Class TopicReplies

Returns the static model of the specified AR class.

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Returns the validation rules for attributes.

This method should be overridden to declare validation rules. Each rule is an array with the following structure:

array('attribute list', 'validator name', 'on'=>'scenario name', ...validation parameters...)

where

• attribute list: specifies the attributes (separated by commas) to be validated;
• validator name: specifies the validator to be used. It can be the name of a model class method, the name of a built-in validator, or a validator class (or its path alias). A validation method must have the following signature:

  // $params refers to validation parameters given in the rule
  function validatorName($attribute,$params)
  

  A built-in validator refers to one of the validators declared in CValidator::builtInValidators. And a validator class is a class extending CValidator.
• on: this specifies the scenarios when the validation rule should be performed. Separate different scenarios with commas. If this option is not set, the rule will be applied in any scenario that is not listed in "except". Please see scenario for more details about this option.
• except: this specifies the scenarios when the validation rule should not be performed. Separate different scenarios with commas. Please see scenario for more details about this option.
• additional parameters are used to initialize the corresponding validator properties. Please refer to individual validator class API for possible properties.

The following are some examples:

array(
    array('username', 'required'),
    array('username', 'length', 'min'=>3, 'max'=>12),
    array('password', 'compare', 'compareAttribute'=>'password2', 'on'=>'register'),
    array('password', 'authenticate', 'on'=>'login'),
);

Note, in order to inherit rules defined in the parent class, a child class needs to merge the parent rules with child rules using functions like array_merge().

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'behaviorName'=>array(
    'class'=>'path.to.BehaviorClass',
    'property1'=>'value1',
    'property2'=>'value2',
)

Returns a list of behaviors that this model should behave as. The return value should be an array of behavior configurations indexed by behavior names. Each behavior configuration can be either a string specifying the behavior class or an array of the following structure:

'behaviorName'=>array(
    'class'=>'path.to.BehaviorClass',
    'property1'=>'value1',
    'property2'=>'value2',
)

Note, the behavior classes must implement IBehavior or extend from CBehavior. Behaviors declared in this method will be attached to the model when it is instantiated.

For more details about behaviors, see CComponent.

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Overrides

This method should be overridden to declare related objects.

There are four types of relations that may exist between two active record objects:

• BELONGS_TO: e.g. a member belongs to a team;
• HAS_ONE: e.g. a member has at most one profile;
• HAS_MANY: e.g. a team has many members;
• MANY_MANY: e.g. a member has many skills and a skill belongs to a member.

Besides the above relation types, a special relation called STAT is also supported that can be used to perform statistical query (or aggregational query). It retrieves the aggregational information about the related objects, such as the number of comments for each post, the average rating for each product, etc.

Each kind of related objects is defined in this method as an array with the following elements:

'varName'=>array('relationType', 'className', 'foreignKey', ...additional options)

where 'varName' refers to the name of the variable/property that the related object(s) can be accessed through; 'relationType' refers to the type of the relation, which can be one of the following four constants: self::BELONGS_TO, self::HAS_ONE, self::HAS_MANY and self::MANY_MANY; 'className' refers to the name of the active record class that the related object(s) is of; and 'foreignKey' states the foreign key that relates the two kinds of active record. Note, for composite foreign keys, they can be either listed together, separated by commas or specified as an array in format of array('key1','key2'). In case you need to specify custom PK->FK association you can define it as array('fk'=>'pk'). For composite keys it will be array('fk_c1'=>'pk_с1','fk_c2'=>'pk_c2'). For foreign keys used in MANY_MANY relation, the joining table must be declared as well (e.g. 'join_table(fk1, fk2)').

Additional options may be specified as name-value pairs in the rest array elements:

• 'select': string|array, a list of columns to be selected. Defaults to '*', meaning all columns. Column names should be disambiguated if they appear in an expression (e.g. COUNT(relationName.name) AS name_count).
• 'condition': string, the WHERE clause. Defaults to empty. Note, column references need to be disambiguated with prefix 'relationName.' (e.g. relationName.age>20)
• 'order': string, the ORDER BY clause. Defaults to empty. Note, column references need to be disambiguated with prefix 'relationName.' (e.g. relationName.age DESC)
• 'with': string|array, a list of child related objects that should be loaded together with this object. Note, this is only honored by lazy loading, not eager loading.
• 'joinType': type of join. Defaults to 'LEFT OUTER JOIN'.
• 'alias': the alias for the table associated with this relationship. It defaults to null, meaning the table alias is the same as the relation name.
• 'params': the parameters to be bound to the generated SQL statement. This should be given as an array of name-value pairs.
• 'on': the ON clause. The condition specified here will be appended to the joining condition using the AND operator.
• 'index': the name of the column whose values should be used as keys of the array that stores related objects. This option is only available to HAS_MANY and MANY_MANY relations.
• 'scopes': scopes to apply. In case of a single scope can be used like 'scopes'=>'scopeName', in case of multiple scopes can be used like 'scopes'=>array('scopeName1','scopeName2'). This option has been available since version 1.1.9.

The following options are available for certain relations when lazy loading:

• 'group': string, the GROUP BY clause. Defaults to empty. Note, column references need to be disambiguated with prefix 'relationName.' (e.g. relationName.age). This option only applies to HAS_MANY and MANY_MANY relations.
• 'having': string, the HAVING clause. Defaults to empty. Note, column references need to be disambiguated with prefix 'relationName.' (e.g. relationName.age). This option only applies to HAS_MANY and MANY_MANY relations.
• 'limit': limit of the rows to be selected. This option does not apply to BELONGS_TO relation.
• 'offset': offset of the rows to be selected. This option does not apply to BELONGS_TO relation.
• 'through': name of the model's relation that will be used as a bridge when getting related data. Can be set only for HAS_ONE and HAS_MANY. This option has been available since version 1.1.7.

Below is an example declaring related objects for 'Post' active record class:

return array(
    'author'=>array(self::BELONGS_TO, 'User', 'author_id'),
    'comments'=>array(self::HAS_MANY, 'Comment', 'post_id', 'with'=>'author', 'order'=>'create_time DESC'),
    'tags'=>array(self::MANY_MANY, 'Tag', 'post_tag(post_id, tag_id)', 'order'=>'name'),
);

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This method is invoked before saving a record (after validation, if any). The default implementation raises the CActiveRecord::onBeforeSave() event. You may override this method to do any preparation work for record saving. Use isNewRecord to determine whether the saving is for inserting or updating record. Make sure you call the parent implementation so that the event is raised properly.

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This method is invoked after saving a record successfully. The default implementation raises the CActiveRecord::onAfterSave() event. You may override this method to do postprocessing after record saving. Make sure you call the parent implementation so that the event is raised properly.

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