[SalesForce] How to fill a salesForce lightning aura:attribute element with custom object

I'm trying to fill <aura:attribute name="selectedQuotation" type="salesTool.Quotation__c" /> in any way that could works

Filling it with default value compile (means i can save the file)

default="{ 'sobjectType': 'salesTool__Quotation__c',
'Name': 'Test',
'Id':'',
'salesTool__Contact__c':'',
'salesTool__Package__c':'',
'salesTool__Signed__c':false,
'salesTool__Site__c':''
}"

But a "Uncaught Error: ComponentDef Config required for registration" Error is raised in browser logs at runtime.
The folloing demonstration example works well for me :

<aura:attribute name="newExpense" type="salesTool.Expense__c"
default="{ 'sobjectType': 'salesTool__Expense__c',
'Name': '',
'salesTool__Amount__c': 0,
'salesTool__Client__c': '',
'salesTool__Date__c': '',
'salesTool__Reimbursed__c': false
}"/>

But my case is different in a way i use lookupFields and not only literals.

Filling it with an instance of myCustomObject through application event result in an other error.
As it seems my aura:attribute is empty at the initialisation of the component, the variable last in a aura source code is null and cause error.

 if (value.auraType === "Component" || !value.isLiteral()) {
            var last = component.lastRenderedValue;
            if (last !== value) {
                var referenceNode = **last**.getReferenceNode();

If somebody have some better experience of lightning, I would appreciate some help 😉

Best Answer

You can set a the value of a Lookup field with the Id of the record it references.

For example, if you have a Contact object you can specify a default for the Account lookup, by specifying an Id string for the AccountId field. 

<aura:attribute name="newContact" type="Contact"
    default="{ 'sobjectType': 'Contact',
               'LastName': 'Smith',
               'AccountId': '001i000002zxpz1' 
             }"/>

You could also leave it blank and then set it in your JavaScript before calling to your Apex controller.

<aura:attribute name="newContact" type="Contact"
    default="{ 'sobjectType': 'Contact',
               'LastName': 'Smith',
               'AccountId': '' 
             }"/>

And, prior to enqueueing the action set the value explicitly.

var con = component.get("v.newContact");
con.AccountId = '001i000002zxpz1';
action.setParams({
    con: con
});

Or, you could leave it blank altogether and set it in your Apex controller:

@AuraEnabled
public static Contact createContact(Contact con) {
    con.AccountId = '001i000002zxpz1';
    insert con;

    return con;
}
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