Unprocessable entity error

[Aakash_Raj]

I have created a post Api in go giber to to create a prompt. From the frontend I am passing the payload creator which has a string type but in my prompt_model i have it as prmitive.ObjectId type.
when I am running the function c.BodyParser(&prompt) it throws the error bad request Unprocessable Entity.

Here is the Prompt model:

type Prompts struct{
	Id primitive.ObjectID `json:"id,omitempty" bson:"_id,omitempty"`
	Creator primitive.ObjectID `json:"creator,omitempty" bson:"creator,omitempty"`
	CreatorUser User `json:"creatorUser,omitempty" bson:"-"`
	Prompt string `json:"prompt,omitempty" validate:"required"`
	Tag string `json:"tag,omitempty" validate:"required"`
}

here is the code for create-prompt controller:

func CreatePrompt(c *fiber.Ctx) error {
	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer cancel()

	var prompt models.Prompts

	// Extract session ID from the URL parameter
	// sessionID := c.FormValue("creator")
	// sessionObjectID, _ := primitive.ObjectIDFromHex(sessionID)
	// fmt.Printf("ss %v \n ",sessionID)

	// Validate the request body
	fmt.Println("dd", c.BodyParser(&prompt))
	if err := c.BodyParser(&prompt); err != nil {
		return c.Status(http.StatusBadRequest).JSON(responses.UserResponse{
			Status:  http.StatusBadRequest,
			Message: "error",
			Data:    &fiber.Map{"data": err.Error()},
		})
	}

	// Assuming the session ID is stored in the Creator field
	newPrompt := models.Prompts{
		Id:          primitive.NewObjectID(),
		Creator:     prompt.Creator,
		Prompt:      prompt.Prompt,
		Tag:         prompt.Tag,
	}

	result, err := promptCollection.InsertOne(ctx, newPrompt)
	if err != nil {
		return c.Status(http.StatusInternalServerError).JSON(responses.UserResponse{
			Status:  http.StatusInternalServerError,
			Message: "error",
			Data:    &fiber.Map{"data": err.Error()},
		})
	}

	return c.Status(http.StatusCreated).JSON(responses.UserResponse{
		Status:  http.StatusCreated,
		Message: "success",
		Data:    &fiber.Map{"data": result},
	})
}

here is the api call from frontend:

const response = await fetch("http://localhost:8000/create-prompt", {
        method: "POST",
        body: JSON.stringify({
          creator: session?.user.id,
          prompt: post.prompt,
          tag: post.tag,
        }),

here is the log for the payload data:

{
  "creator":"64ea57ad19b714af26ef3756",
  "prompt":"ads",
   "tag":"as"
}

I tried to convert the creator from string type to objectId type before using the bodyParser method but it was in vein
what I am doing wrong exactly?

[lemarkar (Leo Emar-Kar)]

I tried to reproduce the problem and here what I have found.

1. Please, check the code and confirm that I used the correct packages and didn’t break the logic:

package main

import (
	"fmt"

	fiber "github.com/gofiber/fiber/v2"
	"go.mongodb.org/mongo-driver/bson/primitive"
)

type Prompts struct {
	Id      primitive.ObjectID `json:"id,omitempty" bson:"_id,omitempty"`
	Creator primitive.ObjectID `json:"creator,omitempty" bson:"creator,omitempty"`
	Prompt  string             `json:"prompt,omitempty" validate:"required"`
	Tag     string             `json:"tag,omitempty" validate:"required"`
}

func CreatePrompt(c *fiber.Ctx) error {
	var prompt Prompts

	// Validate the request body
	fmt.Println("dd", c.BodyParser(&prompt))
	if err := c.BodyParser(&prompt); err != nil {
		return err
	}

	// Assuming the session ID is stored in the Creator field
	newPrompt := Prompts{
		Id:      primitive.NewObjectID(),
		Creator: prompt.Creator,
		Prompt:  prompt.Prompt,
		Tag:     prompt.Tag,
	}

	fmt.Printf("%#v\n", newPrompt)

	return nil
}

func main() {
	f := fiber.New()

	f.Post("/test", CreatePrompt)

	f.Listen(":8080")
}

2. If everything is okay. I ran this application and tried to use Postman to send a Post request with body:

And the response was the same error, you got Unprocessable Entity.

3. After the debug of the c.BodyParser func I found the possible problem: the type of the body “text/plain” is actually not supported by the parser. But as soon as I changed the body type within my Postman request to “application/json”, it worked as intended without an error. My guess is to add contentType: 'application/json', to your frontend call to specify it explicitly.

[Aakash_Raj]

Thanks it did work fine, you are life saver

[Aakash_Raj]

Hi it worked but I still have a slight problem

in this as you can see I want the creator field to be populated by the user Id from the user collection to refernce the user object like in the first part but I am not getting the creator field as you can see in the second document

[lemarkar (Leo Emar-Kar)]

Can you share the code you use for this?