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I'm trying to make one-to-many relationship database with Mongoose and GraphQL.

Whenever i insert the data to graphql mutation argument, i will get [Object: null prototype] error

I notice the object will have [Object: null prototype] in front of it when i tried to console.log for debug purpose.

I have tried many ways, tried to map() args or even to use replace() but no luck. All i have been getting is "args.ingredient.map/replace is not a function"

I have test hard coded method by changing the args for example

args.category = '5c28c79af62fad2514ccc788'

args.ingredient = '5c28c8deb99a9d263462a086'

Surprisingly it works with this method
I assume the input cannot be an object but just an ID.

Refer below for actual results.

Resolvers

Query: {

    recipes: async (root, args, { req }, info) => {

        return Recipe.find({}).populate('ingredient category', 'name createdAt').exec().then(docs => docs.map(x => x))

    },

},

Mutation: {

    addRecipe: async (root, args, { req }, info) => {

      // args.category = '5c28c79af62fad2514ccc788'

      // args.ingredient = '5c28c8deb99a9d263462a086'

      // console.log(args.map(x => x))

      return Recipe.create(args)

    }

}

TypeDef

extend type Mutation {

    addRecipe(name: String!, direction: [String!]!, ingredient: [IngredientInput], category: [CategoryInput]): Recipe

}



type Recipe {

    id: ID!

    name: String!

    direction: [String!]!

    ingredient: [Ingredient!]!

    category: [Category!]!

}



input IngredientInput {

    id: ID!

}



input CategoryInput {

    id: ID!

}

Models

const recipeSchema = new mongoose.Schema({

    name: String,

    direction: [String],

    ingredient: [{ type: mongoose.Schema.Types.ObjectId, ref: 'Ingredient' }],

    category: { type: mongoose.Schema.Types.ObjectId, ref: 'Category' }

}, {

    timestamps: true // createdAt, updateAt

})



const Recipe = mongoose.model('Recipe', recipeSchema)

This is the result i console log the args when inserting the data

{ 

    name: 'Butter Milk Chicken TEST2',

    direction: [ 'Step1', 'Step2', 'Step3' ],

    ingredient:[[Object: null prototype] { id: '5c28c8d6b99a9d263462a085' }],

    category: [[Object: null prototype] { id: '5c28c79af62fad2514ccc788' }]

}

I assume i need to get something like this

{ 

    name: 'Butter Milk Chicken TEST2',

    direction: [ 'Step1', 'Step2', 'Step3' ],

    args.category = ['5c28c79af62fad2514ccc788']

    args.ingredient = ['5c28c8ccb99a9d263462a083', '5c28c8d3b99a9d263462a084', '5c28c8d6b99a9d263462a085']

}