Rails how to get DB column dynamically?

2018-06-27 13:40:22

Fellas,

I have a database with columns named line1, line2, line3, line4, line5, line6.

I have a

x = rand(6)+1

to get the random value. Now I want the "line"+x somehow like this:

y = @variable."line"+x.to_s

And get back the data in lineX. Whats the correct formula? TX!

只需使用Object send方法：

y = @variable.send("line#{x}")

Assuming you have an ActiveRecord model for your database table. The following should work:

x = rand(6)+1 
@record = MyModel.find(1)
y = @record["line#{x}"]

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