Very unsophisticated mass-Person creation

app/controllers/people_controller.rb

     end
   end
 
+  def mass_new
+  end
+
+  def mass_create
+    require 'csv'
+    uploaded_io = params[:spreadsheet]
+    result = Person.from_csv(uploaded_io.read)
+    flash_message(:success, "#{result.count} people created")
+    redirect_to :people
+  end
+
   # PATCH/PUT /people/1
   # PATCH/PUT /people/1.json
   def update

app/models/person.rb

     self.participants.includes(:activity).where(is_organizer: true)
   end
 
+  # Create multiple Persons from data found in a csv file, return those.
+  def self.from_csv(content)
+    reader = CSV.parse(content, {headers: true, skip_blanks: true})
+
+    result = []
+    reader.each do |row|
+      p = Person.find_by(email: row['email'])
+      if not p
+        p = Person.new
+        p.first_name  = row['first_name']
+        p.infix       = row['infix']
+        p.last_name   = row['last_name']
+        p.email       = row['email']
+        p.birth_date  = Date.strptime(row['birth_date'])
+        p.save!
+      end
+      result << p
+    end
+
+    return result
+  end
   private
   # Assert that the person's birth date, if any, lies in the past.
   def birth_date_cannot_be_in_future

app/views/people/mass_new.html.haml

+.container
+  .row
+    .col-md-12
+      = form_tag('/people/mass_new', method: 'post', multipart: true) do
+        = file_field_tag 'spreadsheet'
+        = submit_tag

config/routes.rb

   get 'logout', to: 'authentication#logout_confirm'
   delete 'logout', to: 'authentication#logout'
 
+  get 'people/mass_new', to: 'people#mass_new'
+  post 'people/mass_new', to: 'people#mass_create'
   resources :people
 
   resources :groups do

public/batch_persons.csv

+first_name,infix,last_name,birth_date,email,organizers