PDF view in letter view

Gemfile

@@ -44,6 +44,8 @@ gem "tzinfo-data", platforms: %i[ mswin mswin64 mingw x64_mingw jruby ]
 # Reduces boot times through caching; required in config/boot.rb
 gem "bootsnap", require: false
 
+gem "image_processing", ">= 1.2"
+
 group :development, :test do
   # See https://guides.rubyonrails.org/debugging_rails_applications.html#debugging-with-the-debug-gem
   gem "debug", platforms: %i[ mri mswin mswin64 mingw x64_mingw ]

Gemfile.lock

@@ -104,10 +104,14 @@ GEM
     drb (2.2.1)
     error_highlight (0.6.0)
     erubi (1.12.0)
+    ffi (1.17.0)
     globalid (1.2.1)
       activesupport (>= 6.1)
     i18n (1.14.5)
       concurrent-ruby (~> 1.0)
+    image_processing (1.12.2)
+      mini_magick (>= 4.9.5, < 5)
+      ruby-vips (>= 2.0.17, < 3)
     importmap-rails (2.0.1)
       actionpack (>= 6.0.0)
       activesupport (>= 6.0.0)
@@ -129,6 +133,7 @@ GEM
       net-smtp
     marcel (1.0.4)
     matrix (0.4.2)
+    mini_magick (4.12.0)
     mini_mime (1.1.5)
     minitest (5.23.1)
     msgpack (1.7.2)
@@ -196,6 +201,8 @@ GEM
       io-console (~> 0.5)
     rexml (3.2.8)
       strscan (>= 3.0.9)
+    ruby-vips (2.2.1)
+      ffi (~> 1.12)
     rubyzip (2.3.2)
     selenium-webdriver (4.21.1)
       base64 (~> 0.2)
@@ -245,6 +252,7 @@ DEPENDENCIES
   cssbundling-rails
   debug
   error_highlight (>= 0.4.0)
+  image_processing (>= 1.2)
   importmap-rails
   jbuilder
   puma (>= 5.0)

app/views/letters/show.html.erb

@@ -1,8 +1,12 @@
 <h2><%= @letter.title %></h2>
 
-Rédigée par : <%= @letter.author %> <% unless @letter.private_email %>(<%= @letter.email %>) <% end %>
+Rédigée par : <%= @letter.author %>
+<% unless @letter.private_email %>
+  (<%= @letter.email %>)
+<% end %>
 
 <div>
-  <%= @letter.document %>
+  <iframe src="<%= url_for @letter.document %>"
+          type="<%= @letter.document.attachment.blob.content_type %>"
+          style="width:1000px; height:800px;"></iframe>
 </div>
-