Parameter $columns can be a string, and must be converted to expected array

[jayprakashji]

With Eloquent you can do both of these:
Model::where('id', $id)->get(['column'])
Model::where('id', $id)->get('column')

Builder is converting it.
https://github.com/laravel/framework/blob/5.8/src/Illuminate/Database/Query/Builder.php#L2117

But makeCacheKey() is expecting array.

I took the same approach that laravel has, into makeCacheKey().

[coveralls]

Coverage decreased (-2.6%) to 93.091% when pulling 14dcb6b on jayprakashji:master into 536316a on GeneaLabs:master.

[mikebronner]

Thanks for submitting this. I will take a look, probably later today. :)

[mikebronner]

@jayprakashji I went ahead and fixed this as the root of the cause, instead of updating the makeCacheKey() method and added a test case for it. Thanks again!