5.5 ActiveRecord Relationships

• ActiveRecord establishes relationships between tables in the model files
• Basic ActiveRecord relationships:
  1. belongs_to - one to one relationship
  2. has_many - one to many relationship
  3. has_many through: - one to many relationship through a join table

More complex relationships

When you want to be more explicit in naming properties you would have to use some of the following ActiveRecord declarations:

1. class_name: - when you use a different name for a model you need to tell ActiveRecord what model to use
2. foreign_key: - when you use a different name for a model id in your table you need to tell ActiveRecord what value in your table to use instead
3. source: - when you go through a table and use a different name for a model id you need to tell ActiveRecord what value in the table to use instead

Documentation

ActiveRecord Documentation is very easy to read and understand! If you have any questions about ActiveRecord look at the documentation. If you need any help let me know! ~Adriana

Documentation: http://edgeguides.rubyonrails.org/association_basics.html