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关于 ruby?? on rails:NoMethodError – nil:NilClass 的未定义方法”safe_constantize”

NoMethodError-undefinedmethod`safe_constantize'fornil:NilClass我正在尝试按照GoRails.com上的actioncable指南创建一个ActionCable聊天室。当我尝试连接到ActionCable时，我收到以下错误：NoMethodError-nil:NilClass的未定义方法"safe_constantize"1234567891011121314151617[ActionCable][User1]Couldnotexecutecommandfrom{"command"=>"subscribe","identifier"=
amp未定spanclasssectionactioncablerubyruby-on-railsruby-on-rails-4ruby-on-rails-5

java - com.google.android.gms.common.internal.safe parcel.safe parcelable 未找到

safeparcelable39compileandroidjavafirebasefirebase-cloud-messaging

ruby-on-rails - 制作一个字符串 "regexp-safe"

ruby-on-railsregexp-safesectioncommentwordruby

html - 在 HTML 和 CSS 中实现完全对齐 : works in limited-quirks mode but no-quirks mode messes up the height

quirksmodecodeHTMLsectioncssdtdquirks-mode

mysql - "FOR UPDATE"v/s "LOCK IN SHARE MODE": Allow concurrent threads to read updated "state" value of locked row

amp34PreparedStatementfalsemysqljdbcconcurrencyinnodbdeadlock

mysql - 与 mysql 中的 sql_mode=only_full_group_by 不兼容

mysqlonly_full_group_bycodeidsectionruby-on-rails

ios - XCode - “' autorelease' 不可用 : not available in ARC mode”

autoreleaseampnoreferrersectionnoopeneriosautomatic-ref-countingasihttprequest

mysql - #1055 - SELECT 列表的表达式不在 GROUP BY 子句中，并且包含非聚合列，这与 sql_mode=only_full_group_by 不兼容

only_full_group_bysql_modesectionmysqlcodemysql-error-1055

javascript - 语法错误 : Strict mode does not allow function declarations in a lexically nested statement

declarationsjavascript34reactfacebookandroidreact-native

Apache Hadoop 2.6 : Pseudo Distribution Mode Setup

DistributionApachecodehadoopsection
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