Add per user time zone support

app/controllers/accounts/profiles_controller.rb

@@ -25,7 +25,7 @@ def set_user
       end
 
       def user_params
-        params.require(:user).permit(:email, :full_name)
+        params.require(:user).permit(:email, :full_name, :time_zone)
       end
 
       def after_update_url

app/controllers/application_controller.rb

@@ -2,6 +2,7 @@
 
 class ApplicationController < ActionController::Base
   before_action :prepare_meta_tags, if: -> { request.format.html? }
+  before_action :set_time_zone
 
   include StoreLocation
 
@@ -56,4 +57,9 @@ def #{s}!(redirect_url: nil)
       end
       RUBY_EVAL
     end
+
+  private
+    def set_time_zone
+      Time.zone = current_user.time_zone if current_user&.time_zone&.present?
+    end
 end

app/views/accounts/profiles/show.html.erb

@@ -9,6 +9,12 @@
           <p class="text-muted">
             <%= t(".section.email.description") %>
           </p>
+          <h5>
+            <%= t(".section.time_zone.title") %>
+          </h5>
+          <p class="text-muted">
+            <%= t(".section.time_zone.description") %>
+          </p>
         </div>
         <div class="col-lg-8">
           <%= form_with(model: @user, url: account_profile_path, html: {method: :put}, local: true) do |f| %>
@@ -17,6 +23,11 @@
               <%= f.email_field :email, id: "user_email", autofocus: true, required: "required", class: "form-control", class_for_error: "is-invalid" %>
               <%= f.error_message :email, class: "invalid-feedback" %>
             </div>
+            <div class="form-group text-left">
+              <%= f.label :time_zone %>
+              <%= f.select :time_zone, ActiveSupport::TimeZone::MAPPING.sort, {}, id: "user_time_zone", autofocus: true, required: "required", class: "form-control", class_for_error: "is-invalid" %>
+              <%= f.error_message :time_zone, class: "invalid-feedback" %>
+            </div>
 
             <%= f.submit t(".submit"), class: "btn btn-block btn-primary" %>
           <% end %>

config/locales/views/accounts/profiles/en.yml

@@ -9,3 +9,6 @@ en:
           email:
             title: "Email"
             description: "After a successful email update, you should use new email on next log in."
+          time_zone:
+            title: "Time zone"
+            description: "After a successful time zone update, the time will be shown in correct time zone"

config/locales/views/accounts/profiles/zh-CN.yml

@@ -9,3 +9,6 @@ zh-CN:
           email:
             title: "邮箱"
             description: "这些信息会影响到下一次登录，并且不能和其他用户的重复"
+          time_zone:
+            title: "时区"
+            description: "这个选项会影响显示的时间的时区"

db/migrate/20190809022738_add_user_time_zone.rb

@@ -0,0 +1,5 @@
+class AddUserTimeZone < ActiveRecord::Migration[6.0]
+  def change
+    add_column :users, :time_zone, :string
+  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: 2019_03_02_174954) do
+ActiveRecord::Schema.define(version: 2019_08_09_022738) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -43,6 +43,7 @@
     t.integer "invitations_count", default: 0
     t.datetime "created_at", precision: 6, null: false
     t.datetime "updated_at", precision: 6, null: false
+    t.string "time_zone"
     t.index ["confirmation_token"], name: "index_users_on_confirmation_token", unique: true
     t.index ["email"], name: "index_users_on_email", unique: true
     t.index ["invitation_token"], name: "index_users_on_invitation_token", unique: true