I'm trying to better understand how CI works.
This is my first table, app_news:
id / name
My second is app_news_comments:
id / id_news / comment
The model I use in order to display news informations is:
public function get_news($where = array()) {
return $this->db->select('*')
->from('app_news')
->where($where)
->get()
->result();
}
The model I use in order to count comments for a news is:
public function count_comment($id_news) {
return (int) $this->db->where(array('id_news' => $id_news)
->count_all_results('app_news_comments');
}
The first solution I have is to print a foreach on my view and putting the count_comment function inside the loop in order to count how much comments I have however I won't respect the MVC pattern. How can I do so ?
The best way to get that information is using this query:
SELECT
app_news.id,
app_news.name,
COUNT(app_news_comments.id)
FROM app_news_comments
JOIN app_news ON app_news_comments.id_news = app_news.id
GROUP BY app_news_comments.id_news
So, you need to create a query using Active Record on Codeigniter or you could add the directly, because Active Record on Codeigniter have some restrictions.
However, you could use this way on Codeigniter to create the query:
$this->db->select('[YOUR FIELDS AND COUNT]', FALSE)
->from('app_news_comments') .... etc
and to add the query directly:
$this->db->query('[QUERY HERE]');
I hope this help you.
Related
I want to limit related records from
$categories = Category::with('exams')->get();
this will get me exams from all categories but what i would like is to get 5 exams from one category and for each category.
Category Model
public function Exams() {
return $this->hasMany('Exam');
}
Exam Model
public function category () {
return $this->belongsTo('Category');
}
I have tried couple of things but couldnt get it to work
First what i found is something like this
$categories = Category::with(['exams' => function($exams){
$exams->limit(5);
}])->get();
But the problem with this is it will only get me 5 records from all categories. Also i have tried to add limit to Category model
public function Exams() {
return $this->hasMany('Exam')->limit(5);
}
But this doesnt do anything and returns as tough it didnt have limit 5.
So is there a way i could do this with Eloquent or should i simply load everything (would like to pass on that) and use break with foreach?
There is no way to do this using Eloquent's eager loading. The options you have are:
Fetch categories with all examps and take only 5 exams for each of them:
$categories = Category::with('exams')->get()->map(function($category) {
$category->exams = $category->exams->take(5);
return $category;
});
It should be ok, as long as you do not have too much exam data in your database - "too much" will vary between projects, just best try and see if it's fast enough for you.
Fetch only categories and then fetch 5 exams for each of them with $category->exams. This will result in more queries being executed - one additional query per fetched category.
I just insert small logic inside it which is working for me.
$categories = Category::with('exams');
Step 1: I count the records which are coming in response
$totalRecordCount = $categories->count()
Step 2: Pass total count inside the with function
$categories->with([
'exams' => function($query) use($totalRecordCount){
$query->take(5*$totalRecordCount);
}
])
Step 3: Now you can retrieve the result as per requirement
$categories->get();
So recently I have been thinking and can't find a solution yet to this problem since my lack of development with doctrine2 and symfony query builder.
I have 2 tables:
Goals: id,user_id,target_value...
Savings: id,goal_id,amount
And I need to make a select from goals (all the informations in my table are from the goals table, except that I need to make a SUM(amount) from the savings table on each goal, so I can show the user how much did he saved for his goal)
This is the MySQL query:
select
admin_goals.created,
admin_goals.description,
admin_goals.goal_date,
admin_goals.value,
admin_goals.budget_categ,
sum(admin_savings.value)
from admin_goals
inner join admin_savings on admin_savings.goal_id=admin_goals.id
where admin_goals.user_id=1
group by admin_goals.id
It returns what I want but I have no idea how to implement it with doctrine or query builder, can you please show me an example in both ways?
I highly appreciate it !
