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<p>我有一個(gè)用于作業(yè)的表，一個(gè)用于解決方案的表，還有一個(gè)用于學(xué)生的表。 我想檢索所有的作業(yè)，并且對(duì)于每個(gè)作業(yè)，我想添加一個(gè)“標(biāo)志”，顯示當(dāng)前登錄的學(xué)生是否嘗試過該作業(yè)。</p> <p>我嘗試了這個(gè)：</p> <pre class="brush:golang;toolbar:false;">import ( "fmt" "gorm.io/gorm" "encoding/json" "github.com/my_organisation/myorg-repo/db" ) var database *gorm.DB var solutions []db.Solution var listOfAsnmtIDs []uint func myfuncn (w http.ResponseWriter, r *http.Request){ //... _ = database.Table("solutions").Where("pupil_id = ?", pupil.ID).Select("assignment_id").Find(&solutions) for _, solution := range solutions { listOfAsnmtIDs = append(listOfAsnmtIDs, solution.AssignmentID) } response := database.Table("assignments").Select(`id, created_at, IIF((id IN ?), 'attempted', 'Not attempted') as attempted`, listOfAsnmtIDs).Find(&allAssignments) if response.RowsAffected < 1 { respondToClient(w, 404, nil, "No assignments found") return } //... } </pre></p>

    var mad string
    for i, solution := range solutions {
        mad += strconv.FormatUint(uint64(solution.AssignmentID), 10)
        if i != len(solutions) {
            mad += ","
        }
        listOfAsnmtIDs = append(listOfAsnmtIDs, solution.AssignmentID)
    }

    response := database.Table("assignments").Select(`id, created_at, IIF((id IN ?), 'attempted', 'Not attempted') as attempted`, mad).Find(&allAssignments)