Binary operator '==' cannot be applied to operands of type 'Expression<Int64>' and 'Int'

[lita-jerry]

Hello:
I have a question, It really puzzles me:
let a = 1
let deleteRow1 = templates.filter(id == a) //Binary operator '==' cannot be applied to operands of type 'Expression<Int64>' and 'Int'
let deleteRow2 = templates.filter(id == 1) //No error

I want to pass the argument “id” into the function
Why, Am I doing anything wrong?

[wukongzhikong]

just add type annotation to constant a:"let a: Int64 = 1".
Expression can only be compared with type Int64's.

[lita-jerry]

Int(a)
it's working