Hi,

I'm trying to remove a record from a store of a hasMany association.

Code:
activeCheckIn.orders().remove(order);
Code:
associations: [{
                type: 'hasMany',
                model: 'MyApp.model.Order',
                name: 'orders',
                store: {
                    syncRemovedRecords: false
                }
        }]
This operation fails with a Cannot call method 'hasOwnProperty' of null in model.js Line 798.
Debugging revealed that during removing of the record in model.js destroy function modified is set to null.

Code:
   destroy: function() {
        var me = this;
        me.notifyStores('afterErase', me);
        if (me.getUseCache()) {
            delete Ext.data.Model.cache[Ext.data.Model.generateCacheId(me)];
        }
        me.raw = me.stores = me.modified = null;
        me.callParent(arguments);
    },
Later in hasMany.js onRemoveRecords the foreign key is set to null

Code:
    onRemoveRecords: function(store, records) {
        var ln = records.length,
            i, record;
        for (i = 0; i < ln; i++) {
            record = records[i];
            record.set(this.getForeignKey(), null);
        }
    },
This fails in the Model.js set method in Line 798 because obviously modified is null.
Code:
if (modified.hasOwnProperty(fieldName)) {

A Workaround for this problem is to set destroyRemovedRecords: false