Ruby's case expressions have two forms: The first form is close to a set of consecutive if statements: it lets you list a set of conditions and executes the statement that corresponds to the first true conditional expression. The second form is
Recently, there is a need to use a string as a class, for example: There is a string "Chinamag" that invokes the method under the class Chinamag according to this string. Solution: 1.rails You can use the Constantize method. Copy Code code
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