+                    <div className="flex items-center">
+                      <div className="flex-shrink-0">
+                        <img
+                          alt={`${balance?.currency.name} icon`}
+                          src={getCurrencyLogo(balance?.currency.name)}
+                          className="mx-auto object-cover rounded-full h-10 w-10 "
+                        />
+                      </div>
+                      <div className="ml-3">
+                        <p className="text-gray-900 whitespace-no-wrap">
+                          {balance?.currency.name}
+                        </p>
+                      </div>
+                    </div>
+                  </td>
+                  <td className="px-5 py-5 border-b border-gray-200 bg-white text-sm">
+                    <p className="text-gray-900 whitespace-no-wrap">
+                      {balance?.amount}
+                    </p>
+                  </td>
+                </tr>
+              );
+            })}
+          </tbody>
+        </table>
+      </div>
+    </div>
+  );
+};

app/javascript/src/pages/Wallet/FiatBalances.tsx

@@ -0,0 +1,58 @@
+import { graphql } from "babel-plugin-relay/macro";
+import type { FC } from "react";
+import React from "react";
+import { useFragment } from "react-relay";
+
+import type { FiatBalances_fiatBalances$key } from "./__generated__/FiatBalances_fiatBalances.graphql";
+
+type Props = {
+  fiatBalancesRef: FiatBalances_fiatBalances$key;
+};
+export const FiatBalances: FC<Props> = ({ fiatBalancesRef }) => {
+  const { nodes } = useFragment<FiatBalances_fiatBalances$key>(
+    graphql`
+      fragment FiatBalances_fiatBalances on FiatBalanceConnection {
+        nodes {
+          id
+          amountCents
+          amountCurrency
+        }
+      }
+    `,
+    fiatBalancesRef
+  );
+
+  if (!nodes?.length) return null;
+
+  const [firstResult] = nodes;
+
+  const amount = (
+    firstResult?.amountCents ? firstResult?.amountCents / 100 : 0
+  ).toFixed(2);
+
+  return (
+    <div className="shadow rounded-lg p-4 bg-white dark:bg-gray-800">
+      <div className="flex items-center">
+        <span className="rounded-xl relative p-4 bg-green-200">
+          <svg
+            width="40"
+            fill="currentColor"
+            height="40"
+            className="text-green-500 h-4 absolute top-1/2 left-1/2 transform -translate-x-1/2 -translate-y-1/2"
+            viewBox="0 0 1792 1792"
+            xmlns="http://www.w3.org/2000/svg"
+          >
+            <path d="M1362 1185q0 153-99.5 263.5t-258.5 136.5v175q0 14-9 23t-23 9h-135q-13 0-22.5-9.5t-9.5-22.5v-175q-66-9-127.5-31t-101.5-44.5-74-48-46.5-37.5-17.5-18q-17-21-2-41l103-135q7-10 23-12 15-2 24 9l2 2q113 99 243 125 37 8 74 8 81 0 142.5-43t61.5-122q0-28-15-53t-33.5-42-58.5-37.5-66-32-80-32.5q-39-16-61.5-25t-61.5-26.5-62.5-31-56.5-35.5-53.5-42.5-43.5-49-35.5-58-21-66.5-8.5-78q0-138 98-242t255-134v-180q0-13 9.5-22.5t22.5-9.5h135q14 0 23 9t9 23v176q57 6 110.5 23t87 33.5 63.5 37.5 39 29 15 14q17 18 5 38l-81 146q-8 15-23 16-14 3-27-7-3-3-14.5-12t-39-26.5-58.5-32-74.5-26-85.5-11.5q-95 0-155 43t-60 111q0 26 8.5 48t29.5 41.5 39.5 33 56 31 60.5 27 70 27.5q53 20 81 31.5t76 35 75.5 42.5 62 50 53 63.5 31.5 76.5 13 94z" />
+          </svg>
+        </span>
+        <p className="text-md text-black dark:text-white ml-2">Saldo Fiat</p>
+      </div>
+      <div className="flex flex-col justify-start">
+        <p className="text-gray-700 dark:text-gray-100 text-4xl text-left font-bold my-4">
+          {amount}
+          <span className="text-sm">{firstResult?.amountCurrency}</span>
+        </p>
+      </div>
+    </div>
+  );
+};

app/javascript/src/pages/Wallet/Wallet.tsx

@@ -3,21 +3,19 @@ import type { FC } from "react";
 import React from "react";
 import { useLazyLoadQuery } from "react-relay";
 
