Two models are returned as Zend_Db_Select objects.
Then, I need to join them and fetch data together at once.
class Model_User extends Abstract_Model {
public function sqlUser() {
return $this->select(array(
'user_id', 'user.name', 'user.login', 'address.street', 'city.city_id', 'city.city_name','region.region_id', 'region.region_name'
))
->joinUsing('address','address_id','') ->join('city', 'city.city_id = address.city_id', '')
->join('region', 'region.region_id = city.region_id', '');
}
}
class Model_Technics extends Abstract_Model{
public function sqlList() {
return $this->select()
// here some more sql
->joinUsing('catalog_model','model_id','');
}
}
Then I need some where else fetch sqlList with all info for every user. I dont whant to duplicate all code, I just want to join sql from User model through join
You could iterate through the "sections" of zend_db_select (columns,from,joins,where) and figure a way to append them to the other query, but I wouldn't suggest it.
An alternative might be to have a "join" method on the model you're joining to, which will take your select object and run the join method(s) on it. It would, of course, depend on the table(s) already available in the select object already. Or that method might just pass back a structure defining how to join to the join-model's table, which your primary model can decide what to do with it.
There are a ton of solutions, but there's no really easy way to just jam two zend_db_select objects together without some extra logic between them. The main missing piece would be relationship information between the two models.
I know this isn't a full blown answer (as I can't comment yet), but hopefully it will point you to a path that sounds usable.
Related
I'm currently struggling with retrieving data towards a parent model. I'll drop my database, classes, and things I've tried before.
I have 4 tables: sales_orders, products, work_orders, and product_sales_order (pivot table between sales_orders and products).
SalesOrder.php
class SalesOrder extends Model
{
public function products()
{
return $this->belongsToMany(Product::class)
->using(ProductSalesOrder::class)
->withPivot(['qty', 'price']);
}
}
ProductSalesOrder.php
class ProductSalesOrder extends Pivot
{
public function work_orders()
{
return $this->hasMany(WorkOrder::class);
}
public function getSubTotalAttribute()
{
return $this->qty* $this->price;
}
}
WorkOrder.php
class WorkOrder extends Model
{
public function product_sales_order()
{
return $this->belongsTo(ProductSalesOrder::class);
}
public function sales_order()
{
return $this->hasManyThrough(
ProductSalesOrder::class,
SalesOrder::class
);
}
}
So, what I want to retrieve sales order data from work order since both tables don't have direct relationship and have to go through pivot table and that is product sales order. I've tried hasOneThrough and hasManyThrough but it cast an error unknown column. I understand that error and not possible to use that eloquent function.
Is it possible to retrieve that sales order data using eloquent function from WorkOrder.php ?
You cannot achieve what you want using hasOneThrough as it goes from a table that has no ID related to the intermediate model.
In your example you are doing "the inverse" of hasOneThrough, as you are going from a model that has the ID of the intermediate model in itself, and the intermediate model has the ID of your final model. The documentation shows clearly that hasOneThrough is used exactly for the inverse.
So you still should be able to fix this, and use a normal relation as you have the sales_orders_id in your model SuratPerintahKerja, so you can use a normal relation like belongsTo to get just one SalesOrder and define it like this:
public function salesOrder()
{
return $this->belongsTo(SalesOrder::class, 'sale_orders_id');
}
If you want to get many SalesOrders (if that makes sense for your logic), then you should just run a simple query like:
public function salesOrders()
{
return $this->query()
->where('sale_orders_id', $this->sale_orders_id)
->get();
}
Have in mind that:
I have renamed your method from sales_order to salesOrder (follow camel case as that is the Laravel standard...).
I have renamed your method from sales_order to salesOrders for the second code as it will return more than 1, hence a collection, but the first one just works with one model at a time.
I see you use sale_orders_id, but it should be sales_order_id, have that in mind, because any relation will try to use sales_order_id instead of sale_orders_id, again, stick to the standards... (this is why the first code needs more parameters instead of just the model).
All pivot tables would still need to have id as primary and auto incremental, instead of having the id of each related model as primary... Because in SuratPerintahKerja you want to reference the pivot table ProdukSalesOrder but it has to use both produks_id (should have been produk_id singular) and sale_orders_id (should have been sales_order_id). So if you were able to use something like produk_sales_order_id, you could be able to have better references for relations.
You can see that I am using $this->query(), I am just doing this to only return a new query and not use anything it has as filters on itself. I you still want to use current filters (like where and stuff), remove ->query() and directly use the first where. If you also want to add ->where('produks_id', $this->produks_id) that is valid and doesn't matter the order. But if you do so, I am not sure if you would get just one result, so ->get() makes no sense, it should be ->first() and also the method's name should be salesOrder.
Sorry for this 6 tip/step, but super personal recommendation, always write code in English and do not write both languages at the same time like produks and sales orders, stick to one language, preferrably English as everyone will understand it out of the box. I had to translate some things so I can understand what is the purpose of each table.
If you have any questions or some of my code does not work, please tell me in the comments of this answer so I can help you work it out.
