[Parse Server] clientKey is optional if using Parse Server

[hramos]

A client key does not need to be configured in order to deploy a Parse Server. The Parse iOS SDK does not currently support connecting to a clientKey-less Parse Server.

To resolve this, a new initialization method is required:

+ (void)setApplicationId:(NSString *)applicationId;

We will also need to remove the assertion that checks for a client key when the SDK is initialized.

[nlutsenko]

Will do, but only through a new configuration API.

[hramos]

Looks like we can already do this via the Configuration API:

[Parse initializeWithConfiguration:[ParseClientConfiguration configurationWithBlock:^(id<ParseMutableClientConfiguration> configuration) {
   ...

   configuration.applicationId = @"YOUR_APP_ID";
   configuration.server = @"http://localhost:1337/parse";

   ...

}]];

I think we only need to remove the assert?

[nlutsenko]

Yup, you are correct. Remove the validation on client-key and make all the code paths that require the client key to be safe - be able to accept nil.