On Friday, October 12, 2018 at 9:07:05 AM UTC-7, Jeff Dyck wrote: > > I’m hoping someone can help me with a strange glitch I’ve run into… > > > I've spent a bunch of time narrowing down the issue, and *think* the > problem is with a table which has a foreign key field named “model”. > Unfortunately > it's a legacy database so I can’t just change the field name to fix the > issue. > > > In my attempts to resolve the issue I have added a column alias of > :model_id pointing to :model, then specified :model_id as the association > key – that initially fixed all my issues, but now I've found instances > where that causes other problems which get fixed if I change the key back > to :model, which then breaks the original queries. > > > While I'm feeling a bit stumped, I've narrowed the scope down to two > different errors which alternate depending on whether I use :model or > :model_id as the association key. > > > I have the following tables and relationships defined (extraneous fields > removed for clarity). Note, I have this database and models wrapped in a > module Inventory to keep it separate from another database my application > requires access to, hence the references to "Inventory::Device" and such. > > > Device (tbl_equipment) > ------------------------------- > - id_equipment (key) > - model (foreign key for models) > > def_column_alias(:model_id, :model) > > many_to_one :device_model, :key=>:model_id, :primary_key=>:id_model, : > class=>'Inventory::Device_Model', :select=>[:id_model, :model_description, > :apple_model_number, :type] > > > Device_Model (tbl_model) > --------------------------------- > - id_model (key) > > one_to_many :devices, :key => :model_id, :primary_key => :id_model, :class > =>'Inventory::Device' > > > You probably want:
many_to_one :device_model, :key=>:model_id, :key_column=>:model, :primary_key=>:id_model, :class=>'Inventory::Device_Model', :select=>[:id_model, :model_description, :apple_model_number, :type] one_to_many :devices, :key => :model, :key_method=>:model_id, :primary_key => :id_model, :class=>'Inventory::Device' See http://sequel.jeremyevans.net/rdoc/files/doc/association_basics_rdoc.html#label-Associations+Based+on+SQL+Expressions+Options You probably also want to use the column_conflicts plugin: http://sequel.jeremyevans.net/rdoc-plugins/classes/Sequel/Plugins/ColumnConflicts.html If you still run into problems, please post back with the details. Thanks, Jeremy -- You received this message because you are subscribed to the Google Groups "sequel-talk" group. To unsubscribe from this group and stop receiving emails from it, send an email to sequel-talk+unsubscr...@googlegroups.com. To post to this group, send email to sequel-talk@googlegroups.com. Visit this group at https://groups.google.com/group/sequel-talk. For more options, visit https://groups.google.com/d/optout.
