diff --git a/app/controllers/affinities_controller.rb b/app/controllers/affinities_controller.rb
index fab690a..f8b7052 100644
--- a/app/controllers/affinities_controller.rb
+++ b/app/controllers/affinities_controller.rb
@@ -6,22 +6,27 @@ class AffinitiesController < ApplicationController
   before_action :set_group
 
   def index
-    overridden_affinities = @group.affinities
-      .each_with_object({}) { |affinity, acc| acc[affinity.another_group(@group).id] = affinity.discomfort }
-    Group.where.not(id: @group.id).pluck(:id).index_with { |group_id| GroupAffinity::MAX_DISCOMFORT - (overridden_affinities[group_id] || GroupAffinity::NEUTRAL) }
-      .then { |affinities| render json: affinities }
+    overridden = @group.affinities.each_with_object({}) do |affinity, acc|
+      acc[affinity.another_group(@group).id] = affinity.discomfort
+    end
+    Group.where.not(id: @group.id)
+         .pluck(:id)
+         .index_with { |group_id| GroupAffinity::MAX_DISCOMFORT - (overridden[group_id] || GroupAffinity::NEUTRAL) }
+         .then { |affinities| render json: affinities }
   end
 
   def bulk_update
-    params.expect(affinities: [[:group_id, :affinity]]).map(&:to_h).map do |affinity|
+    affinities = params.expect(affinities: [%i[group_id affinity]]).map(&:to_h).map do |affinity|
       {
         group_a_id: @group.id,
         group_b_id: affinity[:group_id],
         discomfort: GroupAffinity::MAX_DISCOMFORT - affinity[:affinity]
       }
-    end.then { |affinities| GroupAffinity.upsert_all(affinities) }
-    render json: {}, status: :ok
+    end
 
+    GroupAffinity.upsert_all(affinities)
+
+    render json: {}, status: :ok
   rescue ActiveRecord::InvalidForeignKey
     render json: { error: 'At least one of the group IDs provided does not exist.' }, status: :bad_request
   rescue ActiveRecord::StatementInvalid
diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index 7cb39a8..e1bebb9 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Copyright (C) 2024 Manuel Bustillo
 
 class ApplicationController < ActionController::Base
@@ -40,9 +42,9 @@ class ApplicationController < ActionController::Base
   end
 
   def captcha_params
-    params.expect(captcha: [:id, :answer])
+    params.expect(captcha: %i[id answer])
   end
-  
+
   def default_url_options(options = {})
     options.merge(path_params: { slug: ActsAsTenant.current_tenant&.slug })
   end
@@ -53,7 +55,7 @@ class ApplicationController < ActionController::Base
 
   def development_swagger?
     Rails.env.test? ||
-      Rails.env.development? && request.headers['referer']&.include?('/api-docs/index.html')
+      (Rails.env.development? && request.headers['referer']&.include?('/api-docs/index.html'))
   end
 
   def set_csrf_cookie
diff --git a/app/controllers/expenses_controller.rb b/app/controllers/expenses_controller.rb
index 2a125d9..0b86498 100644
--- a/app/controllers/expenses_controller.rb
+++ b/app/controllers/expenses_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Copyright (C) 2024 Manuel Bustillo
 
 class ExpensesController < ApplicationController
@@ -6,7 +8,7 @@ class ExpensesController < ApplicationController
   end
 
   def index
-    render json: Expense.all.order(pricing_type: :asc, amount: :desc).as_json(only: %i[id name amount pricing_type])
+    render json: Expense.order(pricing_type: :asc, amount: :desc).as_json(only: %i[id name amount pricing_type])
   end
 
   def create
diff --git a/app/controllers/groups_controller.rb b/app/controllers/groups_controller.rb
index f53ed35..6ba61ca 100644
--- a/app/controllers/groups_controller.rb
+++ b/app/controllers/groups_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Copyright (C) 2024 Manuel Bustillo
 
