Ruby Shovel vs Rails Shovel

The Shovel Operator is <<.

Array#<< acts similar to Array#push. Shovel will add an element to the end of an Array.

easy peasy

Rails enhances the HECK out of the Shovel operator when using ActiveRecord::Collections. When using the Shovel operator to add to a Collection, it will populate foreign key columns or even create a record in the join table with the two foreign keys for you.

Rails automatically creates and saves the associated object.

The behavior of the shovel operator depends on what the relationship is between the ActiveRecord::Relation and the ActiveRecord object.

The shovel populates the foreign key field of the ActiveRecord Object with the foreign key that is common in the Collection.

For example, say you have two models, Director and Movie.

If you have a collection of Movie records you can use the shovel operator like so:

The shovel creates a record in the join table that populates the two foreign keys and whatever else is required and saves it.

So now say we have three models, Movie, Actor, and Character.

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