Creates a callback to automatically create an url-friendly representation of the attribute argument. Example:
act_as_url :title
will use the string contents of the title attribute to create the permalink. <strong>Note:</strong> you can also use a non-database-backed method to supply the string contents for the permalink. Just use that method's name as the argument as you would an attribute.
The default attribute acts_as_url uses to save the permalink is url but this can be changed in the options hash. Available options are:
:url_attribute |
The name of the attribute to use for storing the generated url string. Default is :url |
:scope |
The name of model attribute to scope unique urls to. There is no default here. |
:only_when_blank |
If true, the url generation will only happen when :url_attribute is blank. Default is false (meaning url generation will happen always) |
:sync_url |
If set to true, the url field will be updated when changes are made to the attribute it is based on. Default is false. |
# File lib/stringex/acts_as_url.rb, line 28 def acts_as_url(attribute, options = {}) cattr_accessor :attribute_to_urlify cattr_accessor :scope_for_url cattr_accessor :url_attribute # The attribute on the DB cattr_accessor :only_when_blank cattr_accessor :duplicate_count_separator cattr_accessor :allow_slash if options[:sync_url] before_validation(:ensure_unique_url) else if defined?(ActiveModel::Callbacks) before_validation(:ensure_unique_url, :on => :create) else before_validation_on_create(:ensure_unique_url) end end self.attribute_to_urlify = attribute self.scope_for_url = options[:scope] self.url_attribute = options[:url_attribute] || "url" self.only_when_blank = options[:only_when_blank] || false self.duplicate_count_separator = options[:duplicate_count_separator] || "-" self.allow_slash = options[:allow_slash] || false class_eval def #{url_attribute} if !new_record? && errors[attribute_to_urlify].present? self.class.find(id).send(url_attribute) else read_attribute(url_attribute) end end end
Initialize the url fields for the records that need it. Designed for people who add acts_as_url support once there's already development/production data they'd like to keep around.
Note: This method can get very expensive, very fast. If you're planning on using this on a large selection, you will get much better results writing your own version with using pagination.
# File lib/stringex/acts_as_url.rb, line 71 def initialize_urls find(:all, :conditions => {self.url_attribute => nil}).each do |instance| instance.send :ensure_unique_url instance.save end end
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