Remove last usage of _reflections in favor of reflect_on_association.

- better compatible with newer Rails, since it casts to needed type on its own

app/components/avo/fields/belongs_to_field/autocomplete_component.rb

@@ -41,7 +41,7 @@ def field_value
   end
 
   def reflection_class
-    has_polymorphic_association? ? polymorphic_class : @resource.model_class._reflections[@field.id.to_s].klass
+    has_polymorphic_association? ? polymorphic_class : @resource.model_class.reflect_on_association(@field.id).klass
   end
 
   private

app/components/avo/fields/has_one_field/show_component.rb

@@ -36,7 +36,7 @@ def can_see_the_create_button?
   end
 
   def create_path
-    association_id = @field.resource.model_class._reflections[@field.id.to_s].inverse_of.name
+    association_id = @field.resource.model_class.reflect_on_association(@field.id).inverse_of.name
 
     args = {
       via_relation: association_id,

app/controllers/avo/application_controller.rb

@@ -226,7 +226,7 @@ def related_resource
 
       return field.use_resource if field&.use_resource.present?
 
-      reflection = @model._reflections[params[:related_name]]
+      reflection = @model.class.reflect_on_association(params[:related_name])
 
       reflected_model = reflection.klass
 

app/controllers/avo/associations_controller.rb

@@ -101,7 +101,7 @@ def order
     private
 
     def set_reflection
-      @reflection = @model._reflections[params[:related_name].to_s]
+      @reflection = @model.class.reflect_on_association(params[:related_name])
     end
 
     def set_attachment_class
@@ -127,7 +127,7 @@ def attachment_id
     end
 
     def reflection_class
-      reflection = @model._reflections[params[:related_name]]
+      reflection = @model.class.reflect_on_association(params[:related_name])
 
       klass = reflection.class.name.demodulize.to_s
       klass = reflection.through_reflection.class.name.demodulize.to_s if klass == "ThroughReflection"

app/controllers/avo/base_controller.rb

@@ -134,7 +134,7 @@ def create
 
       # This means that the record has been created through another parent record and we need to attach it somehow.
       if params[:via_resource_id].present? && params[:via_belongs_to_resource_class].nil?
-        @reflection = @model._reflections[params[:via_relation]]
+        @reflection = @model.class.reflect_on_association(params[:via_relation])
         # Figure out what kind of association does the record have with the parent record
 
         # Fills in the required infor for belongs_to and has_many