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Working with MongoDB in .Net Core (Part 2) - Mongo Collection Base



Mongo Repository - C#

Here we introduce an encapsulation called BaseRepository which every other repository created in the application uses to perform Mongo database Operations.

BaseRepository

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public abstract class BaseRepository<T>
{
    private readonly IMongoCollection<T> _collection;

    public BaseRepository(IMongoConnectionManager connectionManager, string collectionName)
    {
        _collection = connectionManager.GetCollection<T>(collectionName)
    }
}

Mongo Database Operation Types

//FindAsync - GetMany and GetSingle
protected async Task<T> GetSingle(FilterDefinition<T> filter, FindOptions<T,T> options = null)
{
    var retval = await _collection.FindAsync(filter, options).ConfigureAwait(false);  return retval.FirstOrDefault();
}

protected async Task<T> Get(FilterDefinition<T> filter, SortDefinition<T> sort = null)
{
    var retval = await _collection.FindAsync(filter, new FindOptions<T,T>() { Sort = sort }).ConfigureAwait(false);  return retval.ToList();
}

//CountAsync
protected async Task<bool> Exists(FilterDefinition<T> filter)
{
    var count = await _collection.CountAsync(filter).ConfigureAwait(false);  return count > 0;
}

//InsertManyAsync
protected async Task Insert(IEnumerable<T> documents)
{
    await _collection.InsