diff --git a/.rubocop.yml b/.rubocop.yml
index 5478a02ce..55b0163a6 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -242,6 +242,7 @@ Metrics/ClassLength:
     - 'packages/forest_admin_agent/lib/forest_admin_agent/routes/action/actions.rb'
     - 'packages/forest_admin_agent/lib/forest_admin_agent/routes/resources/related/update_related.rb'
     - 'packages/forest_admin_agent/lib/forest_admin_agent/utils/schema/frontend_validation_utils.rb'
+    - 'packages/forest_admin_agent/lib/forest_admin_agent/utils/query_string_parser.rb'
     - 'packages/forest_admin_datasource_active_record/lib/forest_admin_datasource_active_record/utils/query.rb'
     - 'packages/forest_admin_datasource_active_record/lib/forest_admin_datasource_active_record/collection.rb'
     - 'packages/forest_admin_datasource_customizer/lib/forest_admin_datasource_customizer/collection_customizer.rb'
diff --git a/packages/forest_admin_agent/lib/forest_admin_agent/utils/query_string_parser.rb b/packages/forest_admin_agent/lib/forest_admin_agent/utils/query_string_parser.rb
index 747f38078..56ca9718a 100644
--- a/packages/forest_admin_agent/lib/forest_admin_agent/utils/query_string_parser.rb
+++ b/packages/forest_admin_agent/lib/forest_admin_agent/utils/query_string_parser.rb
@@ -69,7 +69,10 @@ def self.parse_projection(collection, args)
           end
         end
 
-        Projection.new(fields)
+        projection = Projection.new(fields)
+        ForestAdminDatasourceToolkit::Validations::ProjectionValidator.validate?(collection, projection)
+
+        projection
       end
 
       def self.parse_projection_with_pks(collection, args)
diff --git a/packages/forest_admin_datasource_customizer/lib/forest_admin_datasource_customizer/decorators/computed/utils/flattener.rb b/packages/forest_admin_datasource_customizer/lib/forest_admin_datasource_customizer/decorators/computed/utils/flattener.rb
index bd17af2fe..add0941ee 100644
--- a/packages/forest_admin_datasource_customizer/lib/forest_admin_datasource_customizer/decorators/computed/utils/flattener.rb
+++ b/packages/forest_admin_datasource_customizer/lib/forest_admin_datasource_customizer/decorators/computed/utils/flattener.rb
@@ -31,7 +31,10 @@ def self.with_null_marker(projection)
 
           def self.flatten(records, projection)
             projection.map do |field|
-              parts = field.split(':')
+              # because we don't compute computed fields over polymorphic relation (only usage of *),
+              # we decide to consider the all record as a value instead of a relation
+              parts = field.split(':').reject { |part| part == '*' }
+
               records.map do |record|
                 value = record
 
@@ -63,7 +66,7 @@ def self.un_flatten(flatten, projection)
               records[record_index] = {}
 
               projection.each_with_index do |path, path_index|
-                parts = path.split(':').reject { |part| part == MARKER_NAME }
+                parts = path.split(':').reject { |part| [MARKER_NAME, '*'].include?(part) }
                 value = flatten[path_index][record_index]
 
                 # Ignore undefined values.
diff --git a/packages/forest_admin_datasource_customizer/lib/forest_admin_datasource_customizer/decorators/publication/publication_collection_decorator.rb b/packages/forest_admin_datasource_customizer/lib/forest_admin_datasource_customizer/decorators/publication/publication_collection_decorator.rb
index 8685b1417..ea03a8f32 100644
--- a/packages/forest_admin_datasource_customizer/lib/forest_admin_datasource_customizer/decorators/publication/publication_collection_decorator.rb
+++ b/packages/forest_admin_datasource_customizer/lib/forest_admin_datasource_customizer/decorators/publication/publication_collection_decorator.rb
@@ -70,7 +70,8 @@ def published?(name)
             )
           end
 
