• Object#block in __pry__ (pry):57
    • Student#__temp__16c6961637f5e616d65637 $GemPath0/gems/activerecord-5.1.2/lib/active_record/attribute_methods/read.rb:34
      • 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::LazyAttributeHash#assign_default_value $GemPath0/gems/activerecord-5.1.2/lib/active_record/attribute_set/builder.rb:112
                • Hash#fetch $GemPath0/gems/activerecord-5.1.2/lib/active_record/attribute_set/builder.rb:113
                • Hash#fetch $GemPath0/gems/activerecord-5.1.2/lib/active_record/attribute_set/builder.rb:115
                • ActiveRecord::Attribute.from_database $GemPath0/gems/activerecord-5.1.2/lib/active_record/attribute.rb:4
                  • Class#new $GemPath0/gems/activerecord-5.1.2/lib/active_record/attribute.rb:5
                    • ActiveRecord::Attribute::FromDatabase#initialize $GemPath0/gems/activerecord-5.1.2/lib/active_record/attribute.rb:29
          • ActiveRecord::Attribute::FromDatabase#value $GemPath0/gems/activerecord-5.1.2/lib/active_record/attribute.rb:36
            • ActiveRecord::Attribute::FromDatabase#type_cast $GemPath0/gems/activerecord-5.1.2/lib/active_record/attribute.rb:162
              • ActiveRecord::Type::Serialized#deserialize $GemPath0/gems/activerecord-5.1.2/lib/active_record/type/serialized.rb:16
                • ActiveRecord::Type::Serialized#default_value? $GemPath0/gems/activerecord-5.1.2/lib/active_record/type/serialized.rb:54
                  • ActiveRecord::Coders::YAMLColumn#load $GemPath0/gems/activerecord-5.1.2/lib/active_record/coders/yaml_column.rb:21
                    • NilClass#nil? $GemPath0/gems/activerecord-5.1.2/lib/active_record/coders/yaml_column.rb:22
                    • Class#new $GemPath0/gems/activerecord-5.1.2/lib/active_record/coders/yaml_column.rb:22
                      • Array#initialize $GemPath0/gems/activerecord-5.1.2/lib/active_record/coders/yaml_column.rb:22
                  • String#== $GemPath0/gems/activerecord-5.1.2/lib/active_record/type/serialized.rb:55
                • ActiveRecord::Type::Serialized#deserialize -> block in delegating_block /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/delegate.rb:339
                  • ActiveRecord::Type::Serialized#block in delegating_block /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/delegate.rb:339
                    • ActiveRecord::Type::Serialized#__getobj__ /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/delegate.rb:384
                    • ActiveRecord::Type::Text#deserialize $GemPath0/gems/activemodel-5.1.2/lib/active_model/type/value.rb:21
                      • ActiveRecord::Type::Text#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
                        • ActiveRecord::Type::Text#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::Coders::YAMLColumn#load $GemPath0/gems/activerecord-5.1.2/lib/active_record/coders/yaml_column.rb:21
                  • Kernel#nil? $GemPath0/gems/activerecord-5.1.2/lib/active_record/coders/yaml_column.rb:22
                  • Kernel#is_a? $GemPath0/gems/activerecord-5.1.2/lib/active_record/coders/yaml_column.rb:23
                  • Regexp#match? $GemPath0/gems/activerecord-5.1.2/lib/active_record/coders/yaml_column.rb:23
                  • Psych.load /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych.rb:251
                    • Psych.parse /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych.rb:324
                      • Psych.parse_stream /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych.rb:374
                        • Kernel#block_given? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych.rb:375
                        • Class#new /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych.rb:376
                          • Psych::Handlers::DocumentStream#initialize /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/handlers/document_stream.rb:7
                            • Psych::Handlers::DocumentStream#initialize /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/tree_builder.rb:22
                        • Class#new /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych.rb:376
                          • Psych::Parser#initialize /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/parser.rb:47
                        • Psych::Parser#parse /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych.rb:377
                          • Psych::Handlers::DocumentStream#start_stream /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/tree_builder.rb:66
                            • Class#new /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/tree_builder.rb:67
                              • Psych::Nodes::Stream#initialize /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/nodes/stream.rb:32
                                • Psych::Nodes::Stream#initialize /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/nodes/node.rb:21
                            • Psych::Handlers::DocumentStream#push /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/tree_builder.rb:86
                              • Array#push /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/tree_builder.rb:87
                          • Psych::Handlers::DocumentStream#start_document /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/handlers/document_stream.rb:12
                            • Class#new /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/handlers/document_stream.rb:13
                              • Psych::Nodes::Document#initialize /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/nodes/document.rb:45
                                • Psych::Nodes::Document#initialize /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/nodes/node.rb:21
                            • Psych::Handlers::DocumentStream#push /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/tree_builder.rb:86
                              • Array#push /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/tree_builder.rb:87
