Issue #451 parsing filters with curlies

lib/graphiti/scoping/filter.rb

@@ -193,14 +193,14 @@ def parse_string_arrays(value, singular_filter)
       # Find the quoted strings
       quotes = value.scan(/{{.*?}}/)
       # remove them from the rest
-      quotes.each { |q| value.gsub!(q, "") }
+      non_quotes = quotes.inject(value) { |v, q| v.gsub(q, "") }
       # remove the quote characters from the quoted strings
       quotes.each { |q| q.gsub!("{{", "").gsub!("}}", "") }
       # merge everything back together into an array
       value = if singular_filter
-        Array(value) + quotes
+        Array(non_quotes) + quotes
       else
-        Array(value.split(",")) + quotes
+        Array(non_quotes.split(",")) + quotes
       end
       # remove any blanks that are left
       value.reject! { |v| v.length.zero? }

spec/filtering_spec.rb

@@ -29,6 +29,20 @@ def self.name
     expect(records.map(&:id)).to eq([employee1.id])
   end
 
+  context "retains filtering value" do
+    it "when value includes curly brackets" do
+      params[:filter] = {first_name: "{{John}}"}
+      records
+      expect(params[:filter]).to eq(first_name: "{{John}}")
+    end
+
+    it "when value does not include curly brackets" do
+      params[:filter] = {first_name: "John"}
+      records
+      expect(params[:filter]).to eq(first_name: "John")
+    end
+  end
+
   context "when filter is type hash" do
     before do
       resource.filter :by_json, :hash do