all attributes serialized before writing

lib/active_record/connection_adapters/oracle_enhanced/database_statements.rb

@@ -255,11 +255,9 @@ def write_lobs(table_name, klass, attributes, columns) #:nodoc:
             value = attributes[col.name]
             # changed sequence of next two lines - should check if value is nil before converting to yaml
             next unless value
-            if klass.attribute_types[col.name].is_a? Type::Serialized
-              value = klass.attribute_types[col.name].serialize(value)
-              # value can be nil after serialization because ActiveRecord serializes [] and {} as nil
-              next unless value
-            end
+            value = klass.attribute_types[col.name].serialize(value)
+            # value can be nil after serialization because ActiveRecord serializes [] and {} as nil
+            next unless value
             uncached do
               unless lob_record = select_one(sql = <<~SQL.squish, "Writable Large Object")
                 SELECT #{quote_column_name(col.name)} FROM #{quote_table_name(table_name)}

spec/active_record/oracle_enhanced/type/custom_spec.rb

@@ -0,0 +1,88 @@
+# frozen_string_literal: true
+
+describe "OracleEnhancedAdapter custom types handling" do
+  include SchemaSpecHelper
+
+  before(:all) do
+    ActiveRecord::Base.establish_connection(CONNECTION_PARAMS)
+    schema_define do
+      create_table :test_employees, force: true do |t|
+        t.string    :first_name,  limit: 20
+        t.string    :last_name,   limit: 25
+        t.text      :signature
+      end
+    end
+
+    class TestEmployee < ActiveRecord::Base
+      class AttributeSignature < ActiveRecord::Type::Text
+        def cast(value)
+          case value
+          when Signature
+            value
+          when nil
+            nil
+          else
+            Signature.new(Base64.decode64 value)
+          end
+        end
+
+        def serialize(value)
+          Base64.encode64 value.raw
+        end
+
+        def changed_in_place?(raw_old_value, new_value)
+          new_value != cast(raw_old_value)
+        end
+      end
+
+      class Signature
+        attr_reader :raw
+
+        def initialize(raw_value)
+          @raw = raw_value
+        end
+
+        def to_s
+          "Signature nice string #{raw[0..5]}"
+        end
+
+        def ==(object)
+          raw == object&.raw
+        end
+        alias eql? ==
+      end
+
+      attribute :signature, AttributeSignature.new
+    end
+  end
+
+  after(:all) do
+    schema_define do
+      drop_table :test_employees
+    end
+    Object.send(:remove_const, "TestEmployee")
+    ActiveRecord::Base.clear_cache!
+  end
+
+  it "should serialize LOBs when creating a record" do
+    raw_signature = "peter'ssignature"
+    signature = TestEmployee::Signature.new(raw_signature)
+    @employee = TestEmployee.create!(first_name: "Peter", last_name: "Doe", signature: signature)
+    @employee.reload
+    expect(@employee.signature).to eql(signature)
+    expect(@employee.signature).to_not be(signature)
+    expect(TestEmployee.first.read_attribute_before_type_cast(:signature)).to eq(Base64.encode64 raw_signature)
+  end
+
+  it "should serialize LOBs when updating a record" do
+    raw_signature = "peter'ssignature"
+    signature = TestEmployee::Signature.new(raw_signature)
+    @employee = TestEmployee.create!(first_name: "Peter", last_name: "Doe", signature: TestEmployee::Signature.new("old signature"))
+    @employee.signature = signature
+    @employee.save!
+    @employee.reload
+    expect(@employee.signature).to eql(signature)
+    expect(@employee.signature).to_not be(signature)
+    expect(TestEmployee.first.read_attribute_before_type_cast(:signature)).to eq(Base64.encode64 raw_signature)
+  end
+end