Fix #264

lib/closure_tree/model.rb

@@ -13,7 +13,7 @@ module Model
         touch: _ct.options[:touch],
         optional: true)
 
-      order_by_generations = Arel.sql("#{_ct.quoted_hierarchy_table_name}.generations ASC")
+      order_by_generations = -> { Arel.sql("#{_ct.quoted_hierarchy_table_name}.generations ASC") }
 
       has_many :children, *_ct.has_many_with_order_option(
         class_name: _ct.model_class.to_s,

lib/closure_tree/support.rb

@@ -82,12 +82,15 @@ def belongs_to_with_optional_option(opts)
 
     # lambda-ize the order, but don't apply the default order_option
     def has_many_without_order_option(opts)
-        [lambda { order(opts[:order]) }, opts.except(:order)]
+      [lambda { order(opts[:order].call) }, opts.except(:order)]
     end
 
     def has_many_with_order_option(opts)
       order_options = [opts[:order], order_by].compact
-      [lambda { order(order_options) }, opts.except(:order)]
+      [lambda {
+        order_options = order_options.map { |o| o.is_a?(Proc) ? o.call : o }
+        order(order_options)
+      }, opts.except(:order)]
     end
 
     def ids_from(scope)

lib/closure_tree/support_flags.rb

@@ -17,6 +17,9 @@ def order_option?
     end
 
     def order_is_numeric?
+      # skip if database is not connected.
+      return false unless ::ActiveRecord::Base.connected?
+
       # The table might not exist yet (in the case of ActiveRecord::Observer use, see issue 32)
       return false if !order_option? || !model_class.table_exists?
       c = model_class.columns_hash[order_column]