-import { getCurrencyLogo } from "../../utils/getCurrencyLogo";
+import { Balances } from "./Balances";
+import { FiatBalances } from "./FiatBalances";
 import type { WalletQuery } from "./__generated__/WalletQuery.graphql";
 
 export const Wallet: FC = () => {
-  const { balances } = useLazyLoadQuery<WalletQuery>(
+  const { fiatBalances, balances } = useLazyLoadQuery<WalletQuery>(
     graphql`
       query WalletQuery {
+        fiatBalances {
+          ...FiatBalances_fiatBalances
+        }
         balances {
-          nodes {
+          ...Balances_balances
-            id
-            amount
-            currency {
-              name
-            }
-          }
         }
       }
     `,
@@ -28,57 +26,8 @@ export const Wallet: FC = () => {
     <div className="flex flex-col h-full w-full overflow-x-hidden">
       <div className="container mx-auto px-4 sm:px-8 max-w-3xl">
         <div className="py-8">
-          <div className="-mx-4 sm:-mx-8 px-4 sm:px-8 py-4 overflow-x-auto">
+          <FiatBalances fiatBalancesRef={fiatBalances} />
-            <div className="inline-block min-w-full shadow rounded-lg overflow-hidden">
+          <Balances balancesRef={balances} />
-              <table className="min-w-full leading-normal">
-                <thead>
-                  <tr>
-                    <th
-                      scope="col"
-                      className="px-5 py-3 bg-white  border-b border-gray-200 text-gray-800  text-left text-sm uppercase font-normal"
-                    >
-                      Moeda
-                    </th>
-                    <th
-                      scope="col"
-                      className="px-5 py-3 bg-white  border-b border-gray-200 text-gray-800  text-left text-sm uppercase font-normal"
-                    >
-                      Saldo
-                    </th>
-                  </tr>
-                </thead>
-                <tbody>
-                  {balances.nodes?.map((balance) => {
-                    return (
-                      <tr key={balance?.id}>
-                        <td className="px-5 py-5 border-b border-gray-200 bg-white text-sm">
-                          <div className="flex items-center">
-                            <div className="flex-shrink-0">
-                              <img
-                                alt={`${balance?.currency.name} icon`}
-                                src={getCurrencyLogo(balance?.currency.name)}
-                                className="mx-auto object-cover rounded-full h-10 w-10 "
-                              />
-                            </div>
-                            <div className="ml-3">
-                              <p className="text-gray-900 whitespace-no-wrap">
-                                {balance?.currency.name}
-                              </p>
-                            </div>
-                          </div>
-                        </td>
-                        <td className="px-5 py-5 border-b border-gray-200 bg-white text-sm">
-                          <p className="text-gray-900 whitespace-no-wrap">
-                            {balance?.amount}
-                          </p>
-                        </td>
-                      </tr>
-                    );
-                  })}
-                </tbody>
-              </table>
-            </div>
-          </div>
         </div>
       </div>
     </div>

app/javascript/src/pages/Wallet/__generated__/Balances_balances.graphql.ts

@@ -0,0 +1,79 @@
+/* tslint:disable */
+/* eslint-disable */
+// @ts-nocheck
+
+import { ReaderFragment } from "relay-runtime";
+import { FragmentRefs } from "relay-runtime";
+export type Balances_balances = {
+    readonly nodes: ReadonlyArray<{
+        readonly id: string;
+        readonly amount: string;
+        readonly currency: {
+            readonly name: string;
+        };
+    } | null> | null;
+    readonly " $refType": "Balances_balances";
+};
+export type Balances_balances$data = Balances_balances;
+export type Balances_balances$key = {
+    readonly " $data"?: Balances_balances$data;
+    readonly " $fragmentRefs": FragmentRefs<"Balances_balances">;
+};
+
+
+
+const node: ReaderFragment = {
+  "argumentDefinitions": [],
+  "kind": "Fragment",
+  "metadata": null,
+  "name": "Balances_balances",
+  "selections": [
+    {
+      "alias": null,
+      "args": null,
+      "concreteType": "Balance",
+      "kind": "LinkedField",
+      "name": "nodes",
+      "plural": true,
+      "selections": [
+        {
+          "alias": null,
+          "args": null,
+          "kind": "ScalarField",
+          "name": "id",
+          "storageKey": null
+        },
+        {
+          "alias": null,
+          "args": null,
+          "kind": "ScalarField",
+          "name": "amount",
+          "storageKey": null
+        },
+        {
+          "alias": null,
+          "args": null,
+          "concreteType": "Currency",
+          "kind": "LinkedField",
+          "name": "currency",
+          "plural": false,
+          "selections": [
+            {
+              "alias": null,
+              "args": null,
+              "kind": "ScalarField",
+              "name": "name",
+              "storageKey": null
+            }
+          ],
+          "storageKey": null
+        }
+      ],
+      "storageKey": null
+    }
+  ],
+  "type": "BalanceConnection",
+  "abstractKey": null
+};
+(node as any).hash = '2704da1dc9949b1becbd9ec947c5ec33';
+export default node;