 class GroupsController < ApplicationController
@@ -39,6 +41,6 @@ class GroupsController < ApplicationController
   end
 
   def group_params
-    params.expect(group: [:name, :icon, :color])
+    params.expect(group: %i[name icon color])
   end
 end
diff --git a/app/controllers/guests_controller.rb b/app/controllers/guests_controller.rb
index 54975b6..e8b1cd0 100644
--- a/app/controllers/guests_controller.rb
+++ b/app/controllers/guests_controller.rb
@@ -1,10 +1,12 @@
+# frozen_string_literal: true
+
 # Copyright (C) 2024 Manuel Bustillo
 
 require 'csv'
 
 class GuestsController < ApplicationController
   def index
-    render json: Guest.all.includes(:group)
+    render json: Guest.includes(:group)
                       .left_joins(:group)
                       .order('groups.name' => :asc, name: :asc)
                       .as_json(only: %i[id name status], include: { group: { only: %i[id name] } })
diff --git a/app/controllers/summary_controller.rb b/app/controllers/summary_controller.rb
index 55983dc..0959d4d 100644
--- a/app/controllers/summary_controller.rb
+++ b/app/controllers/summary_controller.rb
@@ -1,29 +1,43 @@
+# frozen_string_literal: true
+
 # Copyright (C) 2024 Manuel Bustillo
 
 class SummaryController < ApplicationController
   def index
-    expense_summary = Expenses::TotalQuery.new(wedding: ActsAsTenant.current_tenant).call
-    guest_summary = Guest.group(:status).count
     render json: {
-      expenses: {
-        projected: {
-          total: expense_summary['total_projected'],
-          guests: expense_summary['projected_guests']
-        },
-        confirmed: {
-          total: expense_summary['total_confirmed'],
-          guests: expense_summary['confirmed_guests']
-        },
-        status: {
-          paid: 0
-        }
+      expenses:,
+      guests:
+    }
+  end
+
+  private
+
+  def guests
+    guest_summary = Guest.group(:status).count
+
+    {
+      total: guest_summary.except('considered').values.sum,
+      confirmed: guest_summary['confirmed'].to_i,
+      declined: guest_summary['declined'].to_i,
+      tentative: guest_summary['tentative'].to_i,
+      invited: guest_summary['invited'].to_i
+    }
+  end
+
+  def expenses
+    expense_summary = Expenses::TotalQuery.new(wedding: ActsAsTenant.current_tenant).call
+
+    {
+      projected: {
+        total: expense_summary['total_projected'],
+        guests: expense_summary['projected_guests']
       },
-      guests: {
-        total: guest_summary.except('considered').values.sum,
-        confirmed: guest_summary['confirmed'].to_i,
-        declined: guest_summary['declined'].to_i,
-        tentative: guest_summary['tentative'].to_i,
-        invited: guest_summary['invited'].to_i
+      confirmed: {
+        total: expense_summary['total_confirmed'],
+        guests: expense_summary['confirmed_guests']
+      },
+      status: {
+        paid: 0
       }
     }
   end
diff --git a/app/controllers/tables_arrangements_controller.rb b/app/controllers/tables_arrangements_controller.rb
index 00ba8b1..c042b6c 100644
--- a/app/controllers/tables_arrangements_controller.rb
+++ b/app/controllers/tables_arrangements_controller.rb
@@ -1,8 +1,10 @@
+# frozen_string_literal: true
+
 # Copyright (C) 2024 Manuel Bustillo
 
 class TablesArrangementsController < ApplicationController
   def index
-    render json: TablesArrangement.all.order(discomfort: :asc).limit(3).as_json(only: %i[id name discomfort])
+    render json: TablesArrangement.order(discomfort: :asc).limit(3).as_json(only: %i[id name discomfort])
   end
 
