Define the filter logic based on the camel cased input key passed to the filter() method.

• Empty strings and null values are ignored by default.
  • Empty strings and values can be configured not to be ignored by setting protected $allowedEmptyFilters = false; on a filter.
• If a setup() method is defined it will be called once before any filter methods regardless of input
• _id is dropped from the end of the input key to define the method so filtering user_id would use the user() method
  • Can be changed with by definining protected $drop_id = false; on a filter
• Input without a corresponding filter method are ignored
• The value of the key is injected into the method
• All values are accessible through the $this->input() method or a single value by key $this->input($key)
• All Eloquent Builder methods are accessible in $this context in the model filter class.

Github: https://github.com/Tucker-Eric/EloquentFilter