diff --git a/app/controllers/forest_liana/associations_controller.rb b/app/controllers/forest_liana/associations_controller.rb
index b56770ec..a7186ae5 100644
--- a/app/controllers/forest_liana/associations_controller.rb
+++ b/app/controllers/forest_liana/associations_controller.rb
@@ -15,7 +15,7 @@ def index
 
         respond_to do |format|
           format.json { render_jsonapi(getter) }
-          format.csv { render_csv(getter, @association.klass) }
+          format.csv { render_csv(getter, SchemaUtils.association_ref(@association)) }
         end
       rescue => error
         FOREST_LOGGER.error "Association Index error: #{error}\n#{format_stacktrace(error)}"
@@ -104,21 +104,21 @@ def resource_params
     end
 
     def is_sti_model?
-      @is_sti_model ||= (@association.klass.inheritance_column.present? &&
-        @association.klass.columns.any? { |column| column.name == @association.klass.inheritance_column })
+      @is_sti_model ||= (SchemaUtils.association_ref(@association).inheritance_column.present? &&
+        SchemaUtils.association_ref(@association).columns.any? { |column| column.name == SchemaUtils.association_ref(@association).inheritance_column })
     end
 
     def get_record record
-      is_sti_model? ? record.becomes(@association.klass) : record
+      is_sti_model? ? record.becomes(SchemaUtils.association_ref(@association)) : record
     end
 
     def render_jsonapi getter
-      fields_to_serialize = fields_per_model(params[:fields], @association.klass)
+      fields_to_serialize = fields_per_model(params[:fields], SchemaUtils.association_ref(@association))
       records = getter.records.map { |record| get_record(record) }
 
       includes = getter.includes_for_serialization
       if fields_to_serialize && includes.length > 0
-        association_name = ForestLiana.name_for(@association.klass)
+        association_name = ForestLiana.name_for(SchemaUtils.association_ref(@association))
         fields_to_serialize[association_name] += ",#{includes.join(',')}"
       end
 
diff --git a/app/deserializers/forest_liana/resource_deserializer.rb b/app/deserializers/forest_liana/resource_deserializer.rb
index daf3a46a..576e6b67 100644
--- a/app/deserializers/forest_liana/resource_deserializer.rb
+++ b/app/deserializers/forest_liana/resource_deserializer.rb
@@ -57,13 +57,13 @@ def extract_relationships
             #if data.blank?
               #@attributes[name] = nil
             #else
-              #@attributes[name] = association.klass.find(data[:id])
+              #@attributes[name] = SchemaUtils.association_ref(association).find(data[:id])
             #end
 
             # ActionController::Parameters do not inherit from Hash anymore
             # since Rails 5.
             if (data.is_a?(Hash) || data.is_a?(ActionController::Parameters)) && data[:id]
-              @attributes[name] = association.klass.find(data[:id])
+              @attributes[name] = SchemaUtils.association_ref(association).find(data[:id])
             elsif data.blank?
               @attributes[name] = nil
             end
diff --git a/app/helpers/forest_liana/query_helper.rb b/app/helpers/forest_liana/query_helper.rb
index ce359775..7d7c7fc6 100644
--- a/app/helpers/forest_liana/query_helper.rb
+++ b/app/helpers/forest_liana/query_helper.rb
@@ -2,7 +2,7 @@ module ForestLiana
   module QueryHelper
     def self.get_one_associations(resource)
       SchemaUtils.one_associations(resource)
-        .select { |association| SchemaUtils.model_included?(association.klass) }
+        .select { |association| !SchemaUtils.polymorphic?(association) && SchemaUtils.model_included?(association.klass) }
     end
 
     def self.get_one_association_names_symbol(resource)
diff --git a/app/serializers/forest_liana/serializer_factory.rb b/app/serializers/forest_liana/serializer_factory.rb
index 91c98f84..93d8dac4 100644
--- a/app/serializers/forest_liana/serializer_factory.rb
+++ b/app/serializers/forest_liana/serializer_factory.rb
@@ -265,7 +265,7 @@ def mixpanel_integration?
 
