Rails schema not updating

For example, if your application includes authors and books, and each book can be assigned to exactly one author, you'd declare the book model this way: model, you would be told that there was an "uninitialized constant Book:: Authors".This is because Rails automatically infers the class name from the association name.

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This object will be instantiated from the passed attributes, and the link through this object's foreign key will be set, but the associated object will method returns a new object of the associated type.

For example, if a document has many sections, and a section has many paragraphs, you may sometimes want to get a simple collection of all paragraphs in the document.

You could set that up this way: association creates a direct many-to-many connection with another model, with no intervening model.

In this case, the column definition might look like this: association.

This association indicates that each instance of the model has zero or more instances of another model.

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