Add: Expense show view

app/controllers/expenses_controller.rb

@@ -0,0 +1,31 @@
+class ExpensesController < ApplicationController
+  def show
+    @group = Group.find(params[:group_id])
+    @users = @group.users
+    @difference = Expense.new.split_expenses(@users)
+  end
+
+  def edit
+    @group = Group.find(params[:group_id])
+    @users = @group.users
+  end
+
+  def update
+    @group = Group.find(params[:group_id])
+    @users = @group.users
+
+    @users.each do |user|
+      expense = user.expense
+      amount = params["group_user_#{user.id}_expenses"].to_i
+      expense.update(amount: amount) if expense
+    end
+
+    redirect_to expense_path(@group)
+  end
+
+  private
+
+  def expense_params
+    params.require(:expense).permit(:amount, :group_id, :user_id)
+  end
+end

app/models/expense.rb

@@ -1,4 +1,18 @@
 class Expense < ApplicationRecord
   belongs_to :user
   belongs_to :group
+
+  def split_expenses(users)
+    total_amount = users.sum { |user| user.expense&.amount.to_i }
+    num_users = users.size
+    per_person_amount = total_amount / num_users
+
+    differences = users.map do |user|
+      paid_amount = user.expense&.amount.to_i
+      difference = per_person_amount - paid_amount
+      { user: user, difference: difference }
+    end
+
+    return differences
+  end
 end

app/models/user.rb

@@ -8,6 +8,5 @@ class User < ApplicationRecord
   end
   has_many :group_members, dependent: :destroy
   has_many :groups, through: :group_members
-
-  has_many :expenses, dependent: :destroy
+  has_one :expense, dependent: :destroy
 end

app/views/expenses/edit.html.erb

@@ -0,0 +1,30 @@
+<div class="mb-6 text-center">
+  <span class="text-3xl font-bold">
+    Edit Amount
+  </span>
+</div>
+
+<div class='flex flex-wrap justify-center'>
+  <%= form_with model: @group, url: group_expenses_path(@group), local: true, class: "xl:w-8/12 md:w-10/12", data: { turbo: false }, readonly: true  do |f| %>
+    <%= render "user/shared/error_messages", resource: @group %>
+    <div class="mb-6">
+      <%= label_tag :name, "Name", class: "mb-2 block text-sm text-gray-600" %>
+      <span class="text-gray-600">
+        <%= @group.name %>
+      </span>
+    </div>
+
+    <div class="mb-6">
+      <%= label_tag :user_lists, "Member", class: "mb-2 block text-sm text-gray-600" %>
+      <span class="text-gray-600">
+        <% @users.each do |user| %>
+          <%= user.name %>
+          <%= f.text_field :expenses, name: "group_user_#{user.id}_expenses", value: user.expense&.amount.to_i, class: "block w-full mt-1 rounded-md shadow-sm border-gray-300 focus:border-indigo-500 focus:ring focus:ring-indigo-200 focus:ring-opacity-50" %>
+          円  <br>
+        <% end %>
+      </span>
+    </div>
+
+    <%= link_to "Update", group_expenses_path(@group), class: "inline-flex w-full items-center justify-center rounded-md bg-indigo-500 p-3 text-white duration-100 ease-in-out hover:bg-indigo-600 focus:outline-none cursor-pointer", method: :put %>
+  <% end %>
+</div>

app/views/expenses/show.html.erb

@@ -0,0 +1,42 @@
+<div class="mb-6 text-center">
+  <span class="text-3xl font-bold">
+    Show Amount
+  </span>
+</div>
+
+<div class='flex flex-wrap justify-center'>
+  <%= form_with model: @group, url: group_path(@group), local: true, class: "xl:w-8/12 md:w-10/12", data: { turbo: false }, readonly: true  do |f| %>
+    <%= render "user/shared/error_messages", resource: @group %>
+    <div class="mb-6">
+      <%= label_tag :name, "Name", class: "mb-2 block text-sm text-gray-600" %>
+      <span class="text-gray-600">
+        <%= @group.name %>
+      </span>
+    </div>
+
+    <div class="mb-6">
+      <%= label_tag :user_lists, "Member", class: "mb-2 block text-sm text-gray-600" %>
+      <span class="text-gray-600">
+        <% @users.each do |user| %>
+          <%= user.name %>
+          <% if user.expense %>
+            <%= user.expense.amount %> 円  <br>
+          <% else %>
+            0 円  <br>
+          <% end %>
+        <% end %>
+      </span>
+    </div>
+
+    <div class="mb-6">
+      <%= label_tag :differences, "differences", class: "mb-2 block text-sm text-gray-600" %>
+      <ul>
+        <% @difference.each do |hash| %>
+          <li><%= hash[:user].name %> : <%= hash[:difference] %> 円</li>
+        <% end %>
+      </ul>
+    </div>
+
+    <%= link_to "Edit", edit_group_expenses_path(@group), class: "inline-flex w-full items-center justify-center rounded-md bg-indigo-500 p-3 text-white duration-100 ease-in-out hover:bg-indigo-600 focus:outline-none cursor-pointer" %>
+  <% end %>
+</div>

config/routes.rb

@@ -4,7 +4,9 @@
     registrations: 'user/registrations'
   }
   root to: 'pages#home'
-  resources :groups, only: %i[index new create show edit update]
+  resources :groups, only: %i[index new create show edit update] do
+    resource :expenses, only: %i[show edit update]
+  end
 
   get '/up/', to: 'up#index', as: :up
   get '/up/databases', to: 'up#databases', as: :up_databases