fixed schema and tests for n:m, solved #29

app/controllers/authors_controller.rb

@@ -14,12 +14,13 @@ def new
 
   def edit
   	@author = Author.find(params[:id])
+
   end
 
 
 def create
   	@author = Author.new(author_params)
-
+    
   	if @author.save
   		redirect_to @author
   	else

app/controllers/papers_controller.rb

@@ -9,6 +9,7 @@ def show
 
   def new
   		@paper = Paper.new
+
   end
 
   def edit
@@ -18,6 +19,7 @@ def edit
 
 def create
   	@paper = Paper.new(paper_params)
+    @paper.authors=[]
 
   	if @paper.save
   		redirect_to @paper

db/migrate/20171109193956_join_papers_and_authors.rb

@@ -1,5 +1,8 @@
 class JoinPapersAndAuthors < ActiveRecord::Migration
   def change
-  	create_join_table :authors, :papers
+  	create_join_table :authors, :papers do |t|
+      t.index [:author_id, :paper_id]
+      t.index [:paper_id, :author_id]
+    end
   end
 end

db/schema.rb

@@ -26,6 +26,9 @@
     t.integer "paper_id",  null: false
   end
 
+  add_index "authors_papers", ["author_id", "paper_id"], name: "index_authors_papers_on_author_id_and_paper_id"
+  add_index "authors_papers", ["paper_id", "author_id"], name: "index_authors_papers_on_paper_id_and_author_id"
+
   create_table "papers", force: :cascade do |t|
     t.string   "title"
     t.string   "venue"

spec/factories/authors.rb

@@ -4,5 +4,6 @@
     last_name "Turing"
     homepage "http://wikipedia.de/Alan_Turing"
     id "1"
+
   end
 end

spec/models/author_spec.rb

@@ -19,6 +19,12 @@
 
   end
 
+  it "have papers" do
+    author = Author.new()
+    expect(author.papers).to be_empty
+
+  end
+
 
 
 end

spec/models/paper_spec.rb

@@ -24,4 +24,9 @@
 
   end
 
+  it "Should have authors" do
+  	paper=Paper.new()
+  	expect(paper.authors).to be_empty
+  end
+
 end