Cannot read properties of undefined (reading `fieldname`) GraphQL - node.js

Question

i am working on a project based on GraphQL API with nodejs And mongoose
so i have this Model Below :
const mongoose = require('mongoose')
const BreakingNewsSchema = new mongoose.Schema({
MainInfo:{
content:{type:String,required:true},
ParentCategory:{
type: mongoose.Schema.Types.ObjectId,
ref: 'ArticleCategory',
required: true
},
category:{
type: mongoose.Schema.Types.ObjectId,
ref: 'ArticleCategory',
required: true
},
},
options:{
clickable:{type:Boolean,required:true},
link:{type:String,required:false},
isActive:{type:Boolean,required:true,default:true}
},
infos:{
createdAt: { type: String, required: true},
updateDate: {type: String, required: false},
createdBy: {
type: mongoose.Schema.Types.ObjectId,
ref: "User",
required: true
},
updatedBy: {
type: mongoose.Schema.Types.ObjectId,
ref: "User",
required: false,
}}} ,{
timestamps: true})
module.exports = mongoose.model("BreakingNews", BreakingNewsSchema)
and i have this GraphQL Schema here :
const BreakingType = new GraphQLObjectType({
name: "BreakingNews",
fields: () => ({
id: {
type: GraphQLID
},
MainInfo: {
type: new GraphQLObjectType({
name: "BreakingMainInfo",
fields: () => ({
content: {
type: GraphQLString
},
ParentCategory: {
type: CategoryType,
resolve(parent, args) {
return Category.findById(parent.MainInfo.parentCategory)
}
},
category: {
type: CategoryType,
resolve(parent, args) {
return Category.findById(parent.MainInfo.category)
}
}
})
})
},
options: {
type: new GraphQLObjectType({
name: "BreakingOptions",
fields: () => ({
clickable: {
type: GraphQLBoolean
},
link: {
type: GraphQLString
},
isActive: {
type: GraphQLBoolean
}
})
})
},
})})
For the breakingNews Collection in Mongodb
and below i have the Category Collection ... so here is the Category Model :
const CategorySchema = new mongoose.Schema({
MainInfo:{
title: {
type: String,
required: true,
unique: true
},
slug: {
type: String,
required: false,
unique: true
},
},
seo:{
metaDescription: { type: String, required: false },
metaKeywords: [{
type: String,
required: false
}]
},
options:{
isParent:{type:Boolean,required:true},
isEnded:{type:Boolean,required:true},
parentCategory: {
type: mongoose.Schema.Types.ObjectId,
ref: "ArticleCategory",
required: false,
set: v => v === '' ? null : v
}
},
info:{
createdBy: {
type: mongoose.Schema.Types.ObjectId,
ref: "User",
required: true
},
updatedBy: {
type: mongoose.Schema.Types.ObjectId,
ref: "User",
required: false
},
articleCount:{type:Number,required:false},
oldId: { type: String, required: false }
}}, {
timestamps: true})
module.exports = mongoose.model("ArticleCategory", CategorySchema)
And finally i have the ArticleCategory Schema for GraphQL :
const CategoryType = new GraphQLObjectType({
name: "ArticleCategory",
fields: () => ({
id: {
type: GraphQLID
},
MainInfo: {
type: new GraphQLObjectType({
name: "ArticleCategoryMainInfo",
fields: () => ({
title: {
type: GraphQLString
},
slug: {
type: GraphQLString
}
})
})
},
seo: {
type: new GraphQLObjectType({
name: "ArticleCategorySeo",
fields: () => ({
metaDescription: {
type: GraphQLString
},
metaKeywords: {
type: new GraphQLList(GraphQLString)
}
})
})
},
options: {
type: new GraphQLObjectType({
name: "ArticleCategoryOptions",
fields: () => ({
isParent: {
type: GraphQLBoolean
},
isEnded: {
type: GraphQLBoolean
},
parentCategory: {
type: CategoryType,
resolve(parent, args) {
return Category.findById(parent.options.parentCategory)
}
}
})
})
}
})})
The problem is when i try to execute this query on graphQL:
query{
ActiveBreakingNews{
id
MainInfo{
content
ParentCategory {
id
}
category{
id
}
}
}
}
I get this error Cannot read properties of undefined (reading 'category') or Cannot read properties of undefined (reading 'category')
i find out its a problem find resolve function in the schema ... but i don't know what the wrong and what should i do to fix it ... please Help and thanks in advance