                          • Psych::Handlers::DocumentStream#start_sequence (eval):2
                            • Class#new (eval):3
                              • Psych::Nodes::Sequence#initialize /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/nodes/sequence.rb:73
                                • Psych::Nodes::Sequence#initialize /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/nodes/node.rb:21
                            • Psych::Handlers::DocumentStream#push /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/tree_builder.rb:86
                              • Array#push /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/tree_builder.rb:87
                          • Psych::Handlers::DocumentStream#scalar /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/tree_builder.rb:75
                            • Class#new /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/tree_builder.rb:76
                              • Psych::Nodes::Scalar#initialize /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/nodes/scalar.rb:58
                          • Psych::Handlers::DocumentStream#scalar /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/tree_builder.rb:75
                            • Class#new /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/tree_builder.rb:76
                              • Psych::Nodes::Scalar#initialize /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/nodes/scalar.rb:58
                          • Psych::Handlers::DocumentStream#end_sequence (eval):8
                            • Psych::Handlers::DocumentStream#pop /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/tree_builder.rb:91
                              • Array#pop /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/tree_builder.rb:92
                              • Array#last /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/tree_builder.rb:93
                          • Psych::Handlers::DocumentStream#end_document /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/handlers/document_stream.rb:17
                            • Psych::Handlers::DocumentStream#pop /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/tree_builder.rb:91
                              • Array#pop /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/tree_builder.rb:92
                              • Array#last /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/tree_builder.rb:93
                            • Psych.block in parse /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych.rb:325
                    • Psych::Nodes::Document#to_ruby /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/nodes/node.rb:37
                      • Psych::Visitors::ToRuby.create /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/to_ruby.rb:15
                        • Class#new /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/to_ruby.rb:16
                          • Psych::ClassLoader#initialize /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/class_loader.rb:21
                            • Kernel#dup /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/class_loader.rb:22
                              • Kernel#initialize_dup /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/class_loader.rb:22
                                • Hash#initialize_copy /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/class_loader.rb:22
                        • Class#new /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/to_ruby.rb:17
                          • Psych::ScalarScanner#initialize /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/scalar_scanner.rb:26
                        • Class#new /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/to_ruby.rb:18
                          • Psych::Visitors::ToRuby#initialize /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/to_ruby.rb:23
                            • BasicObject#initialize /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/to_ruby.rb:24
                      • Psych::Visitors::ToRuby#accept /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/to_ruby.rb:31
                        • Psych::Visitors::ToRuby#accept /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/visitor.rb:5
                          • Psych::Visitors::ToRuby#visit /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/visitor.rb:15
                            • Kernel#class /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/visitor.rb:16
                            • Kernel#hash /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/visitor.rb:16
                            • Psych::Visitors::ToRuby#visit_Psych_Nodes_Document /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/to_ruby.rb:310
                              • Psych::Nodes::Document#root /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/nodes/document.rb:56
                                • Array#first /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/nodes/document.rb:57
                              • Psych::Visitors::ToRuby#accept /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/to_ruby.rb:31
                                • Psych::Visitors::ToRuby#accept /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/visitor.rb:5
                                  • Psych::Visitors::ToRuby#visit /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/visitor.rb:15
                                    • Kernel#class /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/visitor.rb:16
                                    • Kernel#hash /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/visitor.rb:16
                                    • Psych::Visitors::ToRuby#visit_Psych_Nodes_Sequence /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/to_ruby.rb:126
                                      • Psych::Visitors::ToRuby#resolve_class /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/to_ruby.rb:395
                                        • Psych::ClassLoader#load /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/class_loader.rb:25
