From 88f82ca888adf88cd5ed29c4376753a653ec5874 Mon Sep 17 00:00:00 2001
From: Erik Brendel <erik.brendel@student.hpi.de>
Date: Sat, 4 Nov 2017 00:02:52 +0100
Subject: [PATCH] Refs #31: 5 author selections, wet

---
 app/controllers/papers_controller.rb |  5 +++++
 app/models/paper.rb                  | 20 ++++++++++++++++++++
 app/views/papers/edit.html.erb       | 11 +++++++++++
 3 files changed, 36 insertions(+)

diff --git a/app/controllers/papers_controller.rb b/app/controllers/papers_controller.rb
index 5f3617d..90af259 100644
--- a/app/controllers/papers_controller.rb
+++ b/app/controllers/papers_controller.rb
@@ -27,6 +27,11 @@ def create
 
   def update
     @paper = Paper.find(params[:id])
+    @paper.authors = []
+    for i in 1..5
+      id = params.require(:paper)[('author' + i.to_s).to_sym]
+      @paper.authors << Author.find(id) if id && !id.to_s.empty?
+    end
 
     if @paper.update(paper_params)
       redirect_to @paper
diff --git a/app/models/paper.rb b/app/models/paper.rb
index 9592592..b6339c3 100644
--- a/app/models/paper.rb
+++ b/app/models/paper.rb
@@ -2,4 +2,24 @@ class Paper < ActiveRecord::Base
   validates :title, :venue, :year, presence: true
   validates :year, numericality: { only_integer: true }
   has_and_belongs_to_many :authors
+
+  def author1
+    authors[0].id if authors[0]
+  end
+
+  def author2
+    authors[1].id if authors[1]
+  end
+
+  def author3
+    authors[2].id if authors[2]
+  end
+
+  def author4
+    authors[3].id if authors[3]
+  end
+
+  def author5
+    authors[4].id if authors[4]
+  end
 end
diff --git a/app/views/papers/edit.html.erb b/app/views/papers/edit.html.erb
index 145f44b..827dade 100644
--- a/app/views/papers/edit.html.erb
+++ b/app/views/papers/edit.html.erb
@@ -31,6 +31,17 @@
       <%= f.text_field :year %>
     </p>
 
+    <%= f.label 'Author 1', for: 'paper_author_id_1' %><br>
+    <%= f.collection_select(:author1, Author.all, :id, :name, prompt: true) %><br>
+    <%= f.label 'Author 2', for: 'paper_author_id_2' %><br>
+    <%= f.collection_select(:author2, Author.all, :id, :name, prompt: true) %><br>
+    <%= f.label 'Author 3', for: 'paper_author_id_3' %><br>
+    <%= f.collection_select(:author3, Author.all, :id, :name, prompt: true) %><br>
+    <%= f.label 'Author 4', for: 'paper_author_id_4' %><br>
+    <%= f.collection_select(:author4, Author.all, :id, :name, prompt: true) %><br>
+    <%= f.label 'Author 5', for: 'paper_author_id_5' %><br>
+    <%= f.collection_select(:author5, Author.all, :id, :name, prompt: true) %>
+
     <p>
       <%= f.submit %>
     </p>