User can rsvp

0021, 0217, 0220

Allow user to cancel their intention to attend an event.

0022, 0217, 0222?

Show event attendees.

Add attendees of an event, reformat some dates

0024

Translate all the things.

0055

Use .user_cards for event attendances too.

0092

Disable 1 button

0176

Add events to header.

0179

Add yes and no traits to event attendance factory.

0189

Add tests for routing.

0217

Not going to force user to belong to community in order to attend event.

When using constants instead of strings, use them everywhere.

0219

Create update_params for update and add another test.

Finish writing tests for EventAttendancesController.

0220

Handle plurals better

0228

If the user is not signed in, provide a link to login before having them RSVP.

0230

No need for :login_link.  We just display a sentence with no params.

0231

Add maybe constant and convenience functions.

Convert event attendance intention to enum.

0273

Display RSVPs as cards using a partial.

User can only update their own RSVP.

Use "could not be" phrasing.

app/abilities/ability.rb

@@ -72,6 +72,8 @@ def initialize(user)
         can [:destroy, :edit, :update], CommunityMember, :community => user_is_community_organizer
         can [:destroy], CommunityMember, :user_id => user.id
         can [:create, :edit, :new, :update], Event, :community => user_is_community_organizer
+        can [:create], EventAttendance
+        can [:update], EventAttendance, :user_id => user.id
 
         if user.moderator?
           can [:hide, :hidecomment], DiaryEntry

app/controllers/event_attendances_controller.rb

@@ -0,0 +1,40 @@
+class EventAttendancesController < ApplicationController
+  layout "site"
+  before_action :authorize_web
+  before_action :set_event_attendance, :only => [:update]
+
+  authorize_resource
+
+  def create
+    attendance = EventAttendance.new(event_attendance_params)
+    if attendance.save
+      redirect_to event_path(attendance.event), :notice => t(".success")
+    else
+      redirect_to event_path(attendance.event), :alert => t(".failure")
+    end
+  end
+
+  def update
+    respond_to do |format|
+      if @event_attendance.update(update_params)
+        format.html { redirect_to @event_attendance.event, :notice => t(".success") }
+      else
+        format.html { redirect_to :edit, :alert => t(".failure") }
+      end
+    end
+  end
+
+  private
+
+  def set_event_attendance
+    @event_attendance = EventAttendance.find(params[:id])
+  end
+
+  def event_attendance_params
+    params.require(:event_attendance).permit(:event_id, :user_id, :intention)
+  end
+
+  def update_params
+    params.require(:event_attendance).permit(:intention)
+  end
+end

app/controllers/events_controller.rb

@@ -23,12 +23,31 @@ def index
     render :template => "communities/no_such_community", :status => :not_found
   end
 
+  # GET /events/1
+  # GET /events/1.json
+  def show
+    @community = Community.friendly.find(params[:community_id]) if params[:community_id]
+    @my_attendance = EventAttendance.find_or_initialize_by(:event_id => @event.id, :user_id => current_user&.id)
+    @yes_check = @my_attendance.intention == EventAttendance::Intentions::YES ? "✓" : ""
+    @no_check = @my_attendance.intention == EventAttendance::Intentions::NO ? "✓" : ""
+    @maybe_check = @my_attendance.intention == EventAttendance::Intentions::MAYBE ? "✓" : ""
+    @yes_disabled = @my_attendance.intention == EventAttendance::Intentions::YES
+    @no_disabled = @my_attendance.intention == EventAttendance::Intentions::NO
+    @maybe_disabled = @my_attendance.intention == EventAttendance::Intentions::MAYBE
+  rescue ActiveRecord::RecordNotFound
+    @not_found_community = params[:community_id]
+    render :template => "communities/no_such_community", :status => :not_found
+  end
+
   # GET /events/new
   def new
     @title = t ".new"
     @event = Event.new(event_params_new)
   end
 
+  # GET /events/1/edit
+  def edit; end
+
   # POST /events
   # POST /events.json
   def create
@@ -44,9 +63,6 @@ def create
     end
   end
 
-  # GET /events/1/edit
-  def edit; end
-
   def update
     if @event.update(event_params)
       redirect_to @event, :notice => t(".success")
@@ -56,15 +72,6 @@ def update
     end
   end
 
