Change deep_merge to Utils.deep_merge_hashes - ruby

Question

I am using Octopress to generate static html pages. I tried to change the language of the dates using this instruction (it is in German but we need only the code). When I copy date.rb from this German website to my octopress/plugins, I have the following error: Liquid Exception: undefined method `deep_merge' for # in blog/path/to/post/index.html.
I can generate site if I comment out this part in date.rb:
def to_liquid
date_format = self.site.config['date_format']
self.data.deep_merge({
"title" => self.data['title'] || self.slug.split('-').select {|w| w.capitalize! || w }.join(' '),
"url" => self.url,
"date" => self.date,
# Monkey patch
"date_formatted" => format_date(self.date, date_format),
"updated_formatted" => self.data.has_key?('updated') ? format_date(self.data['updated'], date_format) : nil,
"id" => self.id,
"categories" => self.categories,
"next" => self.next,
"previous" => self.previous,
"tags" => self.tags,
"content" => self.content })
end
Then the language is changed for the dates in blog/archives, but not for the dates in posts. I found a similar problem which has been solved by changing deep_merge → Utils.deep_merge_hashes. So I understand that I need to do exactly the same in the piece of the code I presented above. I think it should be quite easy, but since I don't know Ruby, I didn't succeed yet. Could you please tell me how should I use Utils.deep_merge_hashes instead of deep_merge in this case?

Answer 1

This works (ruby 2.1.1 - Jekyll 2.5.3)
def to_liquid(attrs = nil)
date_format = self.site.config['date_format']
new_datas = {
"title" => self.data['title'] || self.slug.split('-').select {|w| w.capitalize! || w }.join(' '),
"url" => self.url,
"date" => self.date,
# Monkey patch
"date_formatted" => format_date(self.date, date_format),
"updated_formatted" => self.data.has_key?('updated') ? format_date(self.data['updated'], date_format) : nil,
"id" => self.id,
"categories" => self.categories,
"next" => self.next,
"previous" => self.previous,
"tags" => self.tags,
"content" => self.content }
Utils.deep_merge_hashes(self.data, new_datas)
end