Some more functions.

app/controllers/documents_controller.rb

@@ -4,7 +4,7 @@ class DocumentsController < ApplicationController
   # GET /documents
   # GET /documents.json
   def index
-    @documents = Document.all
+    @documents = User.find(session[:user_id]).documents
   end
 
   # GET /documents/1
@@ -27,6 +27,7 @@ class DocumentsController < ApplicationController
     @document = Document.new(document_params)
 
     @document.name = @document.doc_file_name
+    @document.user = User.find(session[:user_id])
 
     if Document.exists?(doc_fingerprint: @document.doc_fingerprint)
     end

app/controllers/sessions_controller.rb

@@ -16,5 +16,6 @@ class SessionsController < ApplicationController
 
   def destroy
     session[:user_id] = nil
+    redirect_to documents_url
   end
 end

app/models/document.rb

@@ -1,4 +1,12 @@
 class Document < ApplicationRecord
-  has_attached_file :doc, adapter_options: { hash_digest: Digest::SHA256 }
+  belongs_to :user
+  has_and_belongs_to_many :tags
+
+  has_attached_file :doc,
+  {
+    adapter_options: { hash_digest: Digest::SHA256 },
+    url: "/system/:class/:attachment/:id_partition/:style/:hash.:extension",
+    hash_secret: Rails.application.secrets.secret_key_base
+  }
   validates_attachment_content_type :doc, content_type: 'application/pdf'
 end

app/models/tag.rb

@@ -0,0 +1,3 @@
+class Tag < ApplicationRecord
+  has_and_belongs_to_many :documents
+end

app/models/user.rb

@@ -1,3 +1,5 @@
 class User < ApplicationRecord
   has_secure_password
+
+  has_many :documents, dependent: :destroy
 end

db/migrate/20161124165646_create_tags.rb

@@ -0,0 +1,10 @@
+class CreateTags < ActiveRecord::Migration[5.0]
+  def change
+    create_table :tags do |t|
+      t.string :value
+      t.boolean :automatically_asigned
+
+      t.timestamps
+    end
+  end
+end

db/migrate/20161124171050_add_user_to_document.rb

@@ -0,0 +1,5 @@
+class AddUserToDocument < ActiveRecord::Migration[5.0]
+  def change
+    add_reference :documents, :user, index: true
+  end
+end

db/migrate/20161124174721_create_join_table_documents_tags.rb

@@ -0,0 +1,5 @@
+class CreateJoinTableDocumentsTags < ActiveRecord::Migration[5.0]
+  def change
+    create_join_table :documents, :tags
+  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: 20161124142626) do
+ActiveRecord::Schema.define(version: 20161124174721) do
 
   create_table "documents", force: :cascade do |t|
     t.string   "name"
@@ -21,7 +21,21 @@ ActiveRecord::Schema.define(version: 20161124142626) do
     t.integer  "doc_file_size"
     t.datetime "doc_updated_at"
     t.string   "doc_fingerprint"
+    t.integer  "user_id"
     t.index ["doc_fingerprint"], name: "index_documents_on_doc_fingerprint"
+    t.index ["user_id"], name: "index_documents_on_user_id"
+  end
+
+  create_table "documents_tags", id: false, force: :cascade do |t|
+    t.integer "document_id", null: false
+    t.integer "tag_id",      null: false
+  end
+
+  create_table "tags", force: :cascade do |t|
+    t.string   "value"
+    t.boolean  "automatically_asigned"
+    t.datetime "created_at",            null: false
+    t.datetime "updated_at",            null: false
   end
 
   create_table "users", force: :cascade do |t|

test/fixtures/tags.yml

@@ -0,0 +1,7 @@
+# Read about fixtures at http://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
+
+one:
+  value: MyString
+
+two:
+  value: MyString

test/models/tag_test.rb

@@ -0,0 +1,7 @@
+require 'test_helper'
+
+class TagTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end