Redmine

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REST API provides list of existing relations (#5305).

sample: http://mushroom:3000/issues/24580.xml?include=relations

<issue>
<id>24580</id>
<project name="project number 1296286327740" id="120"/>
<tracker name="Bug" id="1"/>
<status name="New" id="1"/>
<priority name="Normal" id="4"/>
<author name="Redmine Admin" id="1"/>
<subject>task 1</subject>
<description/>
<start_date>2011-07-13</start_date>
<due_date/>
<done_ratio>0</done_ratio>
<estimated_hours/>
<spent_hours>0.0</spent_hours>
<custom_fields type="array">
<custom_field name="my_custom_1" id="1">
<value/>
</custom_field>
<custom_field name="custom_boolean_1" id="2">
<value>0</value>
</custom_field>
</custom_fields>
<created_on>2011-06-30T23:06:27-07:00</created_on>
<updated_on>2011-06-30T23:07:28-07:00</updated_on>
<relations type="array">
<relation delay="" id="2" relation_type="blocks" issue_id="24581"/>
</relations>
</issue>

Excellent! Thank you very much, Jean-Philippe.
Having this API is crucial for proper MSProject-Redmine synchronization support. I hope now can properly save "predecessors" info from a Microsoft Project file into Redmine and then retrieve this info back.

http://mushroom:3030/issues.xml?limit=25&project_id=test&offset=0&include=relations

- does NOT include relations. this only works for a particular issue, not for "get issues" request.
which means if I have 100 issues to load from Redmine, I need to perform 100+1 REST API requests to Redmine to check if those tasks have any relations.
this is not good

at least the issues list should include number of relations for every task, so that if it's not == 0, I'd load them for that particular task (instead of trying to query every single task).
This is an important feature for data import-export between Redmine and MSProject.

Added in r6313. You can now use /issues?include=relations.

I see 1 problem with the implementation: both "forward" and "Reverse" relations are the same:
e.g. I have issues 1 and 2, 1 precedes 2.

I'd expect relations on 1 to say:

"id=.. issue_id=1 issue_to_id=2 type=precedes"

and the relation on 2:

"id=.. issue_id=2 issue_to_id=1 type=follows"

but what Redmine returns now is exactly the same relation text for both issues 1 and 2.