ignore default value for jsonb

lib/annotate/annotate_models.rb

@@ -135,12 +135,13 @@ module AnnotateModels
       cols = cols.sort_by(&:name) if(options[:sort])
       cols = classified_sort(cols) if(options[:classified_sort])
       cols.each do |col|
+        col_type = (col.type || col.sql_type).to_s
+
         attrs = []
-        attrs << "default(#{schema_default(klass, col)})" unless col.default.nil?
+        attrs << "default(#{schema_default(klass, col)})" unless col.default.nil? || col_type == "jsonb"
         attrs << "not null" unless col.null
         attrs << "primary key" if klass.primary_key && (klass.primary_key.is_a?(Array) ? klass.primary_key.collect{|c|c.to_sym}.include?(col.name.to_sym) : col.name.to_sym == klass.primary_key.to_sym)
 
-        col_type = (col.type || col.sql_type).to_s
         if col_type == "decimal"
           col_type << "(#{col.precision}, #{col.scale})"
         elsif col_type != "spatial"