app/javascript/src/pages/Wallet/__generated__/FiatBalances_fiatBalances.graphql.ts

@@ -0,0 +1,66 @@
+/* tslint:disable */
+/* eslint-disable */
+// @ts-nocheck
+
+import { ReaderFragment } from "relay-runtime";
+import { FragmentRefs } from "relay-runtime";
+export type FiatBalances_fiatBalances = {
+    readonly nodes: ReadonlyArray<{
+        readonly id: string;
+        readonly amountCents: number;
+        readonly amountCurrency: string;
+    } | null> | null;
+    readonly " $refType": "FiatBalances_fiatBalances";
+};
+export type FiatBalances_fiatBalances$data = FiatBalances_fiatBalances;
+export type FiatBalances_fiatBalances$key = {
+    readonly " $data"?: FiatBalances_fiatBalances$data;
+    readonly " $fragmentRefs": FragmentRefs<"FiatBalances_fiatBalances">;
+};
+
+
+
+const node: ReaderFragment = {
+  "argumentDefinitions": [],
+  "kind": "Fragment",
+  "metadata": null,
+  "name": "FiatBalances_fiatBalances",
+  "selections": [
+    {
+      "alias": null,
+      "args": null,
+      "concreteType": "FiatBalance",
+      "kind": "LinkedField",
+      "name": "nodes",
+      "plural": true,
+      "selections": [
+        {
+          "alias": null,
+          "args": null,
+          "kind": "ScalarField",
+          "name": "id",
+          "storageKey": null
+        },
+        {
+          "alias": null,
+          "args": null,
+          "kind": "ScalarField",
+          "name": "amountCents",
+          "storageKey": null
+        },
+        {
+          "alias": null,
+          "args": null,
+          "kind": "ScalarField",
+          "name": "amountCurrency",
+          "storageKey": null
+        }
+      ],
+      "storageKey": null
+    }
+  ],
+  "type": "FiatBalanceConnection",
+  "abstractKey": null
+};
+(node as any).hash = '0584f36abe6ca6f8612b8c593c4cfb6d';
+export default node;

app/javascript/src/pages/Wallet/__generated__/WalletQuery.graphql.ts

@@ -3,16 +3,14 @@
 // @ts-nocheck
 
 import { ConcreteRequest } from "relay-runtime";
+import { FragmentRefs } from "relay-runtime";
 export type WalletQueryVariables = {};
 export type WalletQueryResponse = {
-    readonly balances: {
+    readonly fiatBalances: {
-        readonly nodes: ReadonlyArray<{
+        readonly " $fragmentRefs": FragmentRefs<"FiatBalances_fiatBalances">;
-            readonly id: string;
-            readonly amount: number;
-            readonly currency: {
-                readonly name: string;
     };
-        } | null> | null;
+    readonly balances: {
+        readonly " $fragmentRefs": FragmentRefs<"Balances_balances">;
     };
 };
 export type WalletQuery = {
@@ -24,7 +22,15 @@ export type WalletQuery = {
 
 /*
 query WalletQuery {
+  fiatBalances {
+    ...FiatBalances_fiatBalances
+  }
   balances {
+    ...Balances_balances
+  }
+}
+
+fragment Balances_balances on BalanceConnection {
   nodes {
     id
     amount
@@ -34,6 +40,13 @@ query WalletQuery {
     }
   }
 }
+
+fragment FiatBalances_fiatBalances on FiatBalanceConnection {
+  nodes {
+    id
+    amountCents
+    amountCurrency
+  }
 }
 */
 
