I had the same problem to show an user detail from my application.
You can do this:
<Link to={'/ideas/'+this.props.testvalue }>Create Idea</Link>
or
<Link to="ideas/hello">Create Idea</Link>
and
<Route name="ideas/:value" handler={CreateIdeaView} />
to get this via this.props.match.params.value
at your CreateIdeaView class.
You can see this video that helped me a lot: https://www.youtube.com/watch?v=ZBxMljq9GSE