Edit:
After you have followed my steps and changed everything to English and modified the database, this is my new code:
First, edit ProductSalesOrder and add this method:
public function sales_order()
{
return $this->belongsTo(SalesOrder::class);
}
This will allow us to use relations of relations.
Then, have WorkOrder as my code:
public function sales_order()
{
return $this->query()->with('product_sales_order.sales_order')->first();
}
first should get you a ProductSalesOrder, but then you can access ->sales_order and that will be a model.
Remember that if any of this does not work, change all the names to camelCase instead of kebab_case.
I'm having some trouble doing eloquent database queries in Laravel. I have searched around a lot, but I don't know exactly what to search for to get my answer.
I'm making a web page in Laravel for kindergardens, and I need to get all children connected to a kindergarden in a single collection/array. The problem is that children are only connected to the kindergarden through their group(s). So the query needs to be able to get all children that are part of any group connected to the kindergarden.
The model relationships are like this:
A kindergarden has many groups, and groups belong to a kindergarden.
A group has many children, and children have many groups.
The best I've managed to do so far is this:
public function getChildren(){
$kid = Session::get('kid');
$k = Kindergarden::find($kid);
$groups = $k->group;
$children;
foreach($groups as $g){
$children = $children->merge($g->children);
}
$children = $children->toArray();
return Response::json($children);
}
But this makes duplicates when children are in several groups in the same kindergarden. It also seems like an unnecessary complicated way to do it.
For a while I also tried to get the hasManyThrough-relationship to work, but it doesn't seem to work when there'a a many-to-many relationship and a pivot table involved.
I tried with this:
class Kindergarden extends Eloquent {
public function children()
{
return $this->hasManyThrough('Children', 'Group', 'kid', 'gid');
}
}
and then tried to call
Kindergarden::find(1)->children;
I'm sure there is a really simple way to do this, but I'm totally new to laravel and not really that great at sql, so I haven't been able to find anything to help me figure this out.
Edit:
Managed to find a way to do it using Fluent:
$children = DB::table('children')
->join('children_group', 'children.chiid', '=', 'children_group.chiid')
->join('group', 'group.gid', '=', 'children_group.gid')
->where('group.kid', '=', $kid)
->groupby('children.chiid')
->get();
Still want to be able to do it using Eloquent, though.
In your Kindergarden class:
public function groups()
{
$this->hasMany('Groups', 'group_id', 'id');
}
In your Group class:
public function children()
{
$this->hasMany('Children', 'child_id', 'id')
}
Then try:
$children = Kindergarden::with('groups.children')->get();
This way you could go through each group in Kindergarden, and display each child that is apart of each group.
Also just a suggestion: In your database tables, I would name your related id's (such as a group ID in your Kindergarden table) group_id, instead of gid. Makes it much more readable and you know exactly what it's related to. Same with your child id, name it 'child_id' instead of 'chiid'.
EDIT: Since I don't know your table structure, take the functions above with a grain of salt. I hope what I suggested gets you on the right path! Let me know if it helps
This may be a dupe but I've been trawling for some time looking for a proper answer to this and haven't found one yet.
So essentially all I want to do is join two tables and attach a where condition to the entire collection based on a field from the joined table.
So lets say I have two tables:
users:
-id
-name
-email
-password
-etc
user_addresses:
-address_line1
-address_line2
-town
-city
-etc
For the sake of argument (realising this may not be the best example) - lets assume a user can have multiple address entries. Now, laravel/eloquent gives us a nice way of wrapping up conditions on a collection in the form of scopes, so we'll use one of them to define the filter.
So, if I want to get all the users with an address in smallville, I may create a scope and relationships as follows:
Users.php (model)
class users extends Eloquent{
public function addresses(){
return $this->belongsToMany('Address');
}
public function scopeSmallvilleResidents($query){
return $query->join('user_addresses', function($join) {
$join->on('user.id', '=', 'user_addresses.user_id');
})->where('user_addresses.town', '=', 'Smallville');
}
}
This works but its a bit ugly and it messes up my eloquent objects, since I no longer have a nice dynamic attribute containing users addresses, everything is just crammed into the user object.
I have tried various other things to get this to work, for example using a closure on the relationship looked promising:
//this just filters at the point of attaching the relationship so will display all users but only pull in the address where it matches
User::with(array('Addresses' => function($query){
$query->where('town', '=', 'Smallville');
}));
//This doesnt work at all
User::with('Addresses')->where('user_addresses.town', '=', 'Smallville');
So is there an 'Eloquent' way of applying where clauses to relationships in a way that filters the main collection and keeps my eloquent objects in tact? Or have I like so many others been spoiled by the elegant syntax of Eloquent to the point where I'm asking too much?
Note: I am aware that you can usually get round this by defining relationships in the other direction (e.g. accessing the address table first) but this is not always ideal and not what i am asking.
Thanks in advance for any help.
At this point, there is no means by which you can filter primary model based on a constraint in the related models.
That means, you can't get only Users who have user_address.town = 'Smallwille' in one swipe.
Personally I hope that this will get implemented soon because I can see a lot of people asking for it (including myself here).
