修改判断pdf的错误

app/models/attachment_history.rb

@@ -20,4 +20,14 @@ class AttachmentHistory < ApplicationRecord
     is_public == 1
   end
 
+  def is_history_pdf?
+    is_pdf = false
+    file_content_type = content_type
+    file_ext_type = File.extname(filename).strip.downcase[1..-1]
+    if (file_content_type.present? && file_content_type.downcase.include?("pdf")) || (file_ext_type.present? && file_ext_type.include?("pdf"))
+      is_pdf = true
+    end
+    is_pdf
+  end
+
 end

app/views/attachment_histories/_attachment_history.json.jbuilder

@@ -7,4 +7,4 @@ json.quotes attachment.quotes_count
 json.downloads_count attachment.downloads_count
 json.created_on attachment.created_on
 json.url attachment_path(attachment, type: 'history')
-json.is_pdf attachment.is_pdf?
+json.is_pdf attachment.is_history_pdf?