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I am setting up crud operations for my go api. After creating all the functions, I get error "app.createApplication undefined (type Application has no field or method createApplication)", although I have created it.

• Made sure that variables do not have the same name as existing packages as other questions on stack overflow has stated.

api.go

package controllers



import (

"encoding/json"

"fmt"

"log"

"net/http"

"os"

"strconv"

"time"



"github.com/gorilla/mux"

"github.com/jinzhu/gorm"

_ "github.com/jinzhu/gorm/dialects/postgres"

_ "github.com/lib/pq"

_ "gitlab.torq.trans.apps.ge.com/503081542/k-auth-api/models"

)



var err error



type API struct {

Database *gorm.DB

Router   *mux.Router

}



func (api *API) Initialize(opts string) 

{

// Initialize DB



var driver = "postgres"

var host = os.Getenv("DB_HOST")

var dbname = os.Getenv("DB_NAME")

var user = os.Getenv("DB_USER")

var password = os.Getenv("DB_PASSWORD")

var port = os.Getenv("DB_PORT")

var conn = fmt.Sprintf("host=%v dbname=%v user=%v password=%v port=%v sslmode=disable", host, dbname, user, password, port)

api.Database, err = gorm.Open(driver, conn)



if err != nil {

    log.Print("failed to connect to the database")

    log.Fatal(err)

}



fmt.Println("Connection estabished")



// Application Model



type Application struct {

    ID        string `json:"id" gorm:"primary_key"`

    AccessId  int64

    CreatedAt time.Time `json:"-"`

    UpdatedAt time.Time `json:"-"`

    Name      string    `json:"name"`

    Ci        string    `json:"ci"`

}



if !api.Database.HasTable(&Application{}) {

    api.Database.CreateTable(&Application{})

}



// Initialize Router

api.Router = mux.NewRouter()

api.Router.HandleFunc("/api/v1/applications", api.handleApplications)

api.Router.HandleFunc("/api/v1/application/{id}", api.handleApplication)

api.Router.HandleFunc("/api/v1/applications", api.getApplications).Methods("GET")

http.Handle("/", api.Router)

}

func (api *API) getApplications(w http.ResponseWriter, r *http.Request) {

type Application struct {

    ID        string `json:"id" gorm:"primary_key"`

    AccessId  int64

    CreatedAt time.Time `json:"-"`

    UpdatedAt time.Time `json:"-"`

    Name      string    `json:"name"`

    Ci        string    `json:"ci"`

}

count, _ := strconv.Atoi(r.FormValue("count"))

start, _ := strconv.Atoi(r.FormValue("start"))



if count > 10 || count < 1 {

    count = 10

}

if start < 0 {

    start = 0

}



applications, err := getApplications(api.Database, start, count)

if err != nil {

    respondWithError(w, http.StatusInternalServerError, err.Error())

    return

}



respondWithJSON(w, http.StatusOK, applications)

}



func respondWithError(w http.ResponseWriter, code int, message string) {

respondWithJSON(w, code, map[string]string{"error": message})

}

func respondWithJSON(w http.ResponseWriter, code int, payload interface{}) {

response, _ := json.Marshal(payload)



w.Header().Set("Content-Type", "application/json")

w.WriteHeader(code)

w.Write(response)

}

main.go

package main



import (

    "log"

    "net/http"



    "github.com/gorilla/handlers"

    "gitlab.torq.trans.apps.ge.com/503081542/k-auth-api/controllers"

)



var err error



func main() {

    api := controllers.API{}

    api.Initialize("DB_HOST, DB_USER, DB_PASSWORD, DB_NAME, DB_PORT sslmode=disable connect_timeout=5")

    // api.Initialize("host=%s user=%s password=%s dbname=%s port=%s sslmode=disable connect_timeout=5")



    // Bind to a port and pass our router in

    log.Fatal(http.ListenAndServe(":8000", handlers.CORS()(api.Router)))



    if err != nil {

        panic(err.Error())

    }

}

if err := app.createApplication(api.Database); err != nil {

Your var app has Application type but method createApplication linked with API type. I cannot find createApplication method for Application in the code.

Making some progress. I added the following code as the “getApplication” method. No longer getting the previous error, now getting error listed below.

func (app *Application) getApplication(api.Database) {

    if err := app.getApplication(api.Database); err != nil {

    respondWithError("Error getting Application")

    return

}

Error:

• [go] Undefined: Application


• [go] Undefined: api