bsw@279: function model.has_rendered_content(class, rendered_class, content_field_name)
bsw@279: 
bsw@279:   local content_field_name = content_field_name or 'content'
bsw@279:   
bsw@279:   -- render content to html, save it as rendered_class and return it
bsw@397:   function class.object:render_content(force_rendering)
bsw@279:     -- local draft for update
bsw@279:     local lock = class:new_selector()
bsw@279:       :add_where{ "id = ?", self.id }
bsw@279:       :single_object_mode()
bsw@279:       :for_update()
bsw@279:       :exec()
bsw@279:     -- check if there is already a rendered content
bsw@279:     local rendered = rendered_class:new_selector()
bsw@279:       :add_where{ class.table .. "_id = ?", self.id }
bsw@279:       :add_where{ "format = 'html'" }
bsw@279:       :optional_object_mode()
bsw@279:       :exec()
bsw@279:     if rendered then
bsw@397:       if force_rendering then
bsw@397:         rendered:destroy()
bsw@397:       else
bsw@397:         return rendered
bsw@397:       end
bsw@279:     end
bsw@279:     -- create rendered_class record
bsw@279:     local rendered = rendered_class:new()
bsw@279:     rendered[class.table .. "_id"] = self.id
bsw@279:     rendered.format = "html"
bsw@279:     rendered.content = format.wiki_text(self[content_field_name], self.formatting_engine)
bsw@279:     rendered:save()
bsw@279:     -- and return it
bsw@279:     return rendered
bsw@279:   end
bsw@279: 
bsw@279:   -- returns rendered version for specific format
bsw@279:   function class.object:get_content(format)
bsw@279:     -- Fetch rendered_class record for specified format
bsw@279:     local rendered = rendered_class:new_selector()
bsw@279:       :add_where{ class.table .. "_id = ?", self.id }
bsw@279:       :add_where{ "format = ?", format }
bsw@279:       :optional_object_mode()
bsw@279:       :exec()
bsw@279:     -- If this format isn't rendered yet, render it
bsw@279:     if not rendered then
bsw@279:       rendered = self:render_content()
bsw@279:     end
bsw@279:     -- return rendered content
bsw@279:     return rendered.content
bsw@279:   end
bsw@279: 
bsw@279: end