iris-go | official Go language binding for the Iris cloud messaging | Machine Learning library

Important: There is controversy about whether to use Iris at all as the author apparently deleted the history multiple times, which makes it hard to use as a stable API. Please read Why you should not use Iris for your Go and form your own opinion

Just use ctx.FormValue(...) instead of ctx.ParamDecoded():

I'm also a newbie at Go, but the error seems to be indicating that it's trying to read an unexported field - and I see that your Student struct has all UNexported fields (Go treats Capitalized fields as exported and uncapitalized fields as the opposite)

In Go's template, once you declare a variable and assign value to it, you can't change its value. What happen in your code are:

1. The value of outer total price which is declared as $TotalPrice := 0.0 is always 0.0, and the variable scope is extended to the end of the template.
2. When you defined a variable named $TotalPrice inside range, although the variable name is the same, a completely new variable will be allocated. The value assigned to this variable is given by FloatInc($TotalPrice, .TotalPrice). Note that argument $TotalPrice refers to outer total price which is 0.0, so the statement will be equal to $TotalPrice := 0.0 + .TotalPrice. Thus, when you print the $TotalPrice in each iteration, you got current .TotalPrice instead of accumulated total price.
3. The scope of variable declared in (2) is between range and end. Thus when you print $TotalPrice at the last row, you got the value of outer total price declared in (1), i.e. 0.0.

In your case, you need to declare a function which takes Transactions as its argument then calculate the total inside the function, e.g.