Merge pull request #7 from exstake/save-user-balances

Save user balances

app/controllers/admin/balances_controller.rb

@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+module Admin
+  class BalancesController < Admin::ApplicationController
+    def valid_action?(name, resource = resource_class)
+      ["destroy"].exclude?(name.to_s) && super
+    end
+  end
+end

app/controllers/admin/currencies_controller.rb

@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+module Admin
+  class CurrenciesController < Admin::ApplicationController
+    def valid_action?(name, resource = resource_class)
+      ["new", "edit", "destroy"].exclude?(name.to_s) && super
+    end
+  end
+end

app/controllers/application_controller.rb

@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 class ApplicationController < ActionController::Base
-  include Pundit
-
   before_action :configure_devise_permitted_parameters, if: :devise_controller?
 
   protected

app/controllers/graphql_controller.rb

@@ -1,5 +1,7 @@
 # frozen_string_literal: true
 class GraphqlController < ApplicationController
+  # protect_from_forgery with: :null_session
+
   def execute
     variables = prepare_variables(params[:variables])
     query = params[:query]

app/dashboards/balance_dashboard.rb

@@ -0,0 +1,54 @@
+# frozen_string_literal: true
+require "administrate/base_dashboard"
+
+class BalanceDashboard < Administrate::BaseDashboard
+  # ATTRIBUTE_TYPES
+  # a hash that describes the type of each of the model's fields.
+  #
+  # Each different type represents an Administrate::Field object,
+  # which determines how the attribute is displayed
+  # on pages throughout the dashboard.
+  ATTRIBUTE_TYPES = {
+    user: Field::BelongsTo,
+    currency: Field::BelongsTo,
+    id: Field::Number,
+    amount: Field::String.with_options(searchable: false),
+    created_at: Field::DateTime,
+    updated_at: Field::DateTime,
+  }.freeze
+
+  # COLLECTION_ATTRIBUTES
+  # an array of attributes that will be displayed on the model's index page.
+  #
+  # By default, it's limited to four items to reduce clutter on index pages.
+  # Feel free to add, remove, or rearrange items.
+  COLLECTION_ATTRIBUTES = [:user, :currency, :id, :amount].freeze
+
+  # SHOW_PAGE_ATTRIBUTES
+  # an array of attributes that will be displayed on the model's show page.
+  SHOW_PAGE_ATTRIBUTES = [:user, :currency, :id, :amount, :created_at, :updated_at].freeze
+
+  # FORM_ATTRIBUTES
+  # an array of attributes that will be displayed
+  # on the model's form (`new` and `edit`) pages.
+  FORM_ATTRIBUTES = [:user, :currency, :amount].freeze
+
+  # COLLECTION_FILTERS
+  # a hash that defines filters that can be used while searching via the search
+  # field of the dashboard.
+  #
+  # For example to add an option to search for open resources by typing "open:"
+  # in the search field:
+  #
+  #   COLLECTION_FILTERS = {
+  #     open: ->(resources) { resources.where(open: true) }
+  #   }.freeze
+  COLLECTION_FILTERS = {}.freeze
+
+  # Overwrite this method to customize how balances are displayed
+  # across all pages of the admin dashboard.
+  #
+  # def display_resource(balance)
+  #   "Balance ##{balance.id}"
+  # end
+end

