We can filter what routes are available using constraints.
There are several ways to use constraints including:
segment constraints
request based constraints
advanced constraints
example
requested based constraint to only allow a specific IP address to access a route:
See other similar examples ActionDispatch::Routing::Mapper::Scoping.
We want to do something more complex we can use more advanced constraints and create a class to wrap the logic:
One form, several submit buttons
We can also use the value of the submit tags of a form as a constraint to route to a different action. If we have a form with multiple submit buttons (eg "preview" and "submit"), We could capture this constraint directly in our routes.rb, instead of writing javascript to change the form destination URL.
Example with the commit_param_routing gem we can take advantage of rails submit_tag
Rails submit_tag first parameter lets we change the value of our form commit parameter
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