tailieunhanh - cakephp application development phần 5

và kèm theo liên quan đến công tác mô hình (thông qua quy ước đặt tên của nó) với bộ điều khiển. Chúng tôi đã có thể truy cập các mô hình công tác từ TasksController như rằng lớp mô hình là một thuộc tính điều khiển ($ this- công tác).Trong CakePHP, nói chung, bộ điều khiển đều có một lớp mô hình phụ thuộc. Đó là cách bánh là | Simpo PDF Merge and Split Unregistered Version - http Models Accessing Data More on Data Validation As we already saw we can set the validation in three ways 1. Simple validation using CakePHP s pre defined rule The general structure is as follows var validate array fieldNamel predefinedRuleName . . 2. Single rule validation It has got the following format var validate array fieldNamel array rule ruleName ruleDefinitionArray . . . . 3. Multiple rule validation We can set multiple rules per field by setting the array like the following var validate array fieldNamel array ruleNamel array rule ruleName . . ruleName2 array rule ruleName2 . . . . . . 116 Simpo PDF Merge and Split Unregistered Version - http Chapter 5 In the validate array we can associate a field with 5 keys for defining our constraints 1. rule Defines the validation method and takes either a single string or an array as value. It must be present in every validation array whereas the other keys are optional. 2. required Much like the PHP s isset function it checks whether the field is set in the data to be saved. It can be set to true to enable the checking. By default it is set to false. 3. allowEmpty It sets whether we should allow empty data to be saved for a specific field. By default it is set to false that means empty value is not allowed. We can set it to true to allow empty value to be saved for a particular field. 4. on This key specifies on which operation the validation is to be performed. We can set it to either update or create. By default it is set to null that is validation is applied for both update and save operations. 5. message It is used to set custom validation message for a rule. The message appears next to the respective web form field if the validation fails. Sometimes we may find the built-in validation rules and regular expression patterns are not enough to define our own rule. In those cases we can create a custom model method to check the .