The current workaround is messy, but it works:
$products = array();
$categories = Category::where('type', 'fruit')->get();
foreach($categories as $category)
{
$products = array_merge($products, $category->products);
}
return $products;
As stated in the question there is a way to filter the adresses first and then use eager loading to load the related users object. As so:
$addressFilter = Addresses::with('Users')->where('town', $keyword)->first();
$users= $addressFilter->users;
of course bind with belongsTo in the model.
///* And in case anyone reading wants to also use pre-filtered Users data you can pass a closure to the 'with'
$usersFilter = Addresses::with(array('Users' => function($query) use ($keyword){
$query->where('somefield', $keyword);
}))->where('town', $keyword)->first();
$myUsers = $usersFilter->users;
OK lets say I want to select a number of columns from a database table, but I won't know what those columns are in the method. I could pass them in, but it could be more or less depending on the method calling the database method.
A quick fix would be SELECT *, but I understand that this is bad and can cause more data to be returned than is necessary, and I definitely don't need all the data from that table.
So I am using CodeIgniter and prepared statements to do this, and below is what I have currently (it works, just point that out).
function get_pages() {
$this->db->select('pages.id, pages.title, pages.on_nav, pages.date_added, admin.first_name, admin.last_name')
->from('pages, admin')
->where('pages.admin_id = admin.id')
->order_by('pages.id', 'ASC');
$query = $this->db->get();
return $query->result();
}
It's a simple function, but at the moment limited to getting only 'pages'. I want to convert this to work with getting from other tables too. What is the best way?
Many thanks in advance.
EDIT In CodeIgniter I have many Controllers. One for 'pages', one for 'products', one for 'news' and on and on. I don't want to create a single database query method in my model for each controller.
i think the desire to not have 4 methods is misguided. if you don't have the information in the method, you'll have to pass it in. so you could either pass in a string with the table you want and switch over that changing the query based on the table name, or pass in all of the necessary parts of the query. this would include table name, criteria column, criteria, and columns to select. and you'd need to pass that information in every time you called the function. neither of those two methods are really going to save you much code, and they're both less readable than a function for each purpose.
The entire idea with models to put your specific queries to the persistence layer in there. Using a generic catch-all method can be disastrous and hard to test. You should shape your model around the problem you're trying to solve.
This makes it much cleaner and easier to work with. At the same time you must also avoid the common trap of over-sizing models. Each model should follow the SRP. Try and separate concerns so that in your controller, you can easily see state changes.
Does that make sense or am I just rambling...?
In your model:
function get_pages($table_source) {
$this->db->select($table_source.".id"); // or $this->db->select('id');
// for instance, if one of your $table_source ="users" and there is no 'title' column you can write
if($table_source!='users') $this->db->select('title');
$this->db->select('on_nav');
$this->db->select('date_added');
$this->db->select('admin.first_name');
$this->db->select('admin.last_name');
$this->db->join('admin','admin.id = '.$table_source.'.admin_id')
$this->db->order_by('pages.id', 'ASC');
$query = $this->db->get($table_source);
return $query->result_array();
}
In your controller:
function all_tables_info() {
$tables = array("pages","users","customers");
$i=0;
foreach($tables as $table) {
$data[$i++]=$this->your_Model->get_pages($table);
}
//do somthing with $data
}
Here is situation.... ...
I have a DBManager, which is implement a DBInterface, in the DBInterface, I got 4 method:
-create(DBCmd);
-read(DBCmd);
-update(DBCmd);
-delete(DBCmd);
The DBCmd object is responsible for generate the SQL statement, and the DBCmd requires an object in sql statement:
class DBCmd{
public _constructor($aObj){
}
public executeCreate(){
}
public executeRead(){
}
public executeUpdate(){
}
public executeDelete(){
}
}
The flow will be like this:
aObject ---> put it into DBCmd ----> put the DBCmd in DBManager ---> execute
But the problems happen when I get some objects related to other tables, for example...a customer have a purchase record, and which purchase record have many items....
So, what do I do in my read method? should I read all the records related to the customer?? Do I need to loop all the items inside the purchase record too?
If yes, when I doing read customer, I need to query 3 tables, but some that may not need to see.....it waste the resource...
And I come up with another solution, I make a new set of DBCmd, that allow me to get the related DB items, for example:
class getReleatedPurchaseRecordDBCmd{
public _constructor($aCustomerObject){
}
//.... ....
}
But in this "solution", I got some problems, is I loss the relationship in the object customer...yes, I can read back all the records, get the customer object basically don't know any things about the purchase record....
Some may ask me to do something like this:
class customer{
//skip other methods...
public getPurchaseRecords(){
//query the db
}
}
It works, but I don't want the object structure have some strong relationship between the db....That's why I come up with the DBCmd stuff...
So, everything seems to be very coupling, how can solve it? Thank you.
for stuff like this i tend to get the count of sub objects with the initial query usually involving sql COUNT and JOIN, then have a seperate getSubObjects command that can be called if needed later. So for example:
$datamodel->getCustomer($id);//or some such method
returns
class Customer{
$id = 4;
$recordCount = 5;
$records = null;
}
I can then use the count for any display stuff as needed, and if i need the records populated call:
$customer->records = $datamodel->getCustomerRecords($customer->id);