Mongoose

The mongoose data source allows importing collections from a mongoose instance.

To make everything work as expected, you need to install the package @forestadmin/datasource-mongoose.

agent.js

const { createAgent } = require('@forestadmin/agent');
const { createMongooseDataSource } = require('@forestadmin/datasource-mongoose');
const connection = require('./mongoose-models');

// Create agent and import collections from mongoose.connection
const agent = createAgent(options).addDataSource(
  createMongooseDataSource(connection, { flattenMode: 'none' }),
);

mongoose-models.js

Dealing with deeply nested models

One Mongoose collection split into four Forest-Admin collections

When passing flattenMode: 'none' to the mongoose data source, the connector will map each mongoose model to a single forest admin collection without transformations.

As models in mongoose can be deeply nested, that may not be what you want:

• Nested references will not be displayed as relations.

• JSON editors will be displayed for nested data.

Understanding flattenMode

	Description
flattenMode: 'auto'	Arrays of objects and arrays of references are converted to independent forest admin collections. All other fields are moved to the root of each collection
flattenMode: 'manual'	You are in full control on which virtual collections are created, and which fields are moved
flattenMode: 'none'	No transformation are made: forest admin collection use the exact same structure than your mongoose models
flattenMode: 'legacy'	Retro-compatibility with previous versions
not defined	Equivalent to legacy but a warning is displayed at server startup

Example

Supposing that persons records have the following format:

{
  "name": "Sherlock Holmes",
  "age": 54,
  "address": {
    "streetName": "Baker Street",
    "city": "London",
    "country": "Great Britain"
  },
  "bills": [
    {
      "title": "Rent",
      "amount": 0,
      "issueDate": "1887-04-17",
      "payedBy": ["Sherlock", "John", "Mrs Hudson"]
    }
  ]
}

The following samples are equivalent, and will import two collections into your forest admin panel:

• persons with the following fields: name, age, address->streetName, address->city, address->country.

• persons_bills with the following fields: title, amount, issueDate, payedBy.

// Automatic mode
const dataSource = createMongooseDataSource(mongoose.connection, { flattenMode: 'auto' });

// Manual mode
const dataSource = createMongooseDataSource(mongoose.connection, {
  flattenMode: 'manual',
  flattenOptions: {
    // name of the mongoose model
    persons: {
      // paths that should be converted to independent collections
      asModels: ['bills'],

      // paths that should be moved to the root of the collection
      asFields: ['address'],
      // or
      // asFields: ['address.streetName', 'address.city', 'address.country'],
      // or
      // asFields: [{ field: 'address', level: 1 }],
    },
  },
});