ActiveRecordを使うときにはテーブルのカラム名に気を付けよう
カラム名に「type」を使用して怒られました．使ってはいけないもの一覧を貼っておきましょう．
参考 : 保護者の方へ
silence_stream schema_format before_validation_on_update readonly! save_with_validation! __send__ save! before_update update methods colorize_logging decode_b attributes_before_type_cast valid? instance_values save_with_transactions! taint primary_key_prefix_type before_save toggle! after_validation_on_update readonly? subclasses_of clear_aggregation_cache save_without_validation! singleton_methods hash after_update update_attribute_with_validation_skipping update_attribute encode64 initialize send connection instance_exec save_without_transactions! display instance_of? after_save nil? unloadable id_before_type_cast suppress validate clear_association_cache protected_methods default_timezone update_with_callbacks tainted? instance_eval to_param returning untaint kind_of? table_name_prefix create_or_update_with_callbacks valid_with_callbacks? locking_enabled? dclone equal? quote_with_deprecation attributes_from_column_definition_with_lock update_attributes! save private_methods update_without_callbacks increment ` attribute_present? b64encode quote with_options create_without_timestamps is_a? configurations valid_without_callbacks? freeze attribute_names eql? quoted_id require_library_or_gem load before_destroy extended_by id update_attributes attributes_from_column_definition destroy_with_transactions allow_concurrency before_validation public_methods daemonize has_attribute? id= update_with_timestamps extend table_name_suffix before_create save_with_validation require_gem require after_destroy reload update_with_lock copy_instance_variables_from type to_yaml to_yaml_style method destroy_without_transactions increment! instance_variables lock! after_validation frozen? decrement to_json errors update_without_timestamps to_a after_create blank? record_timestamps destroy_with_callbacks class silence_warnings update_attribute_without_validation_skipping to_yaml_properties gem save_with_transactions transaction object_id instance_variable_get enable_warnings validate_on_create generate_read_methods before_validation_on_create == attributes respond_to_without_attributes? === new_record? to_s pluralize_table_names create_with_callbacks create_or_update verification_timeout attributes= save_without_validation create_with_timestamps destroy_without_callbacks initialize_with_callbacks taguri clone destroy column_for_attribute save_without_transactions to_query decrement! =~ instance_variable_set silence_stderr after_validation_on_create lock_optimistically validate_on_update remove_subclasses_of toggle taguri= __id__ to_xml logger inspect [] decode64 create respond_to? extend_with_included_modules_from []= dup
追記
コメント欄にてid:ujihisaさんよりご指摘をいただきまして，ソートしたものを載せることにしました！ ujihisa++
== === =~ [] []= __id__ __send__ ` after_create after_destroy after_save after_update after_validation after_validation_on_create after_validation_on_update allow_concurrency attribute_names attribute_present? attributes attributes= attributes_before_type_cast attributes_from_column_definition attributes_from_column_definition_with_lock b64encode before_create before_destroy before_save before_update before_validation before_validation_on_create before_validation_on_update blank? class clear_aggregation_cache clear_association_cache clone colorize_logging column_for_attribute configurations connection copy_instance_variables_from create create_or_update create_or_update_with_callbacks create_with_callbacks create_with_timestamps create_without_timestamps daemonize dclone decode64 decode_b decrement decrement! default_timezone destroy destroy_with_callbacks destroy_with_transactions destroy_without_callbacks destroy_without_transactions display dup enable_warnings encode64 eql? equal? errors extend extend_with_included_modules_from extended_by freeze frozen? gem generate_read_methods has_attribute? hash id id= id_before_type_cast increment increment! initialize initialize_with_callbacks inspect instance_eval instance_exec instance_of? instance_values instance_variable_defined? instance_variable_get instance_variable_set instance_variables is_a? kind_of? load lock! lock_optimistically locking_enabled? logger method methods new_record? nil? object_id pluralize_table_names primary_key_prefix_type private_methods protected_methods public_methods quote quote_with_deprecation quoted_id readonly! readonly? record_timestamps reload remove_subclasses_of require require_gem require_library_or_gem respond_to? respond_to_without_attributes? returning save save! save_with_transactions save_with_transactions! save_with_validation save_with_validation! save_without_transactions save_without_transactions! save_without_validation save_without_validation! schema_format send silence_stderr silence_stream silence_warnings singleton_methods subclasses_of suppress table_name_prefix table_name_suffix taguri taguri= taint tainted? to_a to_json to_param to_query to_s to_xml to_yaml to_yaml_properties to_yaml_style toggle toggle! transaction type unloadable untaint update update_attribute update_attribute_with_validation_skipping update_attribute_without_validation_skipping update_attributes update_attributes! update_with_callbacks update_with_lock update_with_timestamps update_without_callbacks update_without_timestamps valid? valid_with_callbacks? valid_without_callbacks? validate validate_on_create validate_on_update verification_timeout with_options
これでいいかな！