-          if field.type == 'OneToOne' || field.type == 'OneToMany'
+          if field.type == 'OneToOne' || field.type == 'OneToMany' ||
+             field.type == 'PolymorphicOneToOne' || field.type == 'PolymorphicOneToMany'
             return (
               datasource.published?(field.foreign_collection) &&
               datasource.get_collection(field.foreign_collection).published?(field.origin_key) &&
diff --git a/packages/forest_admin_datasource_customizer/lib/forest_admin_datasource_customizer/decorators/rename_field/rename_field_collection_decorator.rb b/packages/forest_admin_datasource_customizer/lib/forest_admin_datasource_customizer/decorators/rename_field/rename_field_collection_decorator.rb
index 74e331f94..dbfbe40d0 100644
--- a/packages/forest_admin_datasource_customizer/lib/forest_admin_datasource_customizer/decorators/rename_field/rename_field_collection_decorator.rb
+++ b/packages/forest_admin_datasource_customizer/lib/forest_admin_datasource_customizer/decorators/rename_field/rename_field_collection_decorator.rb
@@ -52,6 +52,8 @@ def refine_schema(sub_schema)
           fields = {}
           schema = sub_schema.dup
 
+          # we don't handle schema modification for polymorphic many to one and reverse relations because
+          # we forbid to rename foreign key and type fields on polymorphic many to one
           sub_schema[:fields].each do |old_name, old_schema|
             case old_schema.type
             when 'ManyToOne'
@@ -160,7 +162,11 @@ def path_to_child_collection(path)
             paths = path.split(':')
             relation_name = paths[0]
             relation_schema = schema[:fields][relation_name]
-            if relation_schema.type != 'PolymorphicManyToOne'
+            if relation_schema.type == 'PolymorphicManyToOne'
+              relation_name = to_child_collection[relation_name]
+
+              return "#{relation_name}:#{paths[1]}"
+            else
               relation = datasource.get_collection(relation_schema.foreign_collection)
               child_field = to_child_collection[relation_name] || relation_name
 
@@ -188,7 +194,8 @@ def record_from_child_collection(child_record)
             field_schema = schema[:fields][field]
 
             # Perform the mapping, recurse for relation
-            if field_schema.type == 'Column' || field_schema.type == 'PolymorphicManyToOne' || value.nil?
+            if field_schema.type == 'Column' || value.nil? || field_schema.type == 'PolymorphicManyToOne' ||
+               field_schema.type == 'PolymorphicOneToOne'
               record[field] = value
             else
               relation = datasource.get_collection(field_schema.foreign_collection)
diff --git a/packages/forest_admin_datasource_customizer/lib/forest_admin_datasource_customizer/decorators/search/search_collection_decorator.rb b/packages/forest_admin_datasource_customizer/lib/forest_admin_datasource_customizer/decorators/search/search_collection_decorator.rb
index ca60fe2a3..ed32f323e 100644
--- a/packages/forest_admin_datasource_customizer/lib/forest_admin_datasource_customizer/decorators/search/search_collection_decorator.rb
+++ b/packages/forest_admin_datasource_customizer/lib/forest_admin_datasource_customizer/decorators/search/search_collection_decorator.rb
@@ -104,7 +104,7 @@ def get_fields(collection, extended)
           collection.schema[:fields].each do |name, field|
             fields.push([name, field]) if field.type == 'Column'
 
