Rails link_to path with dynamic variable (read from database)

Question

I'm currently developing a Rails Application with a large set of engines.

I have some paths to Engines root-path stored in a database.

However, if I try to link to them using the value from the database (it's stored in the 'root_path'-Field) and the link_to helper in the view I don't get the correct link.

Here's an example (assume that the root_path in the database is currently foo_engine.bar_path)

- @engines.each do |engine|
  = link_to engine.name, engine.root_path

instead of:

http://localhost:3000/foo_engine.bar_path

I get

http://localhost:3000/current_engine/foo_engine.bar_path

Thank you in advance

Philipp

can you do rake routes in the terminal and post the result? — Jason Kim
– Jason Kim, Commented Aug 30, 2013 at 20:56
Thank you! The problem is that I want to route to a different engine and the path to the engine is stored in the database. — pmuens
– pmuens, Commented Aug 30, 2013 at 20:57
Ah sorry. I just want to say thank you that you tried to help me :-) The problem is still there :-D — pmuens
– pmuens, Commented Aug 30, 2013 at 21:03

pmuens · Accepted Answer · 2013-08-30 21:27:11Z

1

Ok, I've found a solution for this one.

Just use

- @engines.each do |engine|
  = link_to engine.name, eval(engine.root_path)

But eval is evil. Is there another way?

answered Aug 30, 2013 at 21:27

pmuens

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2 Comments

Jason Kim Over a year ago

I think this use of eval is safe. You are not using eval on user submitted content. Have you tried "/#{engine.root_path}"

pmuens Over a year ago

Thank you for your comment! I just have tried your suggestion. "#/{engine.root_path}". Unfortunately it's not working since the conversion from the helper-Method to the url get's not triggered.

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