   def show
diff --git a/app/controllers/tokens_controller.rb b/app/controllers/tokens_controller.rb
index c3dabba..58cf243 100644
--- a/app/controllers/tokens_controller.rb
+++ b/app/controllers/tokens_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Copyright (C) 2024 Manuel Bustillo
 
 class TokensController < ApplicationController
diff --git a/app/controllers/users/confirmations_controller.rb b/app/controllers/users/confirmations_controller.rb
index 660d263..d073fef 100644
--- a/app/controllers/users/confirmations_controller.rb
+++ b/app/controllers/users/confirmations_controller.rb
@@ -1,23 +1,27 @@
+# frozen_string_literal: true
+
 # Copyright (C) 2024 Manuel Bustillo
 
-class Users::ConfirmationsController < Devise::ConfirmationsController
-  clear_respond_to
-  respond_to :json
+module Users
+  class ConfirmationsController < Devise::ConfirmationsController
+    clear_respond_to
+    respond_to :json
 
-  def show
-    super do |resource|
-      if resource.errors.empty?
-        respond_to do |format|  
-          format.json { render json: resource, status: :ok }
-          format.any { redirect_to root_path }
+    def show
+      super do |resource|
+        if resource.errors.empty?
+          respond_to do |format|
+            format.json { render json: resource, status: :ok }
+            format.any { redirect_to root_path }
+          end
+        else
+          render json: {
+            message: 'Record invalid',
+            errors: resource.errors.full_messages
+          }, status: :unprocessable_entity
         end
-      else
-        render json: {
-          message: 'Record invalid',
-          errors: resource.errors.full_messages
-        }, status: :unprocessable_entity
+        return
       end
-      return
     end
   end
-end
\ No newline at end of file
+end
diff --git a/app/controllers/users/registrations_controller.rb b/app/controllers/users/registrations_controller.rb
index 0aae89d..7a9560b 100644
--- a/app/controllers/users/registrations_controller.rb
+++ b/app/controllers/users/registrations_controller.rb
@@ -1,28 +1,32 @@
+# frozen_string_literal: true
+
 # Copyright (C) 2024 Manuel Bustillo
 
-class Users::RegistrationsController < Devise::RegistrationsController
-  clear_respond_to 
-  respond_to :json
+module Users
+  class RegistrationsController < Devise::RegistrationsController
+    clear_respond_to
+    respond_to :json
 
-  before_action :validate_captcha!, only: :create
+    before_action :validate_captcha!, only: :create
 
-  def create
-    wedding = Wedding.create(slug: params[:slug])
-    unless wedding.persisted?
-      render json: { errors: wedding.errors.full_messages }, status: :unprocessable_entity
-      return
-    end
+    def create
+      wedding = Wedding.create(slug: params[:slug])
+      unless wedding.persisted?
+        render json: { errors: wedding.errors.full_messages }, status: :unprocessable_entity
+        return
+      end
 
-    ActsAsTenant.with_tenant(wedding) do
-      super do |user|
-        wedding.destroy unless user.persisted?
+      ActsAsTenant.with_tenant(wedding) do
+        super do |user|
+          wedding.destroy unless user.persisted?
+        end
       end
     end
-  end
 
-  private
+    private
 
-  def set_tenant
-    set_current_tenant(nil)
+    def set_tenant
+      set_current_tenant(nil)
+    end
   end
-end
\ No newline at end of file
+end
diff --git a/app/controllers/users/sessions_controller.rb b/app/controllers/users/sessions_controller.rb
index 0de9af5..4b7c7d6 100644
--- a/app/controllers/users/sessions_controller.rb
+++ b/app/controllers/users/sessions_controller.rb
@@ -1,6 +1,10 @@
+# frozen_string_literal: true
+
 # Copyright (C) 2024 Manuel Bustillo
 
-class Users::SessionsController < Devise::SessionsController
-  clear_respond_to
-  respond_to :json
-end
\ No newline at end of file
+module Users
+  class SessionsController < Devise::SessionsController
+    clear_respond_to
+    respond_to :json
+  end
+end