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CHAPTER 10 EXTENDING RAILS WITH PLUGINS
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# The instance method, say_hello, will be available to the Bar class b = Bar.new b.say_hello # => hello # The say_cheers class method now exists on Bar Bar.say_cheers # => cheers
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For our plugin, we want simply_searchable to be available as a class method inside our controllers, so we use the technique demonstrated in the preceding example. We create a module called ClassMethods and use extend in the included hook to make its methods available as class methods on the receiving class. Here s how it looks:
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module BeginningRails module SimplySearchable def self.included(base) base.extend ClassMethods end module ClassMethods def simply_searchable(options = {}) class_inheritable_accessor :fields, :template raise "Please specify the fields to search on" unless options[:fields] self.fields = options[:fields] self.template = options[:template] || 'index' include SearchMethods end end end end
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The ClassMethods module has a single method called simply_searchable, which is the class method we ll use in our controllers to declare them as searchable. The simply_searchable method accepts a hash of options that will allow us to provide some configuration parameters to customize the search. The first value accepted by the options hash is called fields, and will include a list of database fields on which to search. This is a required parameter, so we raise an exception if it s empty. The second value specified by the options hash is called template. We ll use this option to specify which template to render in response to the search, defaulting to index if it s not set.
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CHAPTER 10 EXTENDING RAILS WITH PLUGINS
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Now that we ve got the setup covered, it s time to write the code that performs the actual search what the user will reach when calling /events/search after we add the plugin to the EventsController. We required the plugin user to specify the fields for the search. Since the search parameters that come in via the params hash might include fields not specified, we need to do a little filtering. If we didn t do this, our query might include fields we don t want to expose publicly, which would be a security concern. With the parameters we want, we create conditions and values arrays, to which we add the criteria for our search.
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module SearchMethods def search # Initialize the conditions and values arrays conditions = [] values = [] # Filter out all params that don't match the specified fields searchable_fields = params.reject {|k,v| !self.fields.include (k) } # Build the conditions and values arrays from the parameters searchable_fields.each_pair do |field, value| conditions << "#{field} LIKE " values << "%#{value}%" end end end
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At this point, we know the fields and values on which we ll perform the search. However, because this code has no idea what it needs to search for, the approach we will take is to run a search in the model that corresponds to a controller. This means that for the EventsController, we ll be performing searches in the Event model. By following this convention, we ll be able to reuse the plugin in other controllers without requiring changes to the plugin, The new parts are in bold.
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module SearchMethods def search # Initialize the conditions and values arrays conditions = [] values = [] # Filter out all params that don't match the specified fields searchable_fields = params.reject {|k,v| !self.fields.include (k) }
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CHAPTER 10 EXTENDING RAILS WITH PLUGINS
# Build the conditions and values arrays from the parameters searchable_fields.each_pair do |field, value| conditions << "#{field} LIKE " values << "%#{value}%" end # Get the model class name from the controller class name model_name = self.class.name.chomp('Controller').singularize # Create a variable named after the controller variable_name = "@#{self.controller_name.pluralize}" end end
Note While we re inferring the model name from the controller name here, you might consider making
the options hash accept a :model parameter to specify the model explicitly in the event that the model you want to search on can t be inferred.
We needed to do some work to figure out the name of the model on which we want to search, and created an instance variable to hold the resultset. With that out of the way, we have everything we need to perform the search. Let s do that now. Again, the new parts are in bold.
module SearchMethods def search # Initialize the conditions and values arrays conditions = [] values = [] # Filter the params to have only the specified fields searchable_fields = params.reject {|k,v| !self.fields.include (k) } # Add each field to the conditions array searchable_fields.each_pair do |field, value| conditions << "#{field} LIKE " values << "%#{value}%" end
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