feat(filter-query): add like operator

Author: jaredcnance

src/JsonApiDotNetCore/Internal/Query/FilterOperations.cs

@@ -6,6 +6,7 @@ public enum FilterOperations
         lt = 1,
         gt = 2,
         le = 3,
-        ge = 4
+        ge = 4,
+        like = 5
     }
 }

src/JsonApiDotNetCore/Internal/Query/QuerySet.cs

@@ -83,26 +83,29 @@ private FilterQuery ParseFilterOperation(AttrAttribute attribute, string value)
             if(value.Length < 3)
                 return new FilterQuery(attribute, value, FilterOperations.eq);
 
-            var prefix = value.Substring(0, 3);
+            var operation = value.Split(':');
 
-            if(prefix[2] != ':')
+            if(operation.Length == 1)
                 return new FilterQuery(attribute, value, FilterOperations.eq);
 
             // remove prefix from value
-            value = value.Substring(3, value.Length - 3);
+            var prefix = operation[0];
+            value = operation[1];
 
             switch(prefix)
             {
-                case "eq:":
+                case "eq":
                     return new FilterQuery(attribute, value, FilterOperations.eq);
-                case "lt:":
+                case "lt":
                     return new FilterQuery(attribute, value, FilterOperations.lt);
-                case "gt:":
+                case "gt":
                     return new FilterQuery(attribute, value, FilterOperations.gt);
-                case "le:":
+                case "le":
                     return new FilterQuery(attribute, value, FilterOperations.le);
-                case "ge:":
+                case "ge":
                     return new FilterQuery(attribute, value, FilterOperations.ge);
+                case "like":
+                    return new FilterQuery(attribute, value, FilterOperations.like);
             }
 
             throw new JsonApiException("400", $"Invalid filter prefix '{prefix}'");