`Cannot recompile the `Product` model as it has already been compiled. Please try again

I attempted to reference my productSchema within my purchaseSchema but encountered the following error: OverwriteModelError: Cannot overwrite Product model once compiled. What steps can I take to resolve this issue?

Here is my product schema:

mongoose = require('mongoose');
var Schema = mongoose.Schema;

var productSchema = new Schema({

cd: {
    type: Number,
    require: true
},

nm_iten: {
    type: String,
    require: true
},

type_iten: {
    type: String,
    require: true
},

unity: {
    type: String,
    require: true
},

});
var product = mongoose.model('Product',productSchema);
module.exports = {product:product}

And, here is my purchase schema:

   var mongoose = require('mongoose');
   var Schema = mongoose.Schema;
   var productSchema = require('./products');
   var product = productSchema.product;

   var purchaseSchema = new Schema({

     code: {
       type: Number,
       require: true
    },

     product:[product],

     quant: {
       type: Number,
       require: true
    },

    vl_uni: {
       type: Number,
       require: true
     },

     vl_total: {
        type: Number,
        require: true
    }


    });
    mongoose.model('Purchase',purchaseSchema);
javascriptnode.jsmongodbexpressmongoose

Answer №1

When creating a purchase schema, it is important to ensure that the product field points to the productSchema and not directly to the product model.

Below is an example of the Product schema:

const mongoose = require('mongoose');
const Schema = mongoose.Schema;

const productSchema = new Schema({
    cd: {
        type: Number,
        required: true
    },    
    nm_iten: {
        type: String,
        required: true
    },       
    type_iten: {
        type: String,
        required: true
    },        
    unity: {
        type: String,
        required: true
    },   
});
module.exports = productSchema;

And here is how you can define the Purchase schema:

const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const productSchema = require('./products');
const product = productSchema;

const purchaseSchema = new Schema({
   code: {
       type: Number,
       required: true
   },
   product:[product],
   quant: {
       type: Number,
       required: true
   },
   vl_uni: {
       type: Number,
       required: true
   },
   vl_total: {
       type: Number,
       required: true
   }
});
mongoose.model('Purchase',purchaseSchema);

If you need more information on embedded documents in MongoDB, check out the documentation at: http://mongoosejs.com/docs/2.7.x/docs/embedded-documents.html

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