         SchemaUtils.associations(active_record_class).each do |a|
           begin
-            if SchemaUtils.model_included?(a.klass)
+            if SchemaUtils.model_included?(SchemaUtils.association_ref(a))
               serializer.send(serializer_association(a), a.name) {
                 if [:has_one, :belongs_to].include?(a.macro)
                   begin
diff --git a/app/services/forest_liana/belongs_to_updater.rb b/app/services/forest_liana/belongs_to_updater.rb
index e36ee2bd..519ab2e5 100644
--- a/app/services/forest_liana/belongs_to_updater.rb
+++ b/app/services/forest_liana/belongs_to_updater.rb
@@ -13,7 +13,7 @@ def initialize(resource, association, params)
     def perform
       begin
         @record = @resource.find(@params[:id])
-        new_value = @association.klass.find(@data[:id]) if @data && @data[:id]
+        new_value = SchemaUtils.association_ref(@association).find(@data[:id]) if @data && @data[:id]
         @record.send("#{@association.name}=", new_value)
 
         @record.save
diff --git a/app/services/forest_liana/has_many_associator.rb b/app/services/forest_liana/has_many_associator.rb
index bef8faf5..33ae8db1 100644
--- a/app/services/forest_liana/has_many_associator.rb
+++ b/app/services/forest_liana/has_many_associator.rb
@@ -13,7 +13,7 @@ def perform
 
       if @data.is_a?(Array)
         @data.each do |record_added|
-          associated_records << @association.klass.find(record_added[:id])
+          associated_records << SchemaUtils.association_ref(@association).find(record_added[:id])
         end
       end
     end
diff --git a/app/services/forest_liana/has_many_dissociator.rb b/app/services/forest_liana/has_many_dissociator.rb
index 905acfc2..fa771120 100644
--- a/app/services/forest_liana/has_many_dissociator.rb
+++ b/app/services/forest_liana/has_many_dissociator.rb
@@ -25,13 +25,13 @@ def perform
       if !record_ids.nil? && record_ids.any?
         if remove_association
           record_ids.each do |id|
-            associated_records.delete(@association.klass.find(id))
+            associated_records.delete(SchemaUtils.association_ref(@association).find(id))
           end
         end
 
         if @with_deletion
-          record_ids = record_ids.select { |record_id| @association.klass.exists?(record_id) }
-          @association.klass.destroy(record_ids)
+          record_ids = record_ids.select { |record_id| SchemaUtils.association_ref(@association).exists?(record_id) }
+          SchemaUtils.association_ref(@association).destroy(record_ids)
         end
       end
     end
diff --git a/app/services/forest_liana/has_many_getter.rb b/app/services/forest_liana/has_many_getter.rb
index ec7fc1eb..c6911aee 100644
--- a/app/services/forest_liana/has_many_getter.rb
+++ b/app/services/forest_liana/has_many_getter.rb
@@ -37,10 +37,10 @@ def records
     private
 
     def compute_includes
-      @includes = @association.klass
+      @includes = SchemaUtils.association_ref(@association)
         .reflect_on_all_associations
         .select do |association|
-          inclusion = !association.options[:polymorphic] &&
+          inclusion = !SchemaUtils.polymorphic?(association) &&
             SchemaUtils.model_included?(association.klass) &&
             [:belongs_to, :has_and_belongs_to_many].include?(association.macro)
 
diff --git a/app/services/forest_liana/leaderboard_stat_getter.rb b/app/services/forest_liana/leaderboard_stat_getter.rb
index b331df44..6ddf49e9 100644
--- a/app/services/forest_liana/leaderboard_stat_getter.rb
+++ b/app/services/forest_liana/leaderboard_stat_getter.rb
@@ -3,7 +3,7 @@ class LeaderboardStatGetter < StatGetter
     def initialize(resource, params)
       @resource = resource
       @params = params
-      @model_relationship =  @resource.reflect_on_association(@params[:relationship_field]).klass
+      @model_relationship = @resource.reflect_on_association(@params[:relationship_field]).klass
       compute_includes()
       @label_field = @params[:label_field]
       @aggregate = @params[:aggregate].downcase
diff --git a/app/services/forest_liana/resource_creator.rb b/app/services/forest_liana/resource_creator.rb
index 1b9c4d2d..1c16c286 100644
--- a/app/services/forest_liana/resource_creator.rb
+++ b/app/services/forest_liana/resource_creator.rb
@@ -18,7 +18,7 @@ def perform
         end
         set_has_many_relationships
       rescue ActiveRecord::StatementInvalid => exception
-        # NOTICE: SQL request cannot be executed properly
+        # NOTICE: SQL request cannot be executed properly
         @errors = [{ detail: exception.cause.error }]
       rescue ForestLiana::Errors::SerializeAttributeBadFormat => exception
         @errors = [{ detail: exception.message }]
@@ -41,7 +41,7 @@ def set_has_many_relationships
             if data.is_a?(Array)
               data.each do |x|
                 existing_records = @record.send(name)
-                new_record = association.klass.find(x[:id])
+                new_record = SchemaUtils.association_ref(association).find(x[:id])
                 if !existing_records.include?(new_record)
                   existing_records << new_record
                 end
diff --git a/app/services/forest_liana/resources_getter.rb b/app/services/forest_liana/resources_getter.rb
index e73623ce..abbf1f1a 100644
--- a/app/services/forest_liana/resources_getter.rb
+++ b/app/services/forest_liana/resources_getter.rb
@@ -94,7 +94,7 @@ def compute_includes
           .map { |field| field.split('.').first.to_sym }
 
