GORM is a popular Go language ORM library used to simplify database operations. When using GORM for one-to-one linking, we can achieve this by defining the relationship between structures. First, we need to add a foreign key field to the structure, and then use GORM's `BelongsTo` method to associate the two structures. Next, we can use the `Preload` method to preload the related data at query time so that it can be fetched together when needed. In this way, we can easily implement one-to-one links and conveniently operate related data.
Question content
I am trying to load queue items from the database. I've created an API endpoint but am unable to get the data for the queue items to be preloaded. Instead, the entire "data" object is filled with null values.
Handler:
func QueueItemHandler(w http.ResponseWriter, r *http.Request) { var queueItems QueueItem var builder = database.Model(QueueItem{}) var queryError = builder. Preload("Status"). Preload("Data"). Find(&queueItems). Error w.Header().Set("Content-Type", "application/json") json.NewEncoder(w).Encode(queueItems) }
Here's how my gorm model is set up:
type QueueItemStatus struct { ID int64 `json:"id" gorm:"primary_key"` Name string `json:"name"` Description string `json:"description"` } type QueueItemData struct { ID int64 `json:"id" gorm:"primary_key"` QueueItemId int64 `json:"queue_item_id"` ScreenshotUrl string `json:"screenshot_url"` } type QueueItem struct { ID int64 `json:"id" gorm:"primary_key"` SourceUrl string `json:"source_url"` OriginId int64 `json:"origin_id"` StatusId int64 `json:"status_id"` Status QueueItemStatus `json:"status"` Data QueueItemData `json:"data" gorm:"foreignKey:id,references:queue_item_id"` CreatedAt time.Time `json:"created_at"` }
I'm thinking maybe I set up the model to point to the wrong column (if any)?
Solution
Try to change this
Data QueueItemData `json:"data" gorm:"foreignKey:QueueItemId;references:ID"`
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