Data types
The MV framework supports the following 20 data types for building models: bool, int, float, char, url, redirect, email, phone, password, text, enum, parent, order, date, date_time, image, multi_images, file, many_to_one, many_to_many.
Based on the data types in the PHP class, the data types of the fields in the SQL tables are set using migrations.
- General characteristics
 - Boolean bool
 - String char
 - Numeric: int, float, order
 - Special string: url, redirect, email, phone
 - Password password
 - Text text
 - Date and time: date, date_time
 - File and image: file, image
 - Array of images multi_images
 - Choice enum
 - Parent parent
 - Many to one many_to_one
 - Many to many many_to_many
 - Group group
 
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General principles of models