Hi, there I'm fairly new to laravel-lighthouse. I've read the documentation but unfortunately, there is no detail about this issue. My question is How can I query more than one pivot table. I have an Item table that belongs to many other Models. The code is given below.
class Item extends Model
{
public function provisions(): BelongsToMany
{
return $this->belongsToMany(Pwmp::class,
'project_wise_material_provision_items', 'item_id', 'provision_id')
->withPivot('qty', 'unit_cost')
->withTimestamps()
->as('provision_items');
}
public function procurements(): BelongsToMany
{
return $this->belongsToMany(Pwpp::class,
'project_wise_procurement_plan_items', 'item', 'procurement')
->withTimestamps()
->as('procurement_items')
->withPivot('qty', 'unit_cost');
}
public function log_sheets(): BelongsToMany
{
return $this->belongsToMany(Braols::class,
'bid_receiving_and_opening_log_sheet_items', 'item', 'braols')
->withTimestamps()
->as('log_sheet_items')
->withPivot('qty', 'unit_cost', 'tax');
}
public function workshop(): BelongsToMany
{
return $this->belongsToMany(TransformerWorkshop::class,
'transformer_workshop_items', 'item', 'workshop')
->as('workshop_items')
->withTimestamps()
->withPivot('qty', 'flow', 'type');
}
public function sub_office(): BelongsToMany
{
return $this->belongsToMany(MaterialReceiptInSubOffice::class,
'material_receipt_in_sub_office_items', 'item', 'receipt')
->as('sub_office')
->withTimestamps()
->withPivot('id','qty', 'type');
}
type Item{
id: ID!
workshop_items: [TransformerWorkShopItemsPivot]
provision_items: [ProjectWiseMaterialProvisionItem]
sub_office: MaterialReceiptInSubOfficeItemsPivot
}
type MaterialReceiptInSubOfficeItemsPivot{
qty: Int
type: Int
id: ID
}
type ProjectWiseMaterialProvisionItem {
qty: String
unit_cost: String
}
type TransformerWorkShopItemsPivot{
qty: Int
type: Int
flow: Int
}
{ "data": { "material_receipt_in_sub_office_store": { "id": "4", "items": [ { "id": "431", "name": "Drill Machine", "image": "crane2.jpg", "category_id": { "id": "993" }, "provision_items": null, "sub_office": { "type": null, "id": null, "qty": null, "__typename": "MaterialReceiptInSubOfficeItemsPivot" } },
First, it looks like you don't use Laravel model's relationships into your type definition.
By specifying a @belongsToMany / @hasMany directive ( see more here ) you'll be able to optimize your queries.
type Item{
id: ID!
workshop_items: [TransformerWorkShopItemsPivot] @hasMany(relation: "workshop")
provision_items: [ProjectWiseMaterialProvisionItem] @hasMany(relation: "provisions")
sub_office: MaterialReceiptInSubOfficeItemsPivot @hasMany
}
I'm just not sure about the fact you give table aliases in your relation definition..
Then, by doing the query, you can fetch as much pivot relations as you want. Never got relation problems by doing this.
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