How to get all Leads from a Tag Record using the API?

We don't use Tags, but Tags have a flex-relate field to the Leads/Contacts etc

Based on the Tags vardef it looks like there is a link <module>_link generated for each module that has a Tag (all but the Tags module itself). See: 

modules/Tags/vardefs.php

modules/Tags/TagsRelatedModulesUtilities.php

Which would imply that you could use /Tags/:record/link/:link_name

but the link name is <module>_link so perhaps something like:

Tags/#{sugar_tag_id}/link/leads_link

http://support.sugarcrm.com/Documentation/Sugar_Developer/Sugar_Developer_Guide_7.9/Integration/Web_Services/v10/Endpoints/modulerecordlinklink_name_GET/

Again, I've not verified that you get results because we don't have any tags, but when I tested it I did get an empty set which seems to suggest it will work:

object(stdClass)#2 (2) { ["next_offset"]=> int(-1) ["records"]=> array(0) { } }

HTH

FrancescaS

I tested it and can confirm it works exactly like this:

GET - Contacts with specific tag
/rest/v10/Tags/#{tag_id}/link/contacts_link

GET - Leads with specific tag
/rest/v10/Tags/#{tag_id}/link/leads_link

Another way to accomplish this is through the search in the Contacts or Leads, there you don't even need the Tag ID:

POST
/rest/v10/Contacts/filter

body = {
   "filter":[
      {
         "tag_link.name" : "tag_name"
      }
   ]
}