[SalesForce] Lightning Component > force:inputField is not working for picklist in Sandbox

I have found that not having default attributes can cause problems with binding.

UPDATE - this applies to ALL attributes, including the sobjectType and CloseDate .

Add all attributes (even if empty at this stage) that you want to write to the server, because if they are not at least initialised in the defaults area, they don't get sent.

Also there are perhaps some missing fields that are needed for the Opportunity to deserialize properly (in the internal deserialization routine that is called prior to passing it to your @AuraEnabled method).

So perhaps you could define your oppty attribute like this:

<aura:attribute name="opportunity" 
                type="Opportunity" 
                default="{ 'sobjectType': 'Opportunity',
                           'Name': 'New Opportunity',
                           'StageName': 'Initial Contact',
                           'CloseDate':'2016-08-01'} />

Or at least set the name and stage prior to passing it to your method.

Of course, you may be doing this already - I can't see what your console output is.

This is just a long shot, because you seem to have done everything else right.

I figured the issue. I have deployed the lightning components, tab and apex controller to the QA sandbox without the profiles. I did manually set the permissions for the Apex controller. I was not aware that I need to explicitly set the permissions for the lightning tab under the object settings for the related profiles. Once I set the permissions for the lightning tab, the component started working fine.