What is the best way to remove an item from an array in Ember (not using Ember Data)

I use an ajax call to get my model. Once I have my model I need to make changes to it and save those changes.

In the version of ember I had been using it was easy, I just used an ajax call to get my model, make changes and then post my model to save it.

Now when I need to make a change to my model, I have to do an Ember.set(model, "title", "New Title Text");

How could I remove an item from an array?

"gallery" : [ 
    {
        "_id" : ObjectId("5499f6cea66483d54bad151d"),
        "description" : "X",
        "title" : "Test1234",
        "meta" : {
            "position" : 0
        },
        "src" : {
            "large" : "http://ift.tt/1B1NSzm",
            "medium" : "http://ift.tt/1B1NSzm",
            "small" : "http://ift.tt/1B1NSiU"
        }
    }, 
    {
        "description" : "",
        "title" : "",
        "_id" : ObjectId("549ae002b078644011254066"),
        "meta" : {
            "position" : 1
        },
        "src" : {
            "large" : "http://ift.tt/16QCpti",
            "medium" : "http://ift.tt/16QCpti",
            "small" : "http://ift.tt/16QCptq"
        }
    }, 
    {
        "description" : "",
        "title" : "",
        "_id" : ObjectId("549ae002b078644011254065"),
        "meta" : {
            "position" : 3
        },
        "src" : {
            "large" : "http://ift.tt/1B1NSj2",
            "medium" : "http://ift.tt/1B1NSj2",
            "small" : "http://ift.tt/16QCn4N"
        }
    }, 
    {
        "description" : "",
        "title" : "",
        "_id" : ObjectId("549ae05eb078644011254067"),
        "meta" : {
            "position" : 2
        },
        "src" : {
            "large" : "http://ift.tt/1B1NSzw",
            "medium" : "http://ift.tt/1B1NSzw",
            "small" : "http://ift.tt/1B1NVeu"
        }
    }
]