< Ruby on Rails
ActiveRecord - The Model
- See the way the models are named and what names to avoid
- How to get your data inside the database in a convenient way
- Connect different models together
- Read about how to manipulate your data at certain states of their existence
- Check your input for their correctness
- How to look up different criteria without writing SQL
- Write advanced aggregations inside your model
- Do basic mathematical calculations with your data
- Extend functionality with acts_as
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