I want to create a class method
for a class inherits ActiveRecord:Base
.
What the method need to do is add where clauses based on the options and it works well.
class Article < ActiveRecord::Base
def self.list_by_params(params={})
articles = self
articles = articles.where(author_id: params[:author_id]) unless params[:author_id].blank?
articles = articles.where(category_id: params[:category_id]) unless params[:category_id].blank?
articles = articles.where("created_at > ?", params[:created_at].to_date) unless params[:created_at].blank?
articles
end
end
This code works fine in case of the call such as:
articles = Article.list_by_params({author_id: 700})
#=> Works fine as I expected.
articles = Article.joins(:authors).list_by_params({author_id: 700})
#=> Works fine as I expected.
However, the problem is that, if I want to call the list_by_params
without filtering params, then it lose its former relations. For example:
articles = Article.joins(:authors).list_by_params({})
#=> articles is just a `Article` (not an ActiveRecord_Relation) class itself without joining :authors.
Is there any chance that I made a mistake?
Thanks in advance.
For the self explanation, I've solved the problems by using
where(nil)
.Actually,
Model.scoped
returned anonymous scope but the method has been deprecated since Rails version 4. Now,where(nil)
can replace the functionality.