-  # GET /events/1
-  # GET /events/1.json
-  def show
-    @community = Community.friendly.find(params[:community_id]) if params[:community_id]
-  rescue ActiveRecord::RecordNotFound
-    @not_found_community = params[:community_id]
-    render :template => "communities/no_such_community", :status => :not_found
-  end
-
   private
 
   def warn_if_event_in_past

app/models/event.rb

@@ -18,6 +18,7 @@
 class Event < ApplicationRecord
   belongs_to :community
   has_many :event_organizers
+  has_many :event_attendances
 
   scope :future, -> { where("moment >= ?", Time.now.utc) }
   scope :past, -> { where("moment < ?", Time.now.utc) }
@@ -55,4 +56,20 @@ def organizers
   def past?
     moment < Time.now.utc
   end
+
+  def attendees(intention)
+    EventAttendance.where(:event_id => id, :intention => intention)
+  end
+
+  def yes_attendees
+    attendees(EventAttendance::Intentions::YES)
+  end
+
+  def no_attendees
+    attendees(EventAttendance::Intentions::NO)
+  end
+
+  def maybe_attendees
+    attendees(EventAttendance::Intentions::MAYBE)
+  end
 end

app/models/event_attendance.rb

@@ -0,0 +1,29 @@
+# == Schema Information
+#
+# Table name: event_attendances
+#
+#  id         :bigint(8)        not null, primary key
+#  user_id    :integer          not null
+#  event_id   :integer          not null
+#  intention  :enum             not null
+#  created_at :datetime         not null
+#  updated_at :datetime         not null
+#
+# Indexes
+#
+#  index_event_attendances_on_event_id  (event_id)
+#  index_event_attendances_on_user_id   (user_id)
+#
+
+class EventAttendance < ApplicationRecord
+  module Intentions
+    YES = "Yes".freeze
+    NO = "No".freeze
+    MAYBE = "Maybe".freeze
+    ALL_INTENTIONS = [YES, NO, MAYBE].freeze
+  end
+  validates :intention, :inclusion => { :in => Intentions::ALL_INTENTIONS }
+
+  belongs_to :event
+  belongs_to :user
+end

app/views/events/show.html.erb

@@ -23,7 +23,22 @@
       </p>
     </div>
     <div class="col-sm">
+      <p><%= t(".people_are_going", :count => @event.yes_attendees.size) %></p>
       <p><%= t(".are_you_going") %></p>
+      <% if current_user %>
+        <%= form_with :model => @my_attendance do |form| %>
+          <%= form.hidden_field(:event_id, :value => @event.id) %>
+          <%= form.hidden_field(:user_id, :value => current_user&.id) %>
+          <%= form.submit :name => "event_attendance[intention]", :value => @yes_check + t(".going_yes"), :disabled => @yes_disabled %>
+          <%= form.submit :name => "event_attendance[intention]", :value => @no_check + t(".going_no"), :disabled => @no_disabled %>
+          <%= form.submit :name => "event_attendance[intention]", :value => @maybe_check + t(".going_maybe"), :disabled => @maybe_disabled %>
+        <% end %>
+      <% else %>
+        <p>
+          <%# TODO: Use login_path %>
+          <%= t(".login_to_rsvp") %>
+        </p>
+      <% end %>
     </div>
     <h1>
       <%= @event.title %>
@@ -56,6 +71,24 @@
         <strong><%= t(".description") %>:</strong>
         <%= @event.description %>
       </p>
+      <strong><%= t(".who_yes") %></strong>
+      <div>
+        <% @event.yes_attendees.each do |attendance| %>
+          <%= render :partial => "users/user_card", :locals => { :user => attendance.user } %>
+        <% end %>
+      </div>
+      <strong><%= t(".who_maybe") %></strong>
+      <div>
+        <% @event.maybe_attendees.each do |attendance| %>
+          <%= render :partial => "users/user_card", :locals => { :user => attendance.user } %>
+        <% end %>
+      </div>
+      <strong><%= t(".who_no") %></strong>
+      <div>
+        <% @event.no_attendees.each do |attendance| %>
+          <%= render :partial => "users/user_card", :locals => { :user => attendance.user } %>
+        <% end %>
+      </div>
     </div>
     <div class="col-sm">
       <p>

