Polymorphic association is a term used in discussions of Object-Relational Mapping with respect to the problem of representing in the relational database domain, a relationship from one class to multiple classes.
I have a Products table and want to add a column: t.references :imageable, :polymorphic => true I was trying …
ruby-on-rails polymorphic-associations rails-migrationsWell here's my problem I have three tables; regions, countries, states. Countries can be inside of regions, states can be …
mysql polymorphic-associationsI am using polymorphic associations to track Comments in my project. All very straight forward stuff. The problem I have …
ruby-on-rails ruby activerecord polymorphic-associationsWhy can you not have a foreign key in a polymorphic association, such as the one represented below as a …
ruby-on-rails database foreign-key-relationship polymorphic-associationsMy question is essentially the same as this one: Polymorphic Association with multiple associations on the same model However, the …
ruby-on-rails polymorphic-associationsI'm pulling some data from an external API and would like to cache the results locally. I have a class …
ruby-on-rails activerecord polymorphic-associationsI try to create a polymorphic association, what is common in Rails but unfortunately not in Yii2. As part of …
yii2 has-many polymorphic-associations relationI would like set up a polymorphic relation with accepts_nested_attributes_for. Here is the code: class Contact <…
ruby-on-rails ruby polymorphic-associations nested-attributesI have following comments table in my app: comments -------- id INT foreign_id INT model TEXT comment_text TEXT ... …
mysql sql database-design foreign-keys polymorphic-associationsThe usual way of setting a foreign key constraint is to choose which table the foreign key will point to. …
mysql database postgresql polymorphic-associations