然而，我们完全不清楚你是如何得到一个String而不是一个Array of Symbols的，Rails指南中关于复合键的内容也没有解释你是如何得到这种状态的。我不得不假设您从表单输入或URI参数（两者都表示为字符串）获取数据，而不是将元素解析为 * 单独的 * 列名，以便您可以从两个String值正确地形成复合键。关于表单中
cmd: commandline command line string which is passed to a shell [env, commandline, opts] command line string which is passed to a shell [env, cmdname, arg1, ..., opts] command name and one or more arguments (no shell) [env, [cmdname, argv0], arg1, ..., opts] command name an...
VERSION Version bump to 0.50 May 20, 2011 datify.gemspec Regenerate gemspec for version 0.50.0 May 20, 2011 Repository files navigation README MIT license datify¶ ↑Datify is a rubygem to convert a string storing a date or a time in a proper Time ruby object. Imagine you have a ...
The allocated region can be accessed by ‘RSTRING_PTR(str)’.Notice: Do not change the value of the structure directly, unless you are responsible for the result. This ends up being the cause of interesting bugs.Convert C Data into VALUE¶ ↑To convert C data to Ruby values:...
delegated to was `nil`. Now the `allow_nil` option has been added to enable the user to specify they want `nil` returned in this case. *Matthew Tanous* * `truncate` would return the original string if it was too short to be truncated ...
to convert with to_str method. *\post the object referred by \p namep is a Symbol or a * Stringif non-nil value is returned, or is a String * ifnil is returned. */ VALUE rb_check_symbol(volatile VALUE*namep) { VALUE sym; VALUE tmp; VALUE name ...
Ruby 中还定义了 to_str、to_int、to_ary 和 to_hash,用于方法进行隐式的转换。不过在内建类里,这些转换方法并没有被普遍的实现。 在Ruby1.9 里,内建的 String、Array、Hash、Regexp 及 IO 类都定义了一个名为 try_convert 的类方法。如果这个方法的实参定义了以上一个合适的隐式转换方法,那么就会对其方...
It will create a named scope :search_for that can be called with a query string. It will build an SQL query using the provided query string and a definition that specifies on what fields to search. Because the functionality is built on named_scope, the result of the search_for call can...
How convert a string into a ActiveSupport::TimeWithZone? 我需要更新一个字段(称为updated_at)。 MySQL中的字段类型为datetime,类为ActiveSupport::TimeWithZone。 但是日期是像"10/17/2008"这样的字符串。 我使用了"10/17/2008".to_date(我打算使用.to_time和.to_datetime),即使在控制台中成功保存了Active...
Strings can be converted to other Ruby object types such asFixnums,FloatsandSymbols. To convert a String to an integer use theto_imethod: "1000".to_i => 1000 To convert a String to Float use theto_fmethod: "1000".to_f => 1000.0 ...