Advanced Rails Recipes by Mike Clark

By Mike Clark

From the writer of the crucial Rails Recipes , and with the aid of a brand new grasp Rails chef within the kitchen, listed below are seventy two new how you can kick your Ruby on Rails apps up a notch. extra Rails Recipes is a suite of useful recipes for dressing up your internet program with little fuss. you will find out how the professionals have solved the cruel difficulties utilizing the main state-of-the-art Rails suggestions so that you can convey your beautiful net app faster and more uncomplicated.

builders by way of the millions are coming to Rails-the advantages are transparent, either to participants and their enterprises.

yet how can a developer be anticipated to write down idiomatic, potent Rails code whilst the expertise is so new? the answer's to paintings along masters, humans who have been there from the beginning (and who've the scars to end up it). And, what larger solution to examine from their adventure than to examine their code and browse their causes of why it truly is written that approach? or even higher think if that code could be lifted and put correct into your individual software.

this is often higher than simply cut-and-paste: the recipe structure ability you will comprehend the code, and be capable to regulate it to fit your wishes. And the checklist of recipes is so extensive that you are guaranteed to locate tips and methods the place you are going to say "Oh! that is how they do that," or, "I did not understand you may do this in Rails."

With extra Rails Recipes , a following as much as the preferred unique Rails Recipes , you could cook dinner up a storm.

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Example text

5. " redirect_to new_session_url end This is all pretty standard authentication stuff, with the exception of being able to call the new_session_url route helper to generate the URL back to the new action. erb <% form_tag session_path do -%>

<%= text_field_tag :login, params[:login] %>

<%= password_field_tag :password, params[:password] %>

<%= submit_tag 'Log in' %>

<% end -%> 34 5.

Solution First, we need to collect all the SQL generated by Active Record. That seems difficult to do across all databases, given that Rails uses database-specific adapters to execute SQL operations. However, capturing the SQL turns out to be remarkably easy. Every database adapter logs the SQL being run by calling the log_info method in the AbstractAdapter class. We’ll just intercept that call and squirrel away the SQL statements. debug? queries << sql log_info_without_trace(sql, name, runtime) end alias_method_chain :log_info, :trace end end 11.

For example, say we’ve used our web application to whip up some slick data for an upcoming sales demo. We’ve created new accounts, added 1. html 12. U SE F IXTURES FOR C ANNED D ATASETS some goodies to each account, and formed other model relationships. Now we just need to preserve the state of the database in a set of fixtures (a dataset). mkdir_p path models_to_include = ENV['INCLUDE' ] ? empty? to_fixture(path) end end end To dump the dataset from our development database, we use this: $ rake db:dataset:dump_fixtures DATASET=demo This dumps a set of Active Record models into the appropriate fixtures in the db/dataset/demo directory.

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