I am going to assume you need this fields only and not your AdminGoals entity. On your AdminGoalsRepository you can do something like this:
public function getGoalsByUser(User $user)
{
$qb = $this->createQueryBuilder('goal');
$qb->select('SUM(savings.value) AS savings_value')
->addSelect('goal.created')
->addSelect('goal.description')
->addSelect('goal.goalDate')
->addSelect('goal.value')
->addSelect('goal.budgetCat') //is this an entity? it will be just an ID
->join('goal.adminSavings', 'savings', Join::WITH))
->where($qb->expr()->eq('goal.user', ':user'))
->groupBy('goal.id')
->setParameter('user', $user);
return $qb->getQuery()->getScalarResult();
}
Keep in mind that the return object will be an array of rows, each row is an associated array with keys like the mappings above.
Edit
After updating the question, I am going to change my suggested function but going to leave the above example if other people would like to see the difference.
First things first, since this is a unidirectional ManyToOne between AdminSavings and AdminGoals, the custom query should be in AdminSavingsRepository (not like above). Also, since you want an aggregated field this will "break" some of your data fetching. Try to stay as much OOP when you are not just rendering templates.
public function getSavingsByUser(User $user)
{
$qb = $this->createQueryBuilder('savings');
//now we can use the expr() function
$qb->select('SUM(savings.value) AS savings_value')
->addSelect('goal.created')
->addSelect('goal.description')
->addSelect('goal.goalDate')
->addSelect('goal.value')
->addSelect('goal.budgetCat') //this will be just an ID
->join('savings.goal', 'goal', Join::WITH))
->where($qb->expr()->eq('goal.user', ':user'))
->groupBy('goal.id')
->setParameter('user', $user);
return $qb->getQuery()->getScalarResult();
}
Bonus
public function FooAction($args)
{
$em = $this->getDoctrine()->getManager();
$user = $this->getUser();
//check if user is User etc depends on your config
...
$savings = $em->getRepository('AcmeBundle:AdminSavings')->getSavingsByUser($user);
foreach($savings as $row) {
$savings = $row['savings_value'];
$goalId = $row['id'];
$goalCreated = $row['created'];
[...]
}
[...]
}
If you use createQuery(), then you can do something like this:
$dqlStr = <<<"DSQL"
select
admin_goals.created,
admin_goals.description,
admin_goals.goal_date,
admin_goals.value,
admin_goals.budget_categ,
sum(admin_savings.value)
from admin_goals
inner join admin_savings on admin_savings.goal_id=admin_goals.id
where admin_goals.user_id=1
group by admin_goals.id
DSQL;
$em = $this->getDoctrine()->getManager();
$query = $em->createQuery($dqlStr);
$query->getResult();
On the other hand, if you would like to use createQueryBuilder(), you can check this link: http://inchoo.net/dev-talk/symfony2-dbal-querybuilder/
I have two table for post and user. I want to show post count of user in users list gridview. In yii 1 I use this in model to define a relation for this purpose:
'postCount' => array(self::STAT, 'Post', 'author',
'condition' => 'status = ' . Post::ACTIVE),
...
User:find...().with('postCount').....
But i don't know how to implement this in Yii2 to get count of post in User:find():with('...') to show in gridview.
Anyone try this in yii2?
Here is an example of what I did and it seems to work fine so far. It was used to get a count of comments on a post. I simply used a standard active record count and created the relation with the where statement using $this->id and the primary key of the entry its getting a count for.
public function getComment_count()
{
return Comment::find()->where(['post' => $this->id])->count();
}
Just a passing it along...
You can try the code below:
User::find()->joinWith('posts',true,'RIGHT JOIN')->where(['user.id'=>'posts.id'])->count();
Or if you want to specify a user count:
//user id 2 for example
User::find()->joinWith('posts',true,'RIGHT JOIN')->where(['user.id'=>'posts.id','user.id'=>2])->count();
Please note that, posts is a relation defined in your User model like below:
public function getPosts()
{
return $this->hasMany(Post::className(), ['user_id' => 'id']);
}
Well still I think for those who it may concern, if you JUST want the count a select and not the data it will be better use this instead imho:
$count = (new \yii\db\Query())
->select('count(*)')
->from('table')
->where(['condition'=>'value'])
->scalar();
echo $count;
I'm trying to include a new element on a array that is filled with a query result.