-            if field.type == 'PolymorphicManyToOne'
+            if field.type == 'PolymorphicManyToOne' && extended
               ForestAdminAgent::Facades::Container.logger.log(
                 'Debug',
                 "We're not searching through #{self.name}.#{name} because it's a polymorphic relation. " \
diff --git a/packages/forest_admin_datasource_toolkit/lib/forest_admin_datasource_toolkit/utils/collection.rb b/packages/forest_admin_datasource_toolkit/lib/forest_admin_datasource_toolkit/utils/collection.rb
index 1f5ac3869..606350154 100644
--- a/packages/forest_admin_datasource_toolkit/lib/forest_admin_datasource_toolkit/utils/collection.rb
+++ b/packages/forest_admin_datasource_toolkit/lib/forest_admin_datasource_toolkit/utils/collection.rb
@@ -14,6 +14,8 @@ def self.get_inverse_relation(collection, relation_name)
         inverse = foreign_collection.schema[:fields].select do |_name, field|
           if polymorphic_relations.include?(relation_field.type)
             field.is_a?(PolymorphicManyToOneSchema) &&
+              field.foreign_key_type_field == relation_field.origin_type_field &&
+              field.foreign_key == relation_field.origin_key &&
               field.foreign_collections.include?(collection.name)
           else
             field.is_a?(RelationSchema) &&
diff --git a/packages/forest_admin_datasource_toolkit/lib/forest_admin_datasource_toolkit/validations/field_validator.rb b/packages/forest_admin_datasource_toolkit/lib/forest_admin_datasource_toolkit/validations/field_validator.rb
index 6cc120846..7cb4d1e5f 100644
--- a/packages/forest_admin_datasource_toolkit/lib/forest_admin_datasource_toolkit/validations/field_validator.rb
+++ b/packages/forest_admin_datasource_toolkit/lib/forest_admin_datasource_toolkit/validations/field_validator.rb
@@ -22,19 +22,26 @@ def self.validate(collection, field, values = nil)
             end
           end
         else
-          prefix = field[0, dot_index]
+          prefix, suffix = field.split(':')
           schema = collection.schema[:fields][prefix]
 
           raise Exceptions::ValidationError, "Relation not found: '#{collection.name}.#{prefix}'" if schema.nil?
 
-          if schema.type != 'ManyToOne' && schema.type != 'OneToOne'
+          if schema.type == 'PolymorphicManyToOne' && suffix != '*'
+            raise Exceptions::ValidationError, "Unexpected nested field #{suffix} under generic relation: #{collection.name}.#{prefix}"
+          end
+
+          if schema.type != 'ManyToOne' && schema.type != 'OneToOne' && schema.type != 'PolymorphicManyToOne' &&
+             schema.type != 'PolymorphicOneToOne'
             raise Exceptions::ValidationError,
-                  "Unexpected field type: '#{collection.name}.#{prefix}' (found '#{schema.type}' expected 'ManyToOne' or 'OneToOne')"
+                  "Unexpected field type: '#{collection.name}.#{prefix}' (found '#{schema.type}')"
           end
 
-          suffix = field[dot_index + 1, field.length - dot_index - 1]
-          association = collection.datasource.get_collection(schema.foreign_collection)
-          validate(association, suffix, values)
+          if schema.type != 'PolymorphicManyToOne'
+            suffix = field[dot_index + 1, field.length - dot_index - 1]
+            association = collection.datasource.get_collection(schema.foreign_collection)
+            validate(association, suffix, values)
+          end
         end
       end
 
diff --git a/packages/forest_admin_datasource_toolkit/spec/lib/forest_admin_datasource_toolkit/validations/field_validator_spec.rb b/packages/forest_admin_datasource_toolkit/spec/lib/forest_admin_datasource_toolkit/validations/field_validator_spec.rb
index 6f2c273ef..e887cc2a3 100644
--- a/packages/forest_admin_datasource_toolkit/spec/lib/forest_admin_datasource_toolkit/validations/field_validator_spec.rb
+++ b/packages/forest_admin_datasource_toolkit/spec/lib/forest_admin_datasource_toolkit/validations/field_validator_spec.rb
@@ -77,7 +77,7 @@ module Validations
               described_class.validate(@collection_cars,
                                        'id:address')
             end.to raise_error(ValidationError,
-                               "🌳🌳🌳 Unexpected field type: 'cars.id' (found 'Column' expected 'ManyToOne' or 'OneToOne')")
+                               "🌳🌳🌳 Unexpected field type: 'cars.id' (found 'Column')")
           end
         end