ActiveRecord::Schema.define(:version => 1) do
  create_table "articles", :force => true do |t|
    t.column "headline", "string", null: false
    t.column "section", "string"
    t.column "slug", "string", null: false
    t.column "type", "string"
    t.index ["slug"], name: "index_articles_on_slug", unique: true
  end

  create_table "people", :force => true do |t|
    t.column "name", "string"
    t.column "web_slug", "string"
  end

  create_table "companies", :force => true do |t|
    t.column "name", "string"
    t.column "slug", "string"
  end

  create_table "posts", :force => true do |t|
    t.column "headline", "string"
    t.column "slug", "string"
  end

  create_table "events", :force => true do |t|
    t.column "title", "string"
    t.column "location", "string"
    t.column "slug", "string"
  end
end

ActiveRecord::Schema.define(:version => 1) do

  create_table "articles", :force => true do |t|
    t.column "headline", "string"
    t.column "section", "string"
    t.column "slug", "string"
    t.column "type", "string"
  end
  
  create_table "people", :force => true do |t|
    t.column "name", "string"
    t.column "web_slug", "string"
  end
  
  create_table "companies", :force => true do |t|
    t.column "name", "string"
    t.column "slug", "string"
  end
  
  create_table "posts", :force => true do |t|
    t.column "headline", "string"
    t.column "slug", "string"
  end
  
  create_table "events", :force => true do |t|
    t.column "title", "string"
    t.column "location", "string"
    t.column "slug", "string"
  end
  
end
--- 
+++ 
@@ -1,31 +1,30 @@
 ActiveRecord::Schema.define(:version => 1) do
+  create_table "articles", :force => true do |t|
+    t.column "headline", "string", null: false
+    t.column "section", "string"
+    t.column "slug", "string", null: false
+    t.column "type", "string"
+    t.index ["slug"], name: "index_articles_on_slug", unique: true
+  end
 
-  create_table "articles", :force => true do |t|
-    t.column "headline", "string"
-    t.column "section", "string"
-    t.column "slug", "string"
-    t.column "type", "string"
-  end
-  
   create_table "people", :force => true do |t|
     t.column "name", "string"
     t.column "web_slug", "string"
   end
-  
+
   create_table "companies", :force => true do |t|
     t.column "name", "string"
     t.column "slug", "string"
   end
-  
+
   create_table "posts", :force => true do |t|
     t.column "headline", "string"
     t.column "slug", "string"
   end
-  
+
   create_table "events", :force => true do |t|
     t.column "title", "string"
     t.column "location", "string"
     t.column "slug", "string"
   end
-  
 end
Test with not-null constraint and index
