Adding condition when spliting filter_params to prevent issue

Author: guillaumebriday

CHANGELOG.md

@@ -4,6 +4,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## v0.2.0 - 2019-08-01
+### Fixed
+- Adding condition when spliting filter_params to prevent issue.
+
 ## v0.1.5 - 2019-07-20
 ### Changed
 - Using `Array.wrap` in apply_sort instead of `[].flatten`.

lib/jsonapi/scopes/filters.rb

@@ -19,7 +19,7 @@ def apply_filter(params)
         filtering_params = params.dig(:filter) || {}
 
         filtering_params.each do |key, value|
-          value = value.to_s.split(',').reject(&:blank?)
+          value = value.to_s.split(',').reject(&:blank?) if value.include?(',')
 
           records = records.public_send(key, value) if @filters.include?(key.to_sym)
         end