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Gerando os Models

Execute os seguintes comandos:

 rails g model Category name

rails g (generate) model Category (nome do modelo) name (campo)

rails g model Review ​rating:​integer ​description:​text reviewable:​references{polymorphic} ​user:​references

O campo ( user:references ) pelo fato de ter o "references" na frente, o rails entende que ele é uma referência ao modelo user.

rails g model Favorite ​favoritable:​references{polymorphic} user:​references
​rails g model Serie title ​description:​text thumbnail_key
category:​references featured_thumbnail_key thumbnail_cover_key
​rails g model Movie title ​description:​text thumbnail_key video_key episode_number:​integer featured_thumbnail_key serie:​references{optional} ​category:​references thumbnail_cover_key

serie:references{optional} - Signfica que certo campo é opcional, poderá ter ou não, no caso, um filme/episódio pode pertencer ou não à uma série.

​rails g model Player ​start_date:​datetime ​end_date:​datetime elapsed_time:​time ​movie:​references ​user:​references
​rails g migration add_last_watched_episode_to_series last_watched_episode:​references