@@ -44,20 +57,6 @@ var v0 = {
   "kind": "ScalarField",
   "name": "id",
   "storageKey": null
-},
-v1 = {
-  "alias": null,
-  "args": null,
-  "kind": "ScalarField",
-  "name": "amount",
-  "storageKey": null
-},
-v2 = {
-  "alias": null,
-  "args": null,
-  "kind": "ScalarField",
-  "name": "name",
-  "storageKey": null
 };
 return {
   "fragment": {
@@ -66,6 +65,22 @@ return {
     "metadata": null,
     "name": "WalletQuery",
     "selections": [
+      {
+        "alias": null,
+        "args": null,
+        "concreteType": "FiatBalanceConnection",
+        "kind": "LinkedField",
+        "name": "fiatBalances",
+        "plural": false,
+        "selections": [
+          {
+            "args": null,
+            "kind": "FragmentSpread",
+            "name": "FiatBalances_fiatBalances"
+          }
+        ],
+        "storageKey": null
+      },
       {
         "alias": null,
         "args": null,
@@ -75,29 +90,9 @@ return {
         "plural": false,
         "selections": [
           {
-            "alias": null,
             "args": null,
-            "concreteType": "Balance",
+            "kind": "FragmentSpread",
-            "kind": "LinkedField",
+            "name": "Balances_balances"
-            "name": "nodes",
-            "plural": true,
-            "selections": [
-              (v0/*: any*/),
-              (v1/*: any*/),
-              {
-                "alias": null,
-                "args": null,
-                "concreteType": "Currency",
-                "kind": "LinkedField",
-                "name": "currency",
-                "plural": false,
-                "selections": [
-                  (v2/*: any*/)
-                ],
-                "storageKey": null
-              }
-            ],
-            "storageKey": null
           }
         ],
         "storageKey": null
@@ -112,6 +107,43 @@ return {
     "kind": "Operation",
     "name": "WalletQuery",
     "selections": [
+      {
+        "alias": null,
+        "args": null,
+        "concreteType": "FiatBalanceConnection",
+        "kind": "LinkedField",
+        "name": "fiatBalances",
+        "plural": false,
+        "selections": [
+          {
+            "alias": null,
+            "args": null,
+            "concreteType": "FiatBalance",
+            "kind": "LinkedField",
+            "name": "nodes",
+            "plural": true,
+            "selections": [
+              (v0/*: any*/),
+              {
+                "alias": null,
+                "args": null,
+                "kind": "ScalarField",
+                "name": "amountCents",
+                "storageKey": null
+              },
+              {
+                "alias": null,
+                "args": null,
+                "kind": "ScalarField",
+                "name": "amountCurrency",
+                "storageKey": null
+              }
+            ],
+            "storageKey": null
+          }
+        ],
+        "storageKey": null
+      },
       {
         "alias": null,
         "args": null,
@@ -129,7 +161,13 @@ return {
             "plural": true,
             "selections": [
               (v0/*: any*/),
-              (v1/*: any*/),
+              {
+                "alias": null,
+                "args": null,
+                "kind": "ScalarField",
+                "name": "amount",
+                "storageKey": null
+              },
               {
                 "alias": null,
                 "args": null,
@@ -138,7 +176,13 @@ return {
                 "name": "currency",
                 "plural": false,
                 "selections": [
-                  (v2/*: any*/),
+                  {
+                    "alias": null,
+                    "args": null,
+                    "kind": "ScalarField",
+                    "name": "name",
+                    "storageKey": null
+                  },
                   (v0/*: any*/)
                 ],
                 "storageKey": null
@@ -152,14 +196,14 @@ return {
     ]
   },
   "params": {
-    "cacheID": "6b8d0c664bd2d9df4d323c19c4a823a5",
+    "cacheID": "82d013e2bf418b53aeec5412f2f92661",
     "id": null,
     "metadata": {},
     "name": "WalletQuery",
     "operationKind": "query",
-    "text": "query WalletQuery {\n  balances {\n    nodes {\n      id\n      amount\n      currency {\n        name\n        id\n      }\n    }\n  }\n}\n"
+    "text": "query WalletQuery {\n  fiatBalances {\n    ...FiatBalances_fiatBalances\n  }\n  balances {\n    ...Balances_balances\n  }\n}\n\nfragment Balances_balances on BalanceConnection {\n  nodes {\n    id\n    amount\n    currency {\n      name\n      id\n    }\n  }\n}\n\nfragment FiatBalances_fiatBalances on FiatBalanceConnection {\n  nodes {\n    id\n    amountCents\n    amountCurrency\n  }\n}\n"
   }
 };
 })();
-(node as any).hash = '428f4f1ab769f9056dd38ec641a30733';
+(node as any).hash = '855efce679c691a77938b64376a1a805';
 export default node;

