Implement custom JSON serializer for book category

Signed-off-by: Pekka Helenius <fincer89@hotmail.com>

bookstore/src/main/java/com/fjordtek/bookstore/model/CategoryJsonSerializer.java

@@ -0,0 +1,30 @@
+package com.fjordtek.bookstore.model;
+
+import java.io.IOException;
+
+import com.fasterxml.jackson.core.JsonGenerator;
+import com.fasterxml.jackson.databind.SerializerProvider;
+import com.fasterxml.jackson.databind.ser.std.StdSerializer;
+
+public class CategoryJsonSerializer extends StdSerializer<Category> {
+	private static final long serialVersionUID = 6376700470881235634L;
+
+	public CategoryJsonSerializer() {
+		this(null);
+	}
+
+	public CategoryJsonSerializer(Class<Category> jd) {
+		super(jd);
+	}
+
+	@Override
+	public void serialize(Category category, JsonGenerator gen, SerializerProvider provider)
+			throws IOException {
+				gen.writeStartObject();
+				// Category class Id has JsonIgnore annotation
+				//gen.writeFieldId(category.getId());
+				gen.writeStringField("name", category.getName());
+				gen.writeEndObject();
+	}
+
+}