Ruby on Rails

Hi, I'm a novice and could use help with a join table question. I have
a join table "galleries_questions".

I can't figure out how to query it for pictures in a selected gallery.

Controller:
@gallery = Gallery.where("minisection_id" =>
session[:minisection_id]).first
@pictures = Gallery.find(@gallery).pictures

View:
<% @pictures.each do |picture| %>
<%= image_tag picture.image_url.to_s %>

ERROR:
PGError: ERROR: column pictures.gallery_id does not exist
LINE 1: SELECT "pictures".* FROM "pictures" WHERE "pictures"."galle...
^
: SELECT "pictures".* FROM "pictures" WHERE "pictures"."gallery_id" =
11

Any suggestions?

Thanks

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