app/models/fiat_balance.rb

@@ -0,0 +1,28 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: fiat_balances
+#
+#  id              :bigint           not null, primary key
+#  amount_cents    :integer          default(0), not null
+#  amount_currency :string           default("BRL"), not null
+#  created_at      :datetime         not null
+#  updated_at      :datetime         not null
+#  user_id         :bigint           not null
+#
+# Indexes
+#
+#  index_fiat_balances_on_user_id  (user_id)
+#
+# Foreign Keys
+#
+#  fk_rails_...  (user_id => users.id)
+#
+class FiatBalance < ApplicationRecord
+  belongs_to :user
+
+  monetize :amount_cents
+
+  validates :amount, presence: true
+end

app/models/user.rb

@@ -26,6 +26,7 @@ class User < ApplicationRecord
 
   has_many :documents, class_name: "UserDocument", dependent: :destroy
   has_many :balances, dependent: :restrict_with_error
+  has_one :fiat_balance, dependent: :restrict_with_error
 
   validates :first_name, :last_name, :email, presence: true
   validates :email, uniqueness: true

app/policies/fiat_balance_policy.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+class FiatBalancePolicy < ApplicationPolicy
+  class Scope < Scope
+    def resolve
+      return scope.none if user.nil?
+
+      scope.where(user_id: user.id)
+    end
+  end
+end

config/initializers/money.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+MoneyRails.configure do |config|
+  config.default_currency = :brl
+  config.rounding_mode = BigDecimal::ROUND_HALF_UP
+  config.locale_backend = :i18n
+end

db/migrate/20210812011039_create_fiat_balances.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+class CreateFiatBalances < ActiveRecord::Migration[6.1]
+  def change
+    create_table(:fiat_balances) do |t|
+      t.references(:user, null: false, foreign_key: true)
+      t.monetize(:amount)
+
+      t.timestamps
+    end
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2021_08_11_121726) do
+ActiveRecord::Schema.define(version: 2021_08_12_011039) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -71,6 +71,15 @@ ActiveRecord::Schema.define(version: 2021_08_11_121726) do
     t.datetime "updated_at", precision: 6, null: false
   end
 
+  create_table "fiat_balances", force: :cascade do |t|
+    t.bigint "user_id", null: false
+    t.integer "amount_cents", default: 0, null: false
+    t.string "amount_currency", default: "BRL", null: false
+    t.datetime "created_at", precision: 6, null: false
+    t.datetime "updated_at", precision: 6, null: false
+    t.index ["user_id"], name: "index_fiat_balances_on_user_id"
+  end
+
   create_table "user_documents", force: :cascade do |t|
     t.string "status", null: false
     t.bigint "user_id", null: false
@@ -97,5 +106,6 @@ ActiveRecord::Schema.define(version: 2021_08_11_121726) do
   add_foreign_key "active_storage_variant_records", "active_storage_blobs", column: "blob_id"
   add_foreign_key "balances", "currencies"
   add_foreign_key "balances", "users"
+  add_foreign_key "fiat_balances", "users"
   add_foreign_key "user_documents", "users"
 end

db/seeds.rb

@@ -214,3 +214,5 @@ currencies.each do |currency|
     amount: random_floating_number
   )
 end
+
+FiatBalance.create(user_id: user.id)

spec/models/fiat_balance_spec.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: fiat_balances
+#
+#  id              :bigint           not null, primary key
+#  amount_cents    :integer          default(0), not null
+#  amount_currency :string           default("BRL"), not null
+#  created_at      :datetime         not null
+#  updated_at      :datetime         not null
+#  user_id         :bigint           not null
+#
+# Indexes
+#
+#  index_fiat_balances_on_user_id  (user_id)
+#
+# Foreign Keys
+#
+#  fk_rails_...  (user_id => users.id)
+#
+require "rails_helper"
+
+RSpec.describe(FiatBalance, type: :model) do
+  pending "add some examples to (or delete) #{__FILE__}"
+end

spec/policies/fiat_balance_policy_spec.rb

@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+require "rails_helper"
+
+RSpec.describe(FiatBalancePolicy, type: :policy) do
+  pending "add some examples to (or delete) #{__FILE__}"
+end