Is this something you'd like to maintain automatically, or just do once? You 
remember how to use the console (if the latter)? 

Picture.find_each do |pic|
  pic.update caption: pic.item.caption
end

If you want to do it every time you save a new picture, then you can add a 
similar helper to the Picture model, and call it in a before_save callback:

def cache_caption
  self.caption = item.caption
end

before_save :cache_caption

Walter

> On Sep 14, 2019, at 4:45 AM, fugee ohu <[email protected]> wrote:
> 
> I have a table of items and a table a pictures table They relate to each 
> other through an item_pictures table having model name item_picture All my 
> items have titles but I just added captions to my pictures table and now I 
> wanna update all the records in pictures to set the captions column to the 
> value of each picture's item's title 
> 
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