breeze.js中的嵌套谓词

Question

Is it possible to use some sort of nested predicates in breeze.js?

I want something like (a) and(b or c or d))

I am only able to chain the predicates without the logical brackets with:

 predicates = predicates.and(a);
 predicates = predicates.or(b);
 predicates = predicates.or(c);
 predicates = predicates.or(d); 
 // predicates not nested: a and b or c or d

Answer 1

You should compose your predicates:

var leftSide = predicates.or(b).or(c).or(d);
var composedPredicate = leftSide.and(a);

It will give you:

(b or c or d) and a

Edit:

Just found a very useful thread:

How do I write a breeze Predicate equivalent to the following SQL