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Underscore functions transparently unwrap knockout observables
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//make a limited set of underscore functions transparently unwrap knockout observables | |
(function knockoutifyUnderscore(_) { | |
var unwrap = ko.utils.unwrapObservable; | |
//These can be shimed in a standard way | |
var koFriendly = ['map', 'filter', 'find', 'each', 'findBy', 'first', 'last', 'head', 'tail', 'union', 'compact', 'flatten', 'difference', 'without']; | |
var oldMap = _.map; | |
for (var _i = 0; _i < koFriendly.length; _i++) { | |
(function(fnName) { | |
var originalFn = _[fnName]; | |
_[fnName] = function() { | |
var args; | |
args = oldMap(arguments, unwrap); | |
return originalFn.apply(_, args); | |
}; | |
})(koFriendly[_i]); | |
} | |
//These underscore commands need special attention | |
_.mixin({ | |
where: function(collection, query) { | |
query = _.mapObject(query, function(val, key){ | |
return [key, unwrap(val)] | |
}); | |
return _.filter(collection, function(item){ | |
return _.all(query, function(queryVal, key) { | |
return queryVal === unwrap(item[key]); | |
}) | |
}); | |
} | |
}); | |
})(_) |
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