app/dashboards/currency_dashboard.rb

@@ -0,0 +1,52 @@
+# frozen_string_literal: true
+require "administrate/base_dashboard"
+
+class CurrencyDashboard < Administrate::BaseDashboard
+  # ATTRIBUTE_TYPES
+  # a hash that describes the type of each of the model's fields.
+  #
+  # Each different type represents an Administrate::Field object,
+  # which determines how the attribute is displayed
+  # on pages throughout the dashboard.
+  ATTRIBUTE_TYPES = {
+    id: Field::Number,
+    name: Field::String,
+    created_at: Field::DateTime,
+    updated_at: Field::DateTime,
+  }.freeze
+
+  # COLLECTION_ATTRIBUTES
+  # an array of attributes that will be displayed on the model's index page.
+  #
+  # By default, it's limited to four items to reduce clutter on index pages.
+  # Feel free to add, remove, or rearrange items.
+  COLLECTION_ATTRIBUTES = [:id, :name, :created_at, :updated_at].freeze
+
+  # SHOW_PAGE_ATTRIBUTES
+  # an array of attributes that will be displayed on the model's show page.
+  SHOW_PAGE_ATTRIBUTES = [:id, :name, :created_at, :updated_at].freeze
+
+  # FORM_ATTRIBUTES
+  # an array of attributes that will be displayed
+  # on the model's form (`new` and `edit`) pages.
+  FORM_ATTRIBUTES = [:name].freeze
+
+  # COLLECTION_FILTERS
+  # a hash that defines filters that can be used while searching via the search
+  # field of the dashboard.
+  #
+  # For example to add an option to search for open resources by typing "open:"
+  # in the search field:
+  #
+  #   COLLECTION_FILTERS = {
+  #     open: ->(resources) { resources.where(open: true) }
+  #   }.freeze
+  COLLECTION_FILTERS = {}.freeze
+
+  # Overwrite this method to customize how currencies are displayed
+  # across all pages of the admin dashboard.
+  #
+  def display_resource(currency)
+    currency.name
+  end
+end

app/graphql/types/balance_type.rb

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+module Types
+  class BalanceType < Types::BaseObject
+    implements GraphQL::Types::Relay::Node
+    global_id_field :id
+
+    graphql_name "Balance"
+
+    field :id, ID, null: false
+    field :currency, CurrencyType, null: false
+    field :amount, String, null: false
+  end
+end

app/graphql/types/currency_type.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+module Types
+  class CurrencyType < Types::BaseObject
+    implements GraphQL::Types::Relay::Node
+    global_id_field :id
+
+    graphql_name "Currency"
+
+    field :id, ID, null: false
+    field :name, String, null: false
+  end
+end

app/graphql/types/query_type.rb

@@ -8,5 +8,10 @@ module Types
     def current_user
       context[:current_user]
     end
+
+    field :balances, BalanceType.connection_type, null: false
+    def balances
+      Pundit.policy_scope(current_user, Balance)
+    end
   end
 end

app/graphql/types/user_type.rb

@@ -2,9 +2,10 @@
 module Types
   class UserType < Types::BaseObject
     # implements GraphQL::Types::Relay::Node
-
     global_id_field :id
 
+    graphql_name "User"
+
     field :id, ID, null: false
     field :first_name, String, null: false
     field :last_name, String, null: false

app/graphql/x_stake_schema.rb

@@ -4,15 +4,22 @@ class XStakeSchema < GraphQL::Schema
   query(Types::QueryType)
 
   def self.resolve_type(abstract_type, obj, ctx)
-    raise(GraphQL::RequiredImplementationMissingError)
+    case obj
+    when Currency
+      Types::CurrencyType
+    when Balance
+      Types::BalanceType
+    else
+      raise(GraphQL::RequiredImplementationMissingError, "Unexpected object: #{obj}")
+    end
   end
 
-  def self.id_from_object(object, type_definition, query_ctx)
+  def self.id_from_object(object, type_definition, ctx)
     GraphQL::Schema::UniqueWithinType.encode(type_definition.name, object.id)
   end
 
-  def self.object_from_id(id, query_ctx)
+  def self.object_from_id(id, ctx)
     type_name, item_id = GraphQL::Schema::UniqueWithinType.decode(id)
-    type_name.constantize.find(item_id)
+    Pundit.policy_scope(ctx[:current_user], type_name.constantize).find(item_id)
   end
 end

