Vote from list of existing nodes I have a Content Type "Picture". The contentmanager now wants to choose specific nodes of this ContentType and put them in a voteable list. The voting list should be auto generated if possible. 
Users can vote one this list. A user can only vote once and give exactly one vote. After voting, the user should see the ranking results and within his profile he should be able to see for what he voted.

Whats the best way to achieve this? 
I thought about using flags, but I would need to restrict a flag to a number of nodes and not per node. And with standard polling I don't see a way of generating the voting list.
You need to distinct those specific nodes using taxonomy or a custom field, like a boolean field, say, 0 means no vote and 1 means needs voting. Then use the the flag module to filter those nodes. like this





UPDATE : 

The basic idea is, when user flags a content, you can set all of the 1s to 0 in this way no more content will be votable. To do so you need to use hook_flag_flag function. in this function use node_load to load the nodes of boolean value 1, set it to 0 then use node_save to save the node.