String expressions fail when properties are in an object

[dpdonohue]

Joe I like this tool! I ran this unit test, which is similar to your existing unit test. It always returns false/0

'filtrex: object string test': function(test) {
        test.equal(1, compileExpression('obj.foo == "hello"')({obj:{foo:'hello'}}));
        test.equal(0, compileExpression('obj.foo == "hello"')({obj:{foo:'bye'}}));
        test.equal(0, compileExpression('obj.foo != "hello"')({obj:{foo:'hello'}}));
        test.equal(1, compileExpression('obj.foo != "hello"')({obj:{foo:'bye'}}));
        test.equal(true, compileExpression('obj.foo in ("aa", "bb")')({obj:{foo:'aa'}}));
        test.equal(false, compileExpression('obj.foo in ("aa", "bb")')({obj:{foo:'c'}}));
        test.equal(false, compileExpression('obj.foo not in ("aa", "bb")')({obj:{foo:'aa'}}));
        test.equal(true, compileExpression('obj.foo not in ("aa", "bb")')({obj:{foo:'cc'}}));
    }

[dpdonohue]

So Filtrex fails to match strings when they are nested inside an object. Do you think this is a problem with Filtrex or with the underlying jison engine?

[joewalnes]

Filtrex does not support nested expressions. I haven't added it because there's a lot of edge cases I'd like to think through first.

To handle this, you'll have to write code that flattens your structure into a single nested object.

For example, convert this:

{
  obj: {
    foo:'a',
    bar:'b'
  }
}

into this:

{
  'obj.foo': 'a',
  'obj.bar': 'b'
}

[serhiisol]

For a temp solution you can use https://www.npmjs.com/package/flat package :)

[cshaa]

Also, the new filtrex supports the of operator:

let f = compileExpression('version of software >= 1.4')
f({ software: {name: 'Foo', version: 2} }) // true
f({ software: {name: 'bar', version: 1} }) // false

Using version of software instead of software.version might feel backwards for a developer, but it is closer to plain English, so we went with that.