Rails-在控制器中调用模型方法

Question

Basically, I have a datetime field in my model and I want to return it as an age. My question is, how do I make @student_age an array of ages?

The top image is my controller. The bottom image is my model method, which inputs the SQL query.

Answer 1

Student.select('date_part("year", age(dob))')

Answer 2

I dont quite get what you want but if you want your query automatically returns an array you can do this.

In rails 4 you can add pluck to return an array.

Student.select('date_part("year",age(dob)').pluck(:date_part)

In rails 3 you can do this.

Student.select('date_part("year",age(dob)').collect{|x| x.date_part}

Output will be like this [24, 13, 56, 34]