For example, I have an array called $event with $event['name'], $event['date'], $event['price'].
Now, I want to add $event['category']. This one is not declared on DB event table, but $event is an array of my code. It not depends of the DB event table, no?
So... how I can put $event['cateogory'] inside event in my Class code of CodeIgniter?
I tried to put it directly, and the error show that "category" index is not defined.
$events = $this->Event_model->get_all_events();
foreach ($events as $event) {
$event['category'] = $this->Category_model->get_category($event['idCategory']);
}
$data{
'events' => $events,
}
$this->load->view('events_list',$data);
Thank you all
Rather than trying to iterate over every result and adding the category (which you can do if you follow the comment made by Tularis), you should let SQL add the category by using SQL Joins.
In the Code Igniter Documentation on Active Records, you'll find information about joining Tables in Code Igniter.
Here's a simple example from the documentation adjustet to your needs:
$this->db->select('*');
$this->db->from('events');
$this->db->join('categories', 'categories.id = events.idCategory');
$query = $this->db->get();
// Produces:
// SELECT * FROM blogs
// JOIN comments ON comments.id = blogs.id
In my CodeIgniter project I'm getting the list of projects and successfully output them on a page. However, the data in one of the columns on that page should be retrieved from a different table in DB using the project ID. Could anybody help me to figure out how that can be done? Basically I need to make another query to that other table specifying the project id but don't actually know how to do that with CodeIgniter.
UPDATE
In the model I'm getting the list of projects with the following function:
function get_projects_list($page, $limit){
$sql = sprintf("SELECT * FROM Project WHERE deleted != 1 LIMIT %d, %d", ($page-1)*$limit, $limit);
$query = $this->db->query($sql);
return $query->result();
}
And in the controller I call the following function:
$projects_list = $this->Project_management_model->get_projects_list($curPage, self::$LIMIT_PER_PAGE);
$data['projects_list'] = $projects_list;
$data['cur_page'] = $curPage;
$data['page_count'] = $pageCount;
$this->load->view('project_management_view', $data);
And in the view I simply run on the $data with foreach and list the results in a table. In that table there's a column where I need to show a result from another table based on the ID of the project of that very row.
Thanks for helping.
You didn't mention whether you are using ActiveRecord or not. I am assuming that you are. I'll also guess that maybe what you need to do is use a JOIN.
If you were using straight SQL, you would do this using some SQL that might look something like this:
SELECT a.appointment_time, u.user_real_name FROM appointment a, site_user u WHERE u.site_user_id = a.user_id;
That would pull the user's name from the user table based on the user id in the appointment table and put it with the appointment time in the query results.
Using ActiveRecord, you would do something like this:
$this->db->select('appointment_time,user_real_name')->from('appointment')->join('site_user', 'site_user_id=appointment_user_id');
But why don't you tell us a little bit more about your question. Specifically, do you want this column in the other table to be related to the rows from the first table? If so, my JOIN suggestion is what you need.
I've actually found a way to do that with a custom helper. Creating a new helper and loading it in the controller gives an option to use the function from that helper in the view.
Thanks.
public function get data()
{
$this->db->flush_cache();
$query = $this->db->get('project_table');
$result = $query->result();
$data = array();
for ($i = 0;$i < count($result);$i++)
{
$data[$i] = $result[$i];
$data[$i]['project_data'] = temp($result[$i]->id);
}
return data;
}
private function temp($id = 0)
{
$this->db->flush_cache();
$this->where('id',$id);
$query = $this->db->get('project_table2');
$result = $query->result();
if (count($result) != 0)
return $result[0]->data;
}
you can do it by some thing like that,or you can use sub-query by query function of database.