app/javascript/__generated__/schema.graphql

@@ -1,5 +1,127 @@
+type Balance implements Node {
+  amount: Float!
+  currency: Currency!
+  id: ID!
+}
+
+"""
+The connection type for Balance.
+"""
+type BalanceConnection {
+  """
+  A list of edges.
+  """
+  edges: [BalanceEdge]
+
+  """
+  A list of nodes.
+  """
+  nodes: [Balance]
+
+  """
+  Information to aid in pagination.
+  """
+  pageInfo: PageInfo!
+}
+
+"""
+An edge in a connection.
+"""
+type BalanceEdge {
+  """
+  A cursor for use in pagination.
+  """
+  cursor: String!
+
+  """
+  The item at the end of the edge.
+  """
+  node: Balance
+}
+
+type Currency implements Node {
+  id: ID!
+  name: String!
+}
+
+"""
+An object with an ID.
+"""
+interface Node {
+  """
+  ID of the object.
+  """
+  id: ID!
+}
+
+"""
+Information about pagination in a connection.
+"""
+type PageInfo {
+  """
+  When paginating forwards, the cursor to continue.
+  """
+  endCursor: String
+
+  """
+  When paginating forwards, are there more items?
+  """
+  hasNextPage: Boolean!
+
+  """
+  When paginating backwards, are there more items?
+  """
+  hasPreviousPage: Boolean!
+
+  """
+  When paginating backwards, the cursor to continue.
+  """
+  startCursor: String
+}
+
 type Query {
+  balances(
+    """
+    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
+  ): BalanceConnection!
   currentUser: User
+
+  """
+  Fetches an object given its ID.
+  """
+  node(
+    """
+    ID of the object.
+    """
+    id: ID!
+  ): Node
+
+  """
+  Fetches a list of objects given a list of IDs.
+  """
+  nodes(
+    """
+    IDs of the objects.
+    """
+    ids: [ID!]!
+  ): [Node]!
 }
 
 type User {

app/javascript/src/Routes.tsx

@@ -2,14 +2,17 @@ import type { FC } from "react";
 import React from "react";
 import { Switch, Route } from "react-router-dom";
 
-import { Home } from "./pages";
+import { Home, Wallet } from "./pages";
 
 export const Routes: FC = () => {
   return (
     <Switch>
-      <Route path="/">
+      <Route exact path="/">
         <Home />
       </Route>
+      <Route exact path="/wallet">
+        <Wallet />
+      </Route>
     </Switch>
   );
 };

app/javascript/src/components/SideNav.tsx

@@ -14,10 +14,6 @@ const MenuItems: MenuItem[] = [
     label: "Início",
     path: "/",
   },
-  {
-    label: "Stake",
-    path: "/stake",
-  },
   {
     label: "Carteira",
     path: "/wallet",

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

@@ -0,0 +1,94 @@
+import { graphql } from "babel-plugin-relay/macro";
+import type { FC } from "react";
+import React from "react";
+import { useLazyLoadQuery } from "react-relay";
+
+import { tokens } from "../../constants/pancake/Tokens";
+import type { WalletQuery } from "./__generated__/WalletQuery.graphql";
+
+export const Wallet: FC = () => {
+  const { balances } = useLazyLoadQuery<WalletQuery>(
+    graphql`
+      query WalletQuery {
+        balances {
+          nodes {
+            id
+            amount
+            currency {
+              name
+            }
+          }
+        }
+      }
+    `,
+    {}
+  );
+
+  const tokensList = Object.values(tokens);
+
+  return (
+    <div className="flex flex-col h-full w-full overflow-x-hidden mt-16">
+      <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">
+            <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>
+                  {balances.nodes?.map((balance) => {
+                    const token = tokensList.find(
+                      ({ symbol }) => symbol === balance?.currency.name
+                    );
+
+                    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">
+                              <a href="/" className="block relative">
+                                <img
+                                  alt="profil"
+                                  src={`https://pancakeswap.finance/images/tokens/${token?.address["56"]}.svg`}
+                                  className="mx-auto object-cover rounded-full h-10 w-10 "
+                                />
+                              </a>
+                            </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__/WalletQuery.graphql.ts

@@ -0,0 +1,165 @@
+/* tslint:disable */
+/* eslint-disable */
+// @ts-nocheck
+
+import { ConcreteRequest } from "relay-runtime";
+export type WalletQueryVariables = {};
+export type WalletQueryResponse = {
+    readonly balances: {
+        readonly nodes: ReadonlyArray<{
+            readonly id: string;
+            readonly amount: number;
+            readonly currency: {
+                readonly name: string;
+            };
+        } | null> | null;
+    };
+};
+export type WalletQuery = {
+    readonly response: WalletQueryResponse;
+    readonly variables: WalletQueryVariables;
+};
+
+
+
+/*
+query WalletQuery {
+  balances {
+    nodes {
+      id
+      amount
+      currency {
+        name
+        id
+      }
+    }
+  }
+}
+*/
+
+const node: ConcreteRequest = (function(){
+var v0 = {
+  "alias": null,
+  "args": null,
+  "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": {
+    "argumentDefinitions": [],
+    "kind": "Fragment",
+    "metadata": null,
+    "name": "WalletQuery",
+    "selections": [
+      {
+        "alias": null,
+        "args": null,
+        "concreteType": "BalanceConnection",
+        "kind": "LinkedField",
+        "name": "balances",
+        "plural": false,
+        "selections": [
+          {
+            "alias": null,
+            "args": null,
+            "concreteType": "Balance",
+            "kind": "LinkedField",
+            "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
+      }
+    ],
+    "type": "Query",
+    "abstractKey": null
+  },
+  "kind": "Request",
+  "operation": {
+    "argumentDefinitions": [],
+    "kind": "Operation",
+    "name": "WalletQuery",
+    "selections": [
+      {
+        "alias": null,
+        "args": null,
+        "concreteType": "BalanceConnection",
+        "kind": "LinkedField",
+        "name": "balances",
+        "plural": false,
+        "selections": [
+          {
+            "alias": null,
+            "args": null,
+            "concreteType": "Balance",
+            "kind": "LinkedField",
+            "name": "nodes",
+            "plural": true,
+            "selections": [
+              (v0/*: any*/),
+              (v1/*: any*/),
+              {
+                "alias": null,
+                "args": null,
+                "concreteType": "Currency",
+                "kind": "LinkedField",
+                "name": "currency",
+                "plural": false,
+                "selections": [
+                  (v2/*: any*/),
+                  (v0/*: any*/)
+                ],
+                "storageKey": null
+              }
+            ],
+            "storageKey": null
+          }
+        ],
+        "storageKey": null
+      }
+    ]
+  },
+  "params": {
+    "cacheID": "6b8d0c664bd2d9df4d323c19c4a823a5",
+    "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"
+  }
+};
+})();
+(node as any).hash = '428f4f1ab769f9056dd38ec641a30733';
+export default node;

app/javascript/src/pages/Wallet/index.ts

@@ -0,0 +1 @@
+export * from "./Wallet";

app/javascript/src/pages/index.ts

@@ -1 +1,2 @@
 export * from "./Home";
+export * from "./Wallet";

app/javascript/src/pages/index.tsx

@@ -1 +0,0 @@
-export * from "./Home";

app/models/balance.rb

@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# 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
+#
+# Indexes
+#
+#  index_balances_on_currency_id  (currency_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
+  belongs_to :user
+  belongs_to :currency
+
+  validates :amount, presence: true
+end

app/models/currency.rb

@@ -0,0 +1,14 @@
+# 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/user.rb

@@ -25,6 +25,7 @@ class User < ApplicationRecord
     :recoverable, :rememberable, :validatable
 
   has_many :documents, class_name: "UserDocument", dependent: :destroy
+  has_many :balances, dependent: :restrict_with_error
 
   validates :first_name, :last_name, :email, presence: true
   validates :email, uniqueness: true

app/policies/balance_policy.rb

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

config/locales/activerecord.yml

@@ -5,9 +5,16 @@ pt-BR:
         one: Documentos de Usuário
         other: Documentos de Usuários
       admin_user:
-        one: Usuário Administrador
-        other: Usuários Administradores
+        one: Administrador
+        other: Administradores
+      currency:
+        one: Moeda
+        other: Moedas
+      balance:
+        one: Saldo
+        other: Saldos
     attributes:
       user:
         first_name: Primeiro nome
         last_name: Último nome
+        full_name: Nome completo

config/routes.rb

@@ -5,7 +5,8 @@ Rails.application.routes.draw do
 
   namespace :admin do
     resources :users
-    resources :user_documents
+    resources :balances
+    resources :currencies
     resources :admin_users
 
     root to: "users#index"

db/migrate/20210811014107_create_currencies.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+class CreateCurrencies < ActiveRecord::Migration[6.1]
+  def change
+    create_table(:currencies) do |t|
+      t.string(:name, null: false)
+
+      t.timestamps
+    end
+  end
+end

db/migrate/20210811121726_create_balances.rb

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+class CreateBalances < ActiveRecord::Migration[6.1]
+  def change
+    create_table(:balances) do |t|
+      t.references(:user, null: false, foreign_key: true)
+      t.references(:currency, null: false, foreign_key: true)
+
+      t.decimal(:amount, precision: 20, scale: 10, null: false, default: 0)
+
+      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_08_153626) do
+ActiveRecord::Schema.define(version: 2021_08_11_121726) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -55,6 +55,22 @@ ActiveRecord::Schema.define(version: 2021_08_08_153626) do
     t.index ["reset_password_token"], name: "index_admin_users_on_reset_password_token", unique: true
   end
 
+  create_table "balances", force: :cascade do |t|
+    t.bigint "user_id", null: false
+    t.bigint "currency_id", null: false
+    t.decimal "amount", precision: 20, scale: 10, default: "0.0", null: false
+    t.datetime "created_at", precision: 6, null: false
+    t.datetime "updated_at", precision: 6, null: false
+    t.index ["currency_id"], name: "index_balances_on_currency_id"
+    t.index ["user_id"], name: "index_balances_on_user_id"
+  end
+
+  create_table "currencies", force: :cascade do |t|
+    t.string "name", null: false
+    t.datetime "created_at", precision: 6, null: false
+    t.datetime "updated_at", precision: 6, null: false
+  end
+
   create_table "user_documents", force: :cascade do |t|
     t.string "status", null: false
     t.bigint "user_id", null: false
@@ -79,5 +95,7 @@ ActiveRecord::Schema.define(version: 2021_08_08_153626) do
 
   add_foreign_key "active_storage_attachments", "active_storage_blobs", column: "blob_id"
   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 "user_documents", "users"
 end

db/seeds.rb

@@ -1,8 +1,216 @@
 # frozen_string_literal: true
-# This file should contain all the record creation needed to seed the database with its default values.
-# The data can then be loaded with the bin/rails db:seed command (or created alongside the database with db:setup).
-#
-# Examples:
-#
-#   movies = Movie.create([{ name: 'Star Wars' }, { name: 'Lord of the Rings' }])
-#   Character.create(name: 'Luke', movie: movies.first)
+
+AdminUser.create(email: "admin@example.com", password: "password")
+
+user = User.create!(
+  first_name: "Test",
+  last_name: "User",
+  email: "user@example.com",
+  password: "password"
+)
+
+tokens = [
+  "BNB",
+  "CAKE",
+  "CHESS",
+  "TITAN",
+  "ONE",
+  "MASK",
+  "DVI",
+  "ADX",
+  "BSCPAD",
+  "RABBIT",
+  "FORM",
+  "TXL",
+  "ORBS",
+  "COS",
+  "BUNNY",
+  "ALICE",
+  "FOR",
+  "BUX",
+  "NULS",
+  "BELT",
+  "RAMP",
+  "BFI",
+  "DEXE",
+  "BEL",
+  "TPT",
+  "WATCH",
+  "xMARK",
+  "bMXX",
+  "IOTX",
+  "BOR",
+  "bOPEN",
+  "DODO",
+  "SWINGBY",
+  "BRY",
+  "ZEE",
+  "SWGb",
+  "SWG",
+  "SFP",
+  "LINA",
+  "LIT",
+  "HGET",
+  "BDO",
+  "EGLD",
+  "UST",
+  "wSOTE",
+  "FRONT",
+  "Helmet",
+  "BTCST",
+  "BSCX",
+  "TEN",
+  "bALBT",
+  "ASR",
+  "ATM",
+  "OG",
+  "REEF",
+  "DITTO",
+  "JUV",
+  "PSG",
+  "VAI",
+  "wBNB",
+  "BLINK",
+  "UNFI",
+  "TWT",
+  "HARD",
+  "bROOBEE",
+  "STAX",
+  "NAR",
+  "NYA",
+  "CTK",
+  "INJ",
+  "SXP",
+  "ALPHA",
+  "XVS",
+  "SUSHI",
+  "COMP",
+  "SYRUP",
+  "BIFI",
+  "DUSK",
+  "BUSD",
+  "ETH",
+  "BETH",
+  "mAMZN",
+  "mGOOGL",
+  "mNFLX",
+  "mTSLA",
+  "LTC",
+  "USDC",
+  "DAI",
+  "ADA",
+  "BAND",
+  "DOT",
+  "EOS",
+  "LINK",
+  "USDT",
+  "BTCB",
+  "XRP",
+  "ATOM",
+  "YFII",
+  "XTZ",
+  "BCH",
+  "YFI",
+  "UNI",
+  "FIL",
+  "BAKE",
+  "BURGER",
+  "bDIGG",
+  "bBadger",
+  "TRADE",
+  "PNT",
+  "MIR",
+  "pBTC",
+  "LTO",
+  "pCWS",
+  "ZIL",
+  "LIEN",
+  "SWTH",
+  "DFT",
+  "GUM",
+  "DEGO",
+  "NRV",
+  "EASY",
+  "ODDZ",
+  "HOO",
+  "APYS",
+  "BONDLY",
+  "TKO",
+  "ITAM",
+  "ARPA",
+  "EPS",
+  "JGN",
+  "TLM",
+  "PERL",
+  "ALPA",
+  "HZN",
+  "SUTER",
+  "CGG",
+  "MIX",
+  "HAKKA",
+  "XED",
+  "τBTC",
+  "ALPACA",
+  "DFD",
+  "LMT",
+  "BTT",
+  "TRX",
+  "WIN",
+  "mCOIN",
+  "MATH",
+  "KUN",
+  "QSD",
+  "HYFI",
+  "OIN",
+  "DOGE",
+  "FINE",
+  "ONE",
+  "PMON",
+  "HOTCROSS",
+  "τDOGE",
+  "BTR",
+  "UBXT",
+  "WMASS",
+  "RFOX",
+  "XEND",
+  "CYC",
+  "CHR",
+  "KALM",
+  "DERI",
+  "WELL",
+  "WEX",
+  "WAULTx",
+  "pOPEN",
+  "EZ",
+  "VRT",
+  "TUSD",
+  "MTRG",
+  "KTN",
+  "QKC",
+  "bCFX",
+  "MX",
+  "ATA",
+  "MBOX",
+  "BORING",
+  "MARSH",
+  "AMPL",
+  "O3",
+  "HAI",
+  "HTB",
+  "WOO",
+  "$DG",
+]
+
+currencies = tokens.map do |token|
+  Currency.create!(name: token)
+end
+
+currencies.each do |currency|
+  random_floating_number = (rand * (10000 - 0) + 0)
+
+  Balance.create!(
+    user_id: user.id,
+    currency_id: currency.id,
+    amount: random_floating_number
+  )
+end

spec/models/balance_spec.rb

@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# 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
+#
+# Indexes
+#
+#  index_balances_on_currency_id  (currency_id)
+#  index_balances_on_user_id      (user_id)
+#
+# Foreign Keys
+#
+#  fk_rails_...  (currency_id => currencies.id)
+#  fk_rails_...  (user_id => users.id)
+#
+require "rails_helper"
+
+RSpec.describe(Balance, type: :model) do
+  describe "validations" do
+    it { is_expected.to(validate_presence_of(:amount)) }
+  end
+
+  describe "associations" do
+    it { is_expected.to(belong_to(:user)) }
+    it { is_expected.to(belong_to(:currency)) }
+  end
+end

spec/models/currency_spec.rb

@@ -0,0 +1,18 @@
+# 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
+#
+require "rails_helper"
+
+RSpec.describe(Currency, type: :model) do
+  describe "validations" do
+    it { is_expected.to(validate_presence_of(:name)) }
+  end
+end

spec/models/user_spec.rb

@@ -31,5 +31,6 @@ RSpec.describe(User, type: :model) do
 
   describe "associations" do
     it { is_expected.to(have_many(:documents)) }
+    it { is_expected.to(have_many(:balances)) }
   end
 end

spec/policies/balance_policy_spec.rb

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