问题
I have a five tables in which i need to get data from all this.
post,product,categories,attributes,post_attribute
I have a query in my model that collect all post for a one product and it contains categories and attributes details . Query :
Post::with(['product.categories.attributes'])->whereStatus("Active")->get();
Response:
"PostDetails": [
{
"id": 153,
"user_id": 3,
"product_id": 1,
"demand_or_supply": "Demand",
"description": "This is a post description three",
"image_one": null,
"image_two": null,
"image_three": null,
"image_four": null,
"status": "Active",
"created_at": "2018-05-07 09:51:08",
"updated_at": "2018-05-07 09:51:08",
"product": {
"id": 1,
"title": "Diamond",
"icon": null,
"status": "Active",
"created_at": "2018-04-27 18:46:28",
"updated_at": "2018-04-27 18:46:28",
"categories": [
{
"id": 1,
"product_id": 1,
"title": "Shape",
"status": "Active",
"sort_order": 1,
"created_at": "2018-04-27 18:46:28",
"updated_at": "2018-04-27 18:46:28",
"attributes": [
{
"id": 1,
"product_id": 1,
"category_id": 1,
"parent_id": null,
"title": "Round",
"status": "Active",
"sort_order": 2,
"created_at": "2018-04-27 18:46:29",
"updated_at": "2018-04-27 18:46:29"
},
{
"id": 2,
"product_id": 1,
"category_id": 1,
"parent_id": null,
"title": "Princess",
"status": "Active",
"sort_order": 1,
"created_at": "2018-04-27 18:46:29",
"updated_at": "2018-04-27 18:46:29"
},
{
"id": 3,
"product_id": 1,
"category_id": 1,
"parent_id": null,
"title": "Oval",
"status": "Active",
"sort_order": 3,
"created_at": "2018-04-27 18:46:29",
"updated_at": "2018-04-27 18:46:29"
},
{
"id": 4,
"product_id": 1,
"category_id": 1,
"parent_id": null,
"title": "Kite",
"status": "Active",
"sort_order": 8,
"created_at": "2018-04-27 18:46:29",
"updated_at": "2018-04-27 18:46:29"
},
{
"id": 5,
"product_id": 1,
"category_id": 1,
"parent_id": null,
"title": "1-5",
"status": "Active",
"sort_order": 4,
"created_at": "2018-04-27 18:46:29",
"updated_at": "2018-04-27 18:46:29"
},
{
"id": 6,
"product_id": 1,
"category_id": 1,
"parent_id": null,
"title": "6-10",
"status": "Active",
"sort_order": 9,
"created_at": "2018-04-27 18:46:29",
"updated_at": "2018-04-27 18:46:29"
},
{
"id": 8,
"product_id": 1,
"category_id": 1,
"parent_id": null,
"title": "-2",
"status": "Active",
"sort_order": 10,
"created_at": "2018-04-27 18:46:29",
"updated_at": "2018-04-27 18:46:29"
},
{
"id": 9,
"product_id": 1,
"category_id": 1,
"parent_id": null,
"title": "+2 -4",
"status": "Active",
"sort_order": 7,
"created_at": "2018-04-27 18:46:29",
"updated_at": "2018-04-27 18:46:29"
},
{
"id": 10,
"product_id": 1,
"category_id": 1,
"parent_id": null,
"title": "+4 -6 1/2",
"status": "Active",
"sort_order": 6,
"created_at": "2018-04-27 18:46:29",
"updated_at": "2018-04-27 18:46:29"
}
]
},
There is another table called post_attributes in this table I store attribute_id and product_id which is belongs to attribute and product table.
I want to filter attributes data which is only available in post_attributes table and only for 'product' which is available on post_attributes table with product_id and attribute_id.
How can i do this ?
回答1:
To constraint eager loading relations you can pass a closure to the eager loading query, and to query a relation you can use whereHas function, so it would look something like this:
Post::with(['product.categories.attributes' => function($query) {
// Eager load constraint
$query->whereHas('post_attribute', function ($query) {
$query->where('product_id', 1); // Filter by the joined data
});
}])->whereStatus("Active")->get();
Hope this helps you.
来源：https://stackoverflow.com/questions/50215037/laravel-join-within-query-using-eloquent