app/views/layouts/_header.html.erb

@@ -47,6 +47,9 @@
       <li class="compact-hide nav-item <%= current_page_class(communities_path) %>">
         <%= link_to t("layouts.communities"), communities_path, :class => "nav-link" %>
       </li>
+      <li class="compact-hide nav-item <%= current_page_class(events_path) %>">
+        <%= link_to t("layouts.events"), events_path, :class => "nav-link" %>
+      </li>
       <li class="compact-hide nav-item <%= current_page_class(traces_path) %>">
         <%= link_to t("layouts.gps_traces"), traces_path, :class => "nav-link" %>
       </li>
@@ -77,6 +80,7 @@
             </li>
           <% end %>
           <li class="<%= current_page_class(communities_path) %>"><%= link_to t("layouts.communities"), communities_path, :class => "dropdown-item" %></li>
+          <li class="<%= current_page_class(events_path) %>"><%= link_to t("layouts.events"), events_path, :class => "dropdown-item" %></li>
           <li class="<%= current_page_class(traces_path) %>"><%= link_to t("layouts.gps_traces"), traces_path, :class => "dropdown-item" %></li>
           <li class="<%= current_page_class(diary_entries_path) %>"><%= link_to t("layouts.user_diaries"), diary_entries_path, :class => "dropdown-item" %></li>
           <li class="<%= current_page_class(community_index_path) %>"><%= link_to t("layouts.communities"), community_index_path, :class => "dropdown-item" %></li>

config/locales/en.yml

@@ -699,6 +699,13 @@ en:
     not_found:
       title: File not found
       description: Couldn't find a file/directory/API operation by that name on the OpenStreetMap server (HTTP 404)
+  event_attendances:
+    create:
+      success: Attendance was successfully saved.
+      failure: Attendance could not be saved.
+    update:
+      success: Attendance was successfully updated.
+      failure: Attendance could not be updated.
   events:
     create:
       success: Event was created successfully.
@@ -724,11 +731,22 @@ en:
       description: "Description"
       directions_to: "Directions to this location."
       edit: "Edit"
+      going_maybe: "Maybe"
+      going_no: "No"
+      going_yes: "Yes"
       hosted_by: "Hosted by"
       location: "Location"
+      login_to_rsvp: "Login to RSVP."
       organized_by: "Organized by"
       past: "Event is in the past."
+      people_are_going:
+        zero: ""
+        one: "One person is going."
+        other: "%{count} people are going"
       when: "When"
+      who_yes: "Going"
+      who_no: "Not Going"
+      who_maybe: "Might Go"
     update:
       success: "The event was successfully updated."
       failure: "The event was not updated."
@@ -1644,6 +1662,9 @@ en:
     home: Go to Home Location
     logout: Log Out
     log_in: Log In
+    log_in_tooltip: Log in with an existing account
+    communities: Communities
+    events: Events
     sign_up: Sign Up
     start_mapping: Start Mapping
     edit: Edit

config/routes.rb

@@ -339,6 +339,7 @@
   resources :community_members, :only => [:create, :destroy, :edit, :new, :update]
   get "/community_members" => "community_members#create", :as => "login_to_join"
   resources :events
+  resources :event_attendances
 
   # errors
   match "/403", :to => "errors#forbidden", :via => :all

db/migrate/20221010234421_create_event_attendances.rb

@@ -0,0 +1,18 @@
+class CreateEventAttendances < ActiveRecord::Migration[7.0]
+  def up
+    create_enumeration :event_attendances_intention_enum, %w[Maybe No Yes]
+    create_table :event_attendances do |t|
+      t.references :user, :foreign_key => true, :null => false, :index => true
+      t.references :event, :foreign_key => true, :null => false, :index => true
+      t.column :intention, :event_attendances_intention_enum, :null => false
+
+      t.timestamps
+    end
+    add_index :event_attendances, [:user_id, :event_id], :unique => true
+  end
+
+  def down
+    drop_table :event_attendances
+    drop_enumeration :event_attendances_intention_enum
+  end
+end