ruby on rails - Merge associated items from an activerecord relation result -

how combine example tag.has_many :images, through: :taggings bunch of tags?

something around unless theres simpler:

images = ??? tag.where("name in (?)", tag_params).each |tag|   images = images.merge(tag.images) end 

how about:

images = image.joins(:tags).where(['tags.id in (?)', tag_params]) 

?