I want to expose Idea's in Communities using Napili template. I dont see this object being exposed there. Any idea if this is even possible or not ? Any workaround of doing it if it is not possible ?
yes. you can. there is free component on AppExchange https://appexchange.salesforce.com/listingDetail?listingId=a0N3A00000E9l50UAB
Idea's is currently not supported in Napili template .Please check this idea and upvote .
There is a workaround .As Napili is built on lightning component framework you can build your own lightning component on Top of standard SFDC Idea Object .
If you have access to lightning DEVS you can build your own lightning component or wait for a component on appexchange .