         includes_has_many = SchemaUtils.many_associations(@resource)
-          .select { |association| SchemaUtils.model_included?(association.klass) }
+          .select { |association| SchemaUtils.model_included?(SchemaUtils.association_ref(association)) }
           .map(&:name)
 
         includes_for_smart_search = includes_for_smart_search & includes_has_many
diff --git a/app/services/forest_liana/schema_adapter.rb b/app/services/forest_liana/schema_adapter.rb
index b5daa051..562d4ace 100644
--- a/app/services/forest_liana/schema_adapter.rb
+++ b/app/services/forest_liana/schema_adapter.rb
@@ -240,7 +240,7 @@ def add_associations
       SchemaUtils.associations(@model).each do |association|
         begin
           # NOTICE: Delete the association if the targeted model is excluded.
-          if !SchemaUtils.model_included?(association.klass)
+          if !SchemaUtils.model_included?(SchemaUtils.association_ref(association))
             field = collection.fields.find do |x|
               x[:field] == association.foreign_key
             end
@@ -272,14 +272,27 @@ def inverse_of(association)
         automatic_inverse_of(association)
     end
 
+    def polymorphic_inverse_of(association)
+      active_models = ActiveRecord::Base.descendants
+      active_models.each do |model|
+        a = model.reflect_on_all_associations.select{|a| a.options[:as] == association.name }
+        unless a.empty?
+          return a.first.name
+        end
+      end
+    end
+
     def automatic_inverse_of(association)
-      name = association.active_record.name.demodulize.underscore
+      if SchemaUtils.polymorphic?(association)
+        polymorphic_inverse_of(association)
+      else
+        name = association.active_record.name.demodulize.underscore
+        inverse_association = association.klass.reflections.keys.find do |k|
+          k.to_s == name || k.to_s == name.pluralize
+        end
 
-      inverse_association = association.klass.reflections.keys.find do |k|
-        k.to_s == name || k.to_s == name.pluralize
+        inverse_association.try(:to_s)
       end
-
-      inverse_association.try(:to_s)
     end
 
     def get_schema_for_column(column)
@@ -313,7 +326,7 @@ def get_schema_for_association(association)
         field: association.name.to_s,
         type: get_type_for_association(association),
         relationship: get_relationship_type(association),
-        reference: "#{ForestLiana.name_for(association.klass)}.id",
+        reference: "#{ForestLiana.name_for(SchemaUtils.association_ref(association))}.id",
         inverse_of: inverse_of(association),
         is_filterable: !is_many_association(association),
         is_sortable: true,
@@ -500,7 +513,7 @@ def add_validations(column_schema, column)
     end
 
     def get_reference_for(association)
-      if association.options[:polymorphic] == true
+      if SchemaUtils.polymorphic?(association)
         '*.id'
       else
         "#{ForestLiana.name_for(association.klass)}.id"
diff --git a/app/services/forest_liana/schema_utils.rb b/app/services/forest_liana/schema_utils.rb
index d973f4b6..d39c0416 100644
--- a/app/services/forest_liana/schema_utils.rb
+++ b/app/services/forest_liana/schema_utils.rb
@@ -4,7 +4,7 @@ class SchemaUtils
     def self.associations(active_record_class)
       active_record_class.reflect_on_all_associations.select do |association|
         begin
-          !polymorphic?(association) && !is_active_type?(association.klass)
+          !is_active_type?(SchemaUtils.association_ref(association))
         rescue
           FOREST_LOGGER.warn "Unknown association #{association.name} on class #{active_record_class.name}"
           false
@@ -58,6 +58,14 @@ def self.polymorphic?(association)
       association.options[:polymorphic]
     end
 
+    def self.association_ref(association)
+      if self.polymorphic?(association)
+        association.active_record
+      else
+        association.klass
+      end
+    end
+
     def self.find_model_from_abstract_class(abstract_class, collection_name)
       abstract_class.subclasses.find do |subclass|
         if subclass.abstract_class?