enforce filter by scopes to have exact matches with the allowed_scopes

if we encounter an exact match on requested_field with allowed_scopes do not continue to check for additional filter with attribute and predicate.

Author: fluxsaas

lib/jsonapi/filtering.rb

@@ -64,15 +64,21 @@ def jsonapi_filter_params(allowed_fields, allowed_scopes)
           to_filter = to_filter.split(',')
         end
 
-        # filter by attributes
-        # {"first_name_eq"=>"Beau"}
-        if predicates.any? && (field_names - allowed_fields).empty?
+        # filter by scopes expects an exact match
+        # with the `allowed_scopes`. Predicates can be a part of named scopes
+        # and should be handled first
+        # Make sure to move to the next after a match
+        # {"created_before"=>"2013-02-01"}
+        # {"created_before_gt"=>"2013-02-01"}
+        if allowed_scopes.include?(requested_field)
           filtered[requested_field] = to_filter
+          next
         end
 
-        # filter by scopes
-        # {"created_before"=>"2013-02-01"}
-        if (field_names - allowed_scopes).empty?
+
+        # filter by attributes
+        # {"first_name_eq"=>"Beau"}
+        if predicates.any? && (field_names - allowed_fields).empty?
           filtered[requested_field] = to_filter
         end
       end