Added previews, load pdf with selected page.

app/jobs/content_generation_job.rb

@@ -2,25 +2,57 @@ class ContentGenerationJob < ApplicationJob
   require 'docsplit'
 
   @document_id = nil
+  @document = nil
+  @content = nil
 
   queue_as :default
 
-  after_perform :generate_tags
+  # after_perform :generate_tags
 
   def perform(document_id)
     @document_id = document_id
-    document = Document.find(document_id)
-    Docsplit.extract_text(document.doc.path, output: 'tmp/raw_content')
-    file_path = 'tmp/raw_content/' + File.basename(document.doc.path, 'pdf') + 'txt'
-    text = IO.read(file_path)
+    @document = Document.find(document_id)
+    @content = @document.build_content
 
-    content = document.build_content(text: text)
-    content.save!
-
-    File.delete(file_path) if File.exist?(file_path)
+    generate_metadata
+    generate_text
+    generate_page_previews
   end
 
   private
+    def generate_metadata
+      length = Docsplit.extract_length(@document.doc.path, output: 'tmp/raw_content')
+      @content.pagecount = length
+      @content.save
+    end
+
+    def generate_text
+      Docsplit.extract_text(@document.doc.path, output: 'tmp/raw_content')
+      file_path = 'tmp/raw_content/' + File.basename(@document.doc.path, 'pdf') + 'txt'
+      text = IO.read(file_path)
+      @content.text = text
+      @content.save!
+
+      File.delete(file_path) if File.exist?(file_path)
+    end
+
+    def generate_page_previews
+      file_basename = File.basename(@document.doc.path, '.pdf')
+      folder_path = 'tmp/raw_content/' + file_basename
+      Docsplit.extract_images(@document.doc.path, output: folder_path, size: '200x', format: :png)
+      @content.pagecount.times do |page|
+        i = page + 1
+        page_preview = @content.page_previews.build
+        puts 'build fine'
+        file = File.open(folder_path + '/' + File.basename(@document.doc.path, '.pdf') + '_' + i.to_s + '.png', 'rb')
+        puts 'opened fine'
+        page_preview.preview = file
+        page_preview.pagenumber = i
+        file.close
+        page_preview.save
+      end
+    end
+
     def generate_tags
       TagGenerationJob.perform_now @document_id
     end

app/models/content.rb

@@ -1,3 +1,4 @@
 class Content < ApplicationRecord
   belongs_to :document
+  has_many :page_previews, dependent: :destroy
 end

app/models/page_preview.rb

@@ -0,0 +1,11 @@
+class PagePreview < ApplicationRecord
+  belongs_to :content
+
+  has_attached_file :preview,
+  {
+    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 :preview, content_type: 'image/png'
+end

app/views/documents/index.html.erb

@@ -7,7 +7,7 @@
     <tr>
       <th>Category</th>
       <th>Name</th>
-      <th colspan="3"></th>
+      <th>Created</th>
     </tr>
   </thead>
 
@@ -15,10 +15,8 @@
     <% @documents.each do |document| %>
       <tr>
         <td><%= document.category.get_fqcn %></td>
-        <td><%= document.name %></td>
-        <td><%= link_to 'Show', document %></td>
-        <td><%= link_to 'Edit', edit_document_path(document) %></td>
-        <td><%= link_to 'Destroy', document, method: :delete, data: { confirm: 'Are you sure?' } %></td>
+        <td><%= link_to document.name, document %></td>
+        <td><%= document.created_at.localtime %></td>
       </tr>
     <% end %>
   </tbody>

app/views/documents/show.html.erb

@@ -10,7 +10,11 @@
   <%= @document.category.get_fqcn %>
 </p>
 
-<% if File.exists?(@document.doc.path(:thumb)) %>
+<% if @document.content.page_previews.any? %>
+  <% @document.content.page_previews.each do |page_preview| %>
+    <%= link_to image_tag(page_preview.preview.url, alt: 'Page #' + page_preview.pagenumber.to_s), @document.doc.url + '#page=' + page_preview.pagenumber.to_s %>
+  <% end %>
+<% elsif File.exists?(@document.doc.path(:thumb)) %>
   <p>
     <%= link_to image_tag(@document.doc.url(:thumb), alt: 'Thumbnail of PDF'), @document.doc.url %>
   </p>
@@ -22,6 +26,10 @@
 
 <% if @document.content %>
   <p>
+    <strong>Pagecount:</strong>
+    <%= @document.content.pagecount %>
+  </p>
+  <p>
     <strong>Content:</strong>
     <%= @document.content.text.truncate_words(30) %>
   </p>
@@ -33,4 +41,5 @@
 
 
 <%= link_to 'Edit', edit_document_path(@document) %> |
+<%= link_to 'Destroy', @document, method: :delete, data: { confirm: 'Are you sure?' } %> |
 <%= link_to 'Back', documents_path %>

db/migrate/20161126215021_add_pagecount_to_content.rb

@@ -0,0 +1,5 @@
+class AddPagecountToContent < ActiveRecord::Migration[5.0]
+  def change
+    add_column :contents, :pagecount, :integer, default: -1
+  end
+end

db/migrate/20161126222233_create_page_previews.rb

@@ -0,0 +1,9 @@
+class CreatePagePreviews < ActiveRecord::Migration[5.0]
+  def change
+    create_table :page_previews do |t|
+      t.references :content, foreign_key: true
+
+      t.timestamps
+    end
+  end
+end

db/migrate/20161126222301_add_attachment_preview_to_page_previews.rb

@@ -0,0 +1,11 @@
+class AddAttachmentPreviewToPagePreviews < ActiveRecord::Migration
+  def self.up
+    change_table :page_previews do |t|
+      t.attachment :preview
+    end
+  end
+
+  def self.down
+    remove_attachment :page_previews, :preview
+  end
+end

db/migrate/20161126234039_add_pagenumber_to_page_preview.rb

@@ -0,0 +1,5 @@
+class AddPagenumberToPagePreview < ActiveRecord::Migration[5.0]
+  def change
+    add_column :page_previews, :pagenumber, :integer
+  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: 20161125201757) do
+ActiveRecord::Schema.define(version: 20161126234039) do
 
   create_table "categories", force: :cascade do |t|
     t.string   "name"
@@ -25,8 +25,9 @@ ActiveRecord::Schema.define(version: 20161125201757) do
   create_table "contents", force: :cascade do |t|
     t.text     "text"
     t.integer  "document_id"
-    t.datetime "created_at",  null: false
-    t.datetime "updated_at",  null: false
+    t.datetime "created_at",               null: false
+    t.datetime "updated_at",               null: false
+    t.integer  "pagecount",   default: -1
     t.index ["document_id"], name: "index_contents_on_document_id"
   end
 
@@ -51,6 +52,18 @@ ActiveRecord::Schema.define(version: 20161125201757) do
     t.integer "tag_id",      null: false
   end
 
+  create_table "page_previews", force: :cascade do |t|
+    t.integer  "content_id"
+    t.datetime "created_at",           null: false
+    t.datetime "updated_at",           null: false
+    t.string   "preview_file_name"
+    t.string   "preview_content_type"
+    t.integer  "preview_file_size"
+    t.datetime "preview_updated_at"
+    t.integer  "pagenumber"
+    t.index ["content_id"], name: "index_page_previews_on_content_id"
+  end
+
   create_table "tags", force: :cascade do |t|
     t.string   "value"
     t.boolean  "automatically_asigned"

test/fixtures/page_previews.yml

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

test/models/page_preview_test.rb

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