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MongoDbGenericRepository

An example of generic repository implementation using the MongoDB C# Sharp 2.0 driver (async)

Now available as a nuget package: https://www.nuget.org/packages/MongoDbGenericRepository/

Covered by 400+ integration tests and counting.

The MongoDbGenericRepository is also used in AspNetCore.Identity.MongoDbCore.

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Worth Knowing

This package sets the MongoDefaults.GuidRepresentation to MongoDB.Bson.GuidRepresentation.Standard by default, instead of the default driver setting of MongoDB.Bson.GuidRepresentation.CSharpLegacy. This can cause issues if you have been using the driver on an existing application previously or if you are using CosmosDB.

You can override this behaviour to enforce legacy behaviour in your app Startup routine like so :

MongoDbContext.SetGuidRepresentation(MongoDB.Bson.GuidRepresentation.CSharpLegacy). More info here.

Usage examples

This repository is meant to be inherited from.

You are responsible for managing its lifetime, it is advised to setup this repository as a singleton.

Here is an example of repository usage, where the TestRepository is implementing 2 custom methods:

    public interface ITestRepository : IBaseMongoRepository
    {
        void DropTestCollection<TDocument>();
        void DropTestCollection<TDocument>(string partitionKey);
    }
    
    public class TestRepository : BaseMongoRepository, ITestRepository
    {
        public TestRepository(string connectionString, string databaseName) : base(connectionString, databaseName)
        {
        }

        public void DropTestCollection<TDocument>()
        {
            MongoDbContext.DropCollection<TDocument>();
        }

        public void DropTestCollection<TDocument>(string partitionKey)
        {
            MongoDbContext.DropCollection<TDocument>(partitionKey);
        }
    }

If all your documents have the same type of Id, you can use the more specific BaseMongoRepository<TKey> where TKey is the type of the Id of your documents.

    public class TestTKeyRepository<TKey> : BaseMongoRepository<TKey>, ITestRepository<TKey> where TKey : IEquatable<TKey>
    {
        const string connectionString = "mongodb://localhost:27017/MongoDbTests";
        private static readonly ITestRepository<TKey> _instance = new TestTKeyRepository<TKey>(connectionString);
        /// <inheritdoc />
        private TestTKeyRepository(string connectionString) : base(connectionString)
        {
        }
    }

Instantiation

The repository can be instantiated like so:

ITestRepository testRepository = new TestRepository(connectionString, "MongoDbTests");
ITestRepository<TKey> testTKeyRepository = new TestTKeyRepository<TKey>(connectionString);

If you prefer to reuse the same MongoDb database across your application, you can use the MongoDatabase from the MongoDb driver implementing the IMongoDatabase interface:

var client = new MongoClient(connectionString);
var mongoDbDatabase = Client.GetDatabase(databaseName);
ITestRepository testRepository = new TestRepository(mongoDbDatabase);

Adding documents

To add a document, its class must inherit from the Document class, implement the IDocument or IDocument<TKey> interface:

    public class MyDocument : Document
    {
        public MyDocument()
        {
            Version = 2; // you can bump the version of the document schema if you change it over time
        }
        public string SomeContent { get; set; }
    }

The IDocument and IDocument<TKey> interfaces can be seen below:

    /// <summary>
    /// This class represents a basic document that can be stored in MongoDb.
    /// Your document must implement this class in order for the MongoDbRepository to handle them.
    /// </summary>
    public interface IDocument
    {
        Guid Id { get; set; }
        int Version { get; set; }
    }
    
    /// <summary>
    /// This class represents a basic document that can be stored in MongoDb.
    /// Your document must implement this class in order for the MongoDbRepository to handle them.
    /// </summary>
    public interface IDocument<TKey> where TKey : IEquatable<TKey>
    {
        /// <summary>
        /// The Primary Key, which must be decorated with the [BsonId] attribute 
        /// if you want the MongoDb C# driver to consider it to be the document ID.
        /// </summary>
        [BsonId]
        TKey Id { get; set; }
        /// <summary>
        /// A version number, to indicate the version of the schema.
        /// </summary>
        int Version { get; set; }
    }

Partitioned collections

This repository also allows you to partition your document across multiple collections, this can be useful if you are running a SaaS application and want to keep good performance.

To use partitioned collections, you must define your documents using the PartitionedDocument class, which implements the IPartitionedDocument interface:

    public class MyPartitionedDocument : PartitionedDocument
    {
        public MyPartitionedDocument(string myPartitionKey) : base(myPartitionKey)
        {
            Version = 1;
        }
        public string SomeContent { get; set; }
    }

This partitioned key will be used as a prefix to your collection name. The collection name is derived from the name of the type of your document, is set to camel case, and is pluralized using a class taken from Humanizer (https://github.com/Humanizr/Humanizer).

var myDoc = new MyPartitionedDocument("myPartitionKey");
_testRepository.AddOne(myDoc);

The above code will generate a collection named myPartitionKey-myPartitionedDocuments.

CollectionName Attribute

It is now possible to change the collection name by using the CollectionName attribute:

    [CollectionName("MyCollectionName")]
    public class MyDocument : Document
    {
        public MyDocument()
        {
            Version = 2;
        }
        public string SomeContent { get; set; }
    }

Documents of this type will be inserted into a collection named "MyCollectionName".

Index Management

From version 1.3.8 the MongoDbGenericRepository implements the IBaseMongoRepository_Index and IBaseMongoRepository_Index<TKey> interfaces. This exposes the functionality to programmatically manage indexes against your collections in a generic fashion.

The following methods are exposed and fully integration tested:

CreateAscendingIndexAsync
CreateDescendingIndexAsync
CreateCombinedTextIndexAsync
CreateHashedIndexAsync
CreateTextIndexAsync
DropIndexAsync
GetIndexesNamesAsync

Usage examples:

	string expectedIndexName = $"myCustomIndexName";
	var option = new IndexCreationOptions
	{
		Name = expectedIndexName
	};
	// Act
	// create a text index against the Version property of the document.
	var result = await SUT.CreateTextIndexAsync<T, TKey>(x => x.Version, option, PartitionKey);

	// Assert
	var listOfIndexNames = await SUT.GetIndexesNamesAsync<T, TKey>(PartitionKey);
	Assert.Contains(expectedIndexName, listOfIndexNames);

	// Cleanup
	await SUT.DropIndexAsync<T, TKey>(expectedIndexName, PartitionKey);

Please refer to the IntegrationTests (NET45) and CoreIntegrationTests (netstandard2.0) projects for more usage examples. The CoreIntegrationTests.Infrastructure.MongoDbTKeyDocumentTestBase<T, TKey> test class is a good start.

Author

Alexandre Spieser

License

mongodb-generic-repository is under MIT license - http://www.opensource.org/licenses/mit-license.php

The MIT License (MIT)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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