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Drills : Search by a HAS_MANY relation in Yii 1.1

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Drills : Search by a HAS_MANY relation in Yii 1.1

Category unchanged

Tutorials

Yii version changed

1.1

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search,has_many, search, CActiveRecord

Content changed

[...]
## Example of HAS_MANY

Think about blog posts and their authors. It's a relation of "An Author has many Posts" and "A Post belongs to an Author" at the same time.


 ```php

/**
* Author model
[...]
```


 ```php

/**
* Post model
[...]
I want to start with an easy one. Let's retrieve all the posts that has a cirtain word in their title.


 ```php

public static function GetPostsByTitle($searchWord)
{
[...]
Now we have to retrieve the authors' name, too.


 ```php

public static function GetPostsWithAuthorByTitle($searchWord)
{
[...]
So you can write like this when you want to search by Author's name.


 ```php

...
// compare Author's name
[...]
Now we will retrieve the authors, not the posts.


 ```php

public static function GetAuthorsByPostTitle($searchWord)
{
[...]
### Wrong Answer


 ```php

public static function GetAuthorsWithPostsByPostTitle($searchWord)
{
[...]
### Answer


 ```php

public static function GetAuthorsWithPostsByPostTitle($searchWord)
{
[...]
### Trial #1


 ```php

public static function GetTop5AuthorsWithPostsByPostTitle($searchWord)
{
[...]
### Trial #2


 ```php

...
// force to join Post
[...]
But, alas, you will get the strange output like this:

~~~```
[search word = foo]
Author = Andy
[...]
Post = What's foo?
[end]
~~~```

We want to show 5 authors, but the list ends where the count of posts sums up to 5.
[...]
### Trial #3


 ```php

...
// force to join Post (without selecting)
[...]
### Trial #4


 ```php

...
// force to join Post (without selecting)
[...]
### Answer


 ```php

public static function GetTop5AuthorsWithPostsByPostTitle($searchWord)
{
[...]
### Example of Answer


 ```php

public static function GetTop5AuthorsWithPostsByPostTitle($searchWord)
{
[...]
### Optimized Answer to Task #4


 ```php

public function relations()
{
[...]
### Optimized Answer to Task #5


 ```php

public static function GetTop5AuthorsWithPostsByPostTitle($searchWord)
{
[...]
### Optimized Answer to Task #6


 ```php

public static function GetTop5AuthorsWithPostsByPostTitle($searchWord)
{
// query criteria
$criteria = new CDbCriteria();
// join Post model (one for fetching data, the other for filtering)
[...]
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Viewed: 77 948 times
Version: 1.1
Category: Tutorials
Tags: CActiveRecord, has_many, search
Written by: softark
Last updated by: softark
Created on: Dec 6, 2012
Last updated: 6 years ago
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