diff --git a/lib/active_record_doctor/detectors/incorrect_boolean_presence_validation.rb b/lib/active_record_doctor/detectors/incorrect_boolean_presence_validation.rb
index 884b7074..20c2a8ba 100644
--- a/lib/active_record_doctor/detectors/incorrect_boolean_presence_validation.rb
+++ b/lib/active_record_doctor/detectors/incorrect_boolean_presence_validation.rb
@@ -37,7 +37,8 @@ def detect
 
       def has_presence_validator?(model, column)
         model.validators.any? do |validator|
-          validator.kind == :presence && validator.attributes.include?(column.name.to_sym)
+          attributes = validator.attributes.map(&:to_s)
+          validator.kind == :presence && attributes.include?(column.name)
         end
       end
     end
diff --git a/lib/active_record_doctor/detectors/incorrect_length_validation.rb b/lib/active_record_doctor/detectors/incorrect_length_validation.rb
index f19a0767..e7d03f65 100644
--- a/lib/active_record_doctor/detectors/incorrect_length_validation.rb
+++ b/lib/active_record_doctor/detectors/incorrect_length_validation.rb
@@ -33,7 +33,7 @@ def message(model:, attribute:, table:, database_maximum:, model_maximum:)
       def detect
         each_model(except: config(:ignore_models), existing_tables_only: true) do |model|
           each_attribute(model, except: config(:ignore_attributes), type: [:string, :text]) do |column|
-            model_maximum = maximum_allowed_by_validations(model, column.name.to_sym)
+            model_maximum = maximum_allowed_by_validations(model, column.name)
             next if model_maximum == column.limit
 
             problem!(
@@ -49,9 +49,11 @@ def detect
 
       def maximum_allowed_by_validations(model, column)
         length_validator = model.validators.find do |validator|
+          attributes = validator.attributes.map(&:to_s)
+
           validator.kind == :length &&
             validator.options.include?(:maximum) &&
-            validator.attributes.include?(column)
+            attributes.include?(column)
         end
         length_validator ? length_validator.options[:maximum] : nil
       end
diff --git a/lib/active_record_doctor/detectors/missing_non_null_constraint.rb b/lib/active_record_doctor/detectors/missing_non_null_constraint.rb
index 63bfc4b0..e4fd1e3a 100644
--- a/lib/active_record_doctor/detectors/missing_non_null_constraint.rb
+++ b/lib/active_record_doctor/detectors/missing_non_null_constraint.rb
@@ -70,10 +70,10 @@ def non_null_needed?(model, column)
         end
 
         required_presence_validators(model).any? do |validator|
-          attributes = validator.attributes
+          attributes = validator.attributes.map(&:to_s)
 
-          attributes.include?(column.name.to_sym) ||
-            (belongs_to && attributes.include?(belongs_to.name.to_sym))
+          attributes.include?(column.name) ||
+            (belongs_to && attributes.include?(belongs_to.name.to_s))
         end
       end
 
diff --git a/lib/active_record_doctor/detectors/missing_presence_validation.rb b/lib/active_record_doctor/detectors/missing_presence_validation.rb
index e1a5a2c6..57b85e34 100644
--- a/lib/active_record_doctor/detectors/missing_presence_validation.rb
+++ b/lib/active_record_doctor/detectors/missing_presence_validation.rb
@@ -58,8 +58,9 @@ def inclusion_validator_present?(model, column)
           validator_items = inclusion_validator_items(validator)
           return true if validator_items.is_a?(Proc)
 
+          attributes = validator.attributes.map(&:to_s)
           validator.is_a?(ActiveModel::Validations::InclusionValidator) &&
-            validator.attributes.map(&:to_s).include?(column.name) &&
+            attributes.include?(column.name) &&
             !validator_items.include?(nil)
         end
       end
@@ -69,23 +70,26 @@ def exclusion_validator_present?(model, column)
           validator_items = inclusion_validator_items(validator)
           return true if validator_items.is_a?(Proc)
 
+          attributes = validator.attributes.map(&:to_s)
           validator.is_a?(ActiveModel::Validations::ExclusionValidator) &&
-            validator.attributes.include?(column.name.to_sym) &&
+            attributes.include?(column.name) &&
             validator_items.include?(nil)
         end
       end
 
       def presence_validator_present?(model, column)
-        allowed_attributes = [column.name.to_sym]
+        allowed_attributes = [column.name]
 
         belongs_to = model.reflect_on_all_associations(:belongs_to).find do |reflection|
           reflection.foreign_key == column.name
         end
-        allowed_attributes << belongs_to.name.to_sym if belongs_to
+        allowed_attributes << belongs_to.name.to_s if belongs_to
 
         model.validators.any? do |validator|
+          attributes = validator.attributes.map(&:to_s)
+
           validator.is_a?(ActiveRecord::Validations::PresenceValidator) &&
-            (validator.attributes & allowed_attributes).present?
+            (attributes & allowed_attributes).present?
         end
       end
 
diff --git a/test/active_record_doctor/detectors/incorrect_length_validation_test.rb b/test/active_record_doctor/detectors/incorrect_length_validation_test.rb
index f30b9cc4..355e491e 100644
--- a/test/active_record_doctor/detectors/incorrect_length_validation_test.rb
+++ b/test/active_record_doctor/detectors/incorrect_length_validation_test.rb
@@ -6,7 +6,7 @@ def test_validation_and_limit_equal_is_ok
       t.string :email, limit: 64
       t.string :name, limit: 32
     end.define_model do
-      validates :email, length: { maximum: 64 }
+      validates "email", length: { maximum: 64 } # use a string on purpose
       validates :name, length: { maximum: 32 }
     end