Create model and controller

app/controllers/groups_controller.rb

@@ -0,0 +1,5 @@
+class GroupsController < ApplicationController
+  def index
+    render jsonapi: Group.all
+  end
+end

app/helpers/groups_helper.rb

@@ -0,0 +1,2 @@
+module GroupsHelper
+end

app/models/group.rb

@@ -0,0 +1,4 @@
+class Group < ApplicationRecord
+    validates :name, uniqueness: true
+    validates :name, :order, presence: true
+end

app/serializers/serializable_group.rb

@@ -0,0 +1,5 @@
+class SerializableGroup < JSONAPI::Serializable::Resource
+  type 'group'
+
+  attributes :name, :icon
+end

config/routes.rb

@@ -1,4 +1,5 @@
 Rails.application.routes.draw do
+  resources :groups, only: :index
   resources :guests do
     post :import, on: :collection
   end

db/migrate/20240811142121_create_groups.rb

@@ -0,0 +1,13 @@
+class CreateGroups < ActiveRecord::Migration[7.1]
+  def change
+    create_table :groups, id: :uuid do |t|
+      t.string :name, null: false
+      t.string :icon
+      t.integer :order, null: false, default: 1
+
+      t.timestamps
+    end
+
+    add_index :groups, :name, unique: true
+  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[7.1].define(version: 2024_07_24_181853) do
+ActiveRecord::Schema[7.1].define(version: 2024_08_11_142121) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
 
@@ -26,6 +26,15 @@ ActiveRecord::Schema[7.1].define(version: 2024_07_24_181853) do
     t.datetime "updated_at", null: false
   end
 
+  create_table "groups", id: :uuid, default: -> { "gen_random_uuid()" }, force: :cascade do |t|
+    t.string "name", null: false
+    t.string "icon"
+    t.integer "order", default: 1, null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["name"], name: "index_groups_on_name", unique: true
+  end
+
   create_table "guests", id: :uuid, default: -> { "gen_random_uuid()" }, force: :cascade do |t|
     t.string "first_name"
     t.string "last_name"

db/seeds.rb

@@ -5,6 +5,7 @@ Expense.delete_all
 Guest.delete_all
 ActsAsTaggableOn::Tagging.delete_all
 ActsAsTaggableOn::Tag.delete_all
+Group.delete_all
 
 Expense.create!(name: 'Photographer', amount: 3000, pricing_type: 'fixed')
 Expense.create!(name: 'Country house', amount: 6000, pricing_type: 'fixed')
@@ -43,6 +44,7 @@ samples = {
   football_team_a: 15,
   dance_club: 10
 }.each_with_object([]) do |(affinity_group, count), acc|
+  Group.find_or_create_by!(name: affinity_group.to_s.humanize)
   count.times { acc << affinity_group }
 end
 

spec/factories/groups.rb

@@ -0,0 +1,7 @@
+FactoryBot.define do
+  factory :group do
+    name { "MyString" }
+    icon { "MyString" }
+    order { 1 }
+  end
+end

spec/models/group_spec.rb

@@ -0,0 +1,5 @@
+require 'rails_helper'
+
+RSpec.describe Group, type: :model do
+  pending "add some examples to (or delete) #{__FILE__}"
+end