fix string handling for native ID (#68)

Author: Andy2003

src/main/kotlin/org/neo4j/graphql/Predicates.kt

@@ -72,8 +72,12 @@ data class ExpressionPredicate(val name: String, val op: Operators, val value: A
     val not = if (op.not) "NOT " else ""
     override fun toExpression(variable: String): Cypher {
         val paramName: String = ProjectionBase.FILTER + paramName(variable, name, value).capitalize()
-        val field = if (fieldDefinition.isNativeId()) "ID($variable)" else "$variable.${name.quote()}"
-        return Cypher("$not$field ${op.op} \$$paramName", mapOf(paramName to value))
+        val query = if (fieldDefinition.isNativeId()) {
+            "${not}ID($variable) ${op.op} toInteger(\$$paramName)"
+        } else {
+            "$not$variable.${name.quote()} ${op.op} \$$paramName"
+        }
+        return Cypher(query, mapOf(paramName to value))
     }
 }
 

src/main/kotlin/org/neo4j/graphql/handler/BaseDataFetcher.kt

@@ -127,9 +127,9 @@ abstract class BaseDataFetcher(
                     val queryParams = mapOf(paramName to idProperty.value.toJavaValue())
                     if (idField.isNativeId()) {
                         if (isRelation) {
-                            Cypher("()-[$variable:$label]->() WHERE ID($variable) = $$paramName", queryParams)
+                            Cypher("()-[$variable:$label]->() WHERE ID($variable) = toInteger($$paramName)", queryParams)
                         } else {
-                            Cypher("($variable:$label) WHERE ID($variable) = $$paramName", queryParams)
+                            Cypher("($variable:$label) WHERE ID($variable) = toInteger($$paramName)", queryParams)
                         }
                     } else {
                         // TODO handle @property aliasing

src/main/kotlin/org/neo4j/graphql/handler/projection/ProjectionBase.kt

@@ -48,7 +48,7 @@ open class ProjectionBase {
         // todo turn it into a Predicate too
         val eqExpression = noFilter.map {
             if (type.getFieldDefinition(it.name)?.isNativeId() == true)
-                "ID($variable) = \$${paramName(variable, it.propertyName, it.value)}"
+                "ID($variable) = toInteger(\$${paramName(variable, it.propertyName, it.value)})"
             else
                 "$variable.${it.toCypherString(variable, false)}"
         }