2009/5/31 Frederick Cheung <[email protected]>: > > > > On May 31, 1:41 am, Matt Smart <[email protected]> wrote: >> Hello, >> >> I'm new to the group, and still learning rails. I am a C++ programmer >> by trade, so I'm finding some of the rails semantics confusing. When I >> come accross a statement like this: >> >> <%= link_to_function "clickme" do |page| ... >> >> ... and then a few lines that I do understand, could someone explain >> to me the following: the link_to_function function takes some object >> for the rendered link, and then what? it's supposed to be *args, and >> then &block. I assume that the code that comes afterward is the >> reference to a block of text, but how does the args part work? Also, >> in this instance, how does the do evaluate |page|? and last: where in >> the rails API docs is the reference for the page object? > > *args means that you can pass it as many arguments as you want (and if > you were writing such a function then args would be an array > containing those options). That doesn't necessarily mean that the > function will do something sensible if you pass it 23 arguments (to > know that you need to read the docs for it) > > &block is basically just the block you give the function (and the fact > that it's there in the docs is probably a bit of an artefact of rdoc - > you can pass a block to any method (again, no guarantees on what that > method will do with it). The 'do' doesn't evaluate page, that's just > you giving a name to the object that link_to_function yields to you > (which is an instance of JavaScriptGenerator or something similar). > > You might find it easier to get a solid grounding in ruby first before > starting to fiddle around with rails.
I would not say that is necessary to get a 'solid' grounding in Ruby before fiddling with Rails. I successfully got going with my fiddling, learning both at the same time. (Though I continue to make errors in both areas of course). The book Agile Web Development with Rails (you want the 3rd edition) does a good job of introducing rails to those without prior knowledge of Ruby. Colin > > Fred >> >> I'm sure someone well versed in ruby can explain this to me. Thankyou >> for any help. Even links to documentation that explains these ruby >> operators would help. Thanks again, >> >> Matt > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
