• Object#block in <main> (pry):17
  • Student#[] $GemPath0/gems/activerecord-5.1.2/lib/active_record/attribute_methods.rb:344
    • Student#read_attribute $GemPath0/gems/activerecord-5.1.2/lib/active_record/attribute_methods/read.rb:50
      • Kernel#class $GemPath0/gems/activerecord-5.1.2/lib/active_record/attribute_methods/read.rb:51
      • Student.attribute_alias? $GemPath0/gems/activemodel-5.1.2/lib/active_model/attribute_methods.rb:218
        • Student.attribute_aliases -> block (4 levels) in class_attribute $GemPath0/gems/activesupport-5.1.2/lib/active_support/core_ext/class/attribute.rb:90
          • Student.block (4 levels) in class_attribute $GemPath0/gems/activesupport-5.1.2/lib/active_support/core_ext/class/attribute.rb:90
        • Symbol#to_s $GemPath0/gems/activemodel-5.1.2/lib/active_model/attribute_methods.rb:219
        • Hash#key? $GemPath0/gems/activemodel-5.1.2/lib/active_model/attribute_methods.rb:219
      • Symbol#to_s $GemPath0/gems/activerecord-5.1.2/lib/active_record/attribute_methods/read.rb:54
      • Student#_read_attribute $GemPath0/gems/activerecord-5.1.2/lib/active_record/attribute_methods/read.rb:70
        • String#to_s $GemPath0/gems/activerecord-5.1.2/lib/active_record/attribute_methods/read.rb:71
        • ActiveRecord::AttributeSet#fetch_value $GemPath0/gems/activerecord-5.1.2/lib/active_record/attribute_set.rb:44
          • ActiveRecord::AttributeSet#[] $GemPath0/gems/activerecord-5.1.2/lib/active_record/attribute_set.rb:12
            • ActiveRecord::LazyAttributeHash#[] $GemPath0/gems/activerecord-5.1.2/lib/active_record/attribute_set/builder.rb:41
          • ActiveRecord::Attribute::FromDatabase#value $GemPath0/gems/activerecord-5.1.2/lib/active_record/attribute.rb:36