I want to replace a collection inside a view. I use the reset command like this:
var maColl=mContent.get(ici).get("svgParameterList");
msvgParameterListView.collection.reset(maColl);
A JSON.stringify gives this :
maColl
[{"id":"x","name":"x"},....{"id":"style","name":"style"}]
msvgParameterListView.collection
[[{"id":"x","name":"x"},....{"id":"style","name":"style"}]]
Now, i have my collection in an array, so when i render it return null value.
How to change array of collection into collection ?
In short, how to make msvgParameterListView.collection equal to maColl ?
Note the [[ ]] for the new collection.
Note maColl is a collection inside another collection.
If I understand correctly, you are trying to reset a collection with the models of another collection? collection.toJSON is your friend:
toJSON collection.toJSON()
Return an array containing the attributes hash of each model in the collection. This can be used to
serialize and persist the collection as a whole. The name of this
method is a bit confusing, because it conforms to JavaScript's JSON
API.
which could be applied like this
msvgParameterListView.collection.reset(maColl.toJSON());
Or if you want to keep a reference to the original models, pass maColl.models
msvgParameterListView.collection.reset(maColl.models);
Passing directly a collection to reset will only confuse Backbone.
Related
After making some queryes i have a collection of array objects. But after orderByDesc the data transform in hole objects, instead of how it was (array of objects), what it happened? Is like the method orderByDesc tranform the collection in another type.
Ex:
some logic code, queries...etc
in the end
return $total->sortByDesc('date');
After using sortByDesc:
Before to sortByDesc:
Now that is in type of objects is giving some issues working with it in my javascript application (angularjs), it not a array of objects how should it be.
Try to copy the collection when sorting and use values()
$sorted = $total->sortByDesc('date');
dd($sorted->values());
Same result?
Is there any way to compare the 2 difference instances of a same backbone model?
You commented:
I don't want to compare the attribute's value manually by passing the attribute's name. Instead when i give the models it should know by itself that this is the attribute and this is the value and then compare the values to know it equal or not
There's no built in method that compares the model to another model. But you can implement a method on the Backbone.Model prototype to do this:
Backbone.Model.prototype.equalTo = function(other) {
return _.isEqual(this.attributes, other.attributes);
};
It utilizes Underscore's isEqual() which compares whether two objects are equal. isEqual() get's passed both internal Backbone data objects attributes.
You can then do:
if (m1.equalTo(m2)) {
console.log("equal");
}
If you don't want to modify Backbone.Model, you can extend from it and implement equalTo() there.
i have a simple extension of a BaseModelData in a form of MyModel, and i can call new MyModel().getObj1().getObj2() to get to obj2's string value. i have a number of MyModel instances, so i would like to populate a ComboBox instance with an obj2 value from each MyModel instance. first, i called ComboBox.setDisplayField("obj1.obj2"), because using such hierarchical property approach works for TextField.setName() cases. then, i took a store which contains all MyModel instances, and set it to a ComboBox via setStore(). however, the combobox is empty. it looks as though setting the aforementioned property via ComboBox.setDisplayField() does not work the same way as it does for TextField.setName(). i tried using my own instance of ListModelPropertyEditor, but without success. so what are my alternatives?
thank you for your time!!!
I am not sure about accessing hierarchical data from ComboBox.setDisplayField() method, but can you can achieve it by adding a new method say getObj2() in MyModel class, which will essentially represent obj1.obj2.
public Obj2 getObj2() {
return getObj1().getObj2(); //with possible null checks
}
Now you can call ComboBox.setDisplayField("obj2") and get the work done.
I've got a Backbone Collection. How can I slice the collection, or at least truncate the list to a certain length?
Assuming that you have your collection defined and initialized and that you want to mutate the collection (change it in place) you have to do:
collection.reset(collection.first(n));
of you can use .last(n) to get last N elements.
If you just wanted to get the first n elements without modyfying the collection just do:
var models = collection.first(n);
Here is a list of all the underscore methods you can use directly on your collection.
I have a collection of models:
city = new M.City
App.citiesList = new C.CitiesList model: city
App.citiesList.fetch()
How can I access to the model with id=15 for example?
I need something like App.citiesList.find(15).name(), where name() is model function
When I try to add function find to the collection it is incorrect.
When I try to iterate over App.citiesList.models - I see only one model or what it is.. I actually don't know.
Thanks a lot!
If App.citiesList is a Backbone collection then you'd want to use get:
get collection.get(id)
Get a model from a collection, specified by id.
So this would get you your model from the collection:
fifteen = App.citiesList.get 15
And if you wanted to call a method on it:
App.citiesList.get(15).name()
You'd probably want to make sure you got something back from App.citiesList.get 15 first though (unless you knew it was there of course). Since you're working in CoffeeScript you could use the existence operator like this:
name = App.citiesList.get(15)?.name()
#----------------------------^
to get 15's name or undefined in the name variable.
The find method on App.citiesList would be Underscore's find and that doesn't find an object with a particular ID.