Object#block in __pry__
(pry):47
Student#name_changed?
$GemPath0/gems/activemodel-5.1.2/lib/active_model/attribute_methods.rb:383
Student#attribute_changed?
$GemPath0/gems/activerecord-5.1.2/lib/active_record/attribute_methods/dirty.rb:224
Student#emit_warning_if_needed
$GemPath0/gems/activerecord-5.1.2/lib/active_record/attribute_methods/dirty.rb:248
Student#mutation_tracker
$GemPath0/gems/activerecord-5.1.2/lib/active_record/attribute_methods/dirty.rb:241
Student#mutations_from_database
$GemPath0/gems/activerecord-5.1.2/lib/active_record/attribute_methods/dirty.rb:260
BasicObject#equal?
$GemPath0/gems/activerecord-5.1.2/lib/active_record/attribute_methods/dirty.rb:249
Student#attribute_changed?
$GemPath0/gems/activemodel-5.1.2/lib/active_model/dirty.rb:180
Student#changes_include?
$GemPath0/gems/activerecord-5.1.2/lib/active_record/attribute_methods/dirty.rb:267
Student#changes_include?
$GemPath0/gems/activemodel-5.1.2/lib/active_model/dirty.rb:204
Student#changed_attributes
$GemPath0/gems/activemodel-5.1.2/lib/active_model/dirty.rb:175
ActiveSupport::HashWithIndifferentAccess#key?
$GemPath0/gems/activesupport-5.1.2/lib/active_support/hash_with_indifferent_access.rb:153
ActiveSupport::HashWithIndifferentAccess#convert_key
$GemPath0/gems/activesupport-5.1.2/lib/active_support/hash_with_indifferent_access.rb:288
Kernel#kind_of?
$GemPath0/gems/activesupport-5.1.2/lib/active_support/hash_with_indifferent_access.rb:289
Hash#key?
$GemPath0/gems/activesupport-5.1.2/lib/active_support/hash_with_indifferent_access.rb:154
Student#mutation_tracker
$GemPath0/gems/activerecord-5.1.2/lib/active_record/attribute_methods/dirty.rb:241
ActiveRecord::AttributeMutationTracker#changed?
$GemPath0/gems/activerecord-5.1.2/lib/active_record/attribute_mutation_tracker.rb:38
String#to_s
$GemPath0/gems/activerecord-5.1.2/lib/active_record/attribute_mutation_tracker.rb:39
Set#include?
/home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/set.rb:232
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::FromUser#changed?
$GemPath0/gems/activerecord-5.1.2/lib/active_record/attribute.rb:54
ActiveRecord::Attribute::FromUser#changed_from_assignment?
$GemPath0/gems/activerecord-5.1.2/lib/active_record/attribute.rb:153
ActiveRecord::Attribute::FromUser#original_value
$GemPath0/gems/activerecord-5.1.2/lib/active_record/attribute.rb:42
ActiveRecord::Attribute::FromDatabase#original_value
$GemPath0/gems/activerecord-5.1.2/lib/active_record/attribute.rb:42
ActiveRecord::Attribute::FromDatabase#type_cast
$GemPath0/gems/activerecord-5.1.2/lib/active_record/attribute.rb:162
ActiveModel::Type::String#deserialize
$GemPath0/gems/activemodel-5.1.2/lib/active_model/type/value.rb:21
ActiveModel::Type::String#cast
$GemPath0/gems/activemodel-5.1.2/lib/active_model/type/value.rb:35
Kernel#nil?
$GemPath0/gems/activemodel-5.1.2/lib/active_model/type/value.rb:36
ActiveModel::Type::String#cast_value
$GemPath0/gems/activemodel-5.1.2/lib/active_model/type/string.rb:14
Module#===
$GemPath0/gems/activemodel-5.1.2/lib/active_model/type/string.rb:16
Class#new
$GemPath0/gems/activemodel-5.1.2/lib/active_model/type/string.rb:16
String#initialize
$GemPath0/gems/activemodel-5.1.2/lib/active_model/type/string.rb:16
ActiveRecord::Attribute::FromUser#value
$GemPath0/gems/activerecord-5.1.2/lib/active_record/attribute.rb:36
ActiveModel::Type::String#changed?
$GemPath0/gems/activemodel-5.1.2/lib/active_model/type/value.rb:62