                                      • NilClass#=== /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/to_ruby.rb:140
                                      • Psych::Visitors::ToRuby#register_empty /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/to_ruby.rb:328
                                        • Psych::Visitors::ToRuby#register /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/to_ruby.rb:323
                                        • Array#each /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/to_ruby.rb:330
                                          • Psych::Visitors::ToRuby#block in register_empty /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/to_ruby.rb:330
                                            • Psych::Visitors::ToRuby#accept /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/to_ruby.rb:31
                                              • Psych::Visitors::ToRuby#accept /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/visitor.rb:5
                                                • Psych::Visitors::ToRuby#visit /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/visitor.rb:15
                                                  • Kernel#class /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/visitor.rb:16
                                                  • Kernel#hash /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/visitor.rb:16
                                                  • Psych::Visitors::ToRuby#visit_Psych_Nodes_Scalar /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/to_ruby.rb:122
                                                    • Psych::Visitors::ToRuby#deserialize /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/to_ruby.rb:46
                                                      • Psych::Visitors::ToRuby#resolve_class /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/to_ruby.rb:395
                                                        • Psych::ClassLoader#load /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/class_loader.rb:25
                                                      • Psych::ScalarScanner#tokenize /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/scalar_scanner.rb:33
                                                        • Hash#key? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/scalar_scanner.rb:35
                                                        • Hash#key? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/scalar_scanner.rb:36
                                                        • Regexp#=== /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/scalar_scanner.rb:41
                                                        • Regexp#=== /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/scalar_scanner.rb:48
                                                    • Psych::Visitors::ToRuby#register /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/to_ruby.rb:323
                                            • Array#push /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/to_ruby.rb:330
                                          • Psych::Visitors::ToRuby#block in register_empty /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/to_ruby.rb:330
                                            • Psych::Visitors::ToRuby#accept /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/to_ruby.rb:31
                                              • Psych::Visitors::ToRuby#accept /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/visitor.rb:5
                                                • Psych::Visitors::ToRuby#visit /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/visitor.rb:15
                                                  • Kernel#class /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/visitor.rb:16
                                                  • Kernel#hash /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/visitor.rb:16
                                                  • Psych::Visitors::ToRuby#visit_Psych_Nodes_Scalar /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/to_ruby.rb:122
                                                    • Psych::Visitors::ToRuby#deserialize /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/to_ruby.rb:46
                                                      • Psych::Visitors::ToRuby#resolve_class /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/to_ruby.rb:395
                                                        • Psych::ClassLoader#load /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/class_loader.rb:25
                                                      • Psych::ScalarScanner#tokenize /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/scalar_scanner.rb:33
                                                        • Hash#key? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/scalar_scanner.rb:35
                                                        • Hash#key? /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/scalar_scanner.rb:36
                                                        • Regexp#=== /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/scalar_scanner.rb:41
                                                        • Regexp#=== /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/scalar_scanner.rb:48
                                                    • Psych::Visitors::ToRuby#register /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/to_ruby.rb:323
                                            • Array#push /home/z/.rbenv/versions/2.4.0/lib/ruby/2.4.0/psych/visitors/to_ruby.rb:330
                  • ActiveRecord::Coders::YAMLColumn#assert_valid_value $GemPath0/gems/activerecord-5.1.2/lib/active_record/coders/yaml_column.rb:32
                    • Kernel#nil? $GemPath0/gems/activerecord-5.1.2/lib/active_record/coders/yaml_column.rb:33
                    • Kernel#is_a? $GemPath0/gems/activerecord-5.1.2/lib/active_record/coders/yaml_column.rb:33