add currency entity

app/controllers/admin/currencies_controller.rb

@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+module Admin
+  class CurrenciesController < Admin::ApplicationController
+  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 ##{currency.id}"
+  # end
+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

config/routes.rb

@@ -6,6 +6,7 @@ Rails.application.routes.draw do
   namespace :admin do
     resources :users
     resources :user_documents
+    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/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_014107) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -55,6 +55,12 @@ 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 "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

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