Fix a bug related to trying to call lo_import on tempfiles that haven't been persisted

active_storage-postgresql.gemspec

@@ -22,6 +22,6 @@ Gem::Specification.new do |s|
     "!= 1.4.0", "!= 1.4.1", "!= 1.4.2", "!= 1.4.3", "!= 1.4.4", "!= 1.4.5"
 
   s.add_development_dependency "pry", "~> 0.11"
-  s.add_development_dependency "database_cleaner", "~> 1.7"
+  s.add_development_dependency "database_cleaner", "~> 2.0"
   s.add_development_dependency "appraisal"
 end

lib/active_storage/postgresql/file.rb

@@ -13,7 +13,7 @@ def digest
   before_create :verify_checksum, if: :checksum
 
   def write_or_import
-    if io.respond_to?(:to_path)
+    if io.respond_to?(:to_path) && File.exist?(io.to_path)
       import(io.to_path)
     else
       open(::PG::INV_WRITE) do |file|

test/active_storage/shared_service_tests.rb

@@ -33,6 +33,25 @@ module ActiveStorage::Service::SharedServiceTests
       end
     end
 
+    test "uploading a non-persisted (but still readable) file" do
+      begin
+        key  = SecureRandom.base58(24)
+        data = "Something else entirely!"
+        file = Tempfile.open("upload")
+        file.write(data)
+        file.rewind
+        file.delete
+
+        assert !File.exist?(file.to_path)
+
+        @service.upload(key, file, checksum: Digest::MD5.base64digest(data))
+
+        assert_equal data, @service.download(key)
+      ensure
+        @service.delete key
+      end
+    end
+
     test "uploading without integrity" do
       begin
         key  = SecureRandom.base58(24)