engine/app/models/snippet.rb

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class Snippet
include Locomotive::Mongoid::Document
## fields ##
field :name
field :slug
field :template
## associations ##
referenced_in :site
## callbacks ##
before_validation :normalize_slug
after_save :update_templates
after_destroy :update_templates
# TODO: after_save callback to let pages embedding this snippet know about the changes the user has just made.
## validations ##
validates_presence_of :site, :name, :slug, :template
validates_uniqueness_of :slug, :scope => :site_id
## methods ##
protected
def normalize_slug
self.slug = self.name.clone if self.slug.blank? && self.name.present?
self.slug.slugify!(:without_extension => true, :downcase => true) if self.slug.present?
end
def update_templates
pages = self.site.pages.any_in(:snippet_dependencies => [self.slug]).to_a
pages.each do |page|
self._change_snippet_inside_template(page.template.root)
page.send(:_serialize_template) && page.save
end
end
def _change_snippet_inside_template(node)
case node
when Locomotive::Liquid::Tags::Snippet
node.refresh(self) if node.slug == self.slug
when Locomotive::Liquid::Tags::Block
self._change_snippet_inside_template(node.parent) if node.parent
else
if node.respond_to?(:nodelist)
node.nodelist.each do |child|
self._change_snippet_inside_template(child)
end
end
end
end
end