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28 lines
1.4 KiB
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28 lines
1.4 KiB
Plaintext
Model
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=====
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A model is an instance of [CModel] or a class that extends [CModel]. Models are
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used to keep data and their relevant business rules.
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A model represents a single data object. It could be a row in a database
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table or an html form with user input fields. Each field of the data object is
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represented by an attribute of the model. The attribute has a label and can
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be validated against a set of rules.
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Yii implements two kinds of models: Form models and active records. They
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both extend from the same base class, [CModel].
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A form model is an instance of [CFormModel]. Form models are used to store
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data collected from user input. Such data is often collected, used and
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then discarded. For example, on a login page, we can use a form model to
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represent the username and password information that is provided by an end
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user. For more details, please refer to [Working with Forms](/doc/guide/form.overview)
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Active Record (AR) is a design pattern used to abstract database access in
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an object-oriented fashion. Each AR object is an instance of
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[CActiveRecord] or of a subclass of that class, representing a single row in a
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database table. The fields in the row are represented as properties of the AR
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object. Details about AR can be found in [Active Record](/doc/guide/database.ar).
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For the best practices on defining your models check [Best MVC Practices](/doc/guide/basics.best-practices),
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Model section. |