Environment: SharePoint Online
I use Rest api to communicate with my lists. I must now, show a list which joins 3 lists:
List1 : ID, Title, Field1_Loockup(List2.ID)
List2 : ID, Title, Field2_Loockup(List3.ID)
List3 : ID, Title
I want like result :
List1.ID | List1.Title | List2.ID | List2.Title | List3.ID | List3.Title
How can I do?
You can try using the expand clause
http://siteurl/_api/web/lists/getbytitle('listname')/items?$select=id,title,field1_lookup/id,field1_lookup/title&$expand=field1_lookup
I am not sure if it's possible to expand the second level i.e field2_lookup but you can try
http://siteurl/_api/web/lists/getbytitle('listname')/items?$select=id,title,field1_lookup/id,field1_lookup/title,field1_lookup/field2_lookup/id,field1_lookup/field2_lookup/title&$expand=field1_lookup,field1_lookup/field2_lookup
$expand does not work in second level. The reason is SP does not support nested query.
I would suggest using Content search webpart which will be a huge boost to your application.
If all the list have same content type then search on the basis of that else use OR condition for the different content types.
In the display template you can easily manipulate the data to show in which ever fashion you want.