[FREEMARKER-67] Doesn't support org.bson.Document's correct order of keys.

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Resolved
• Affects Version/s: 2.3.23, 2.3.24-incubating, 2.3.25-incubating, 2.3.26-incubating
• Fix Version/s: 2.3.23, 2.3.24-incubating, 2.3.25-incubating, 2.3.26-incubating
• Component/s: engine
• Labels: features
• Environment: Windows7, jdk1.8.0_131 64bit, Tomcat 8.0.45, SpringMVC 4.3.10.RELEASE, mongo-java-driver 3.4.2
• Assignee: Unassigned
• Reporter: Pu Zhongqiang
• Created: 10/Aug/17 05:30
• Updated: 11/Aug/17 09:36
• Resolved: 11/Aug/17 02:13

Description

In mongodb's Java Driver 3.x, org.bson.Document is a representation of a bson document as a Map. Although org.bson.Document is not a subclass of LinkedHashMap, it really DOES maintain a meaningful order for its keys.

It works good if I use LinkedHashMap to load data.

LinkedHashMap<String,Object> accepted_sorts = new LinkedHashMap<>();
accepted_sorts.put("-favorite_time", "Hello");
accepted_sorts.put("-publish_time", "Welcome");
model.put("accepted_sorts", accepted_sorts);

<#list accepted_sorts?keys as value>
	${value?string}
</#list>
<br>
<#list accepted_sorts as key,value>
	${key?string},${value?string}
</#list>

it rendered as:

-favorite_time -publish_time 
-favorite_time,Hello -publish_time,Welcome 

But Freemarker doesn't support org.bson.Document's correct key order. You can see my test below:

Document accepted_sorts = new Document();
accepted_sorts.put("-favorite_time", "Hello");
accepted_sorts.put("-publish_time", "Welcome");
model.put("accepted_sorts", accepted_sorts);

<#list accepted_sorts?keys as value>
	${value?string}
</#list>
<br>
<#list accepted_sorts as key,value>
	${key?string},${value?string}
</#list>

it rendered as wrong order:

-publish_time -favorite_time 
-publish_time,Welcome -favorite_time,Hello 

So, in the end, I wish freemarker can add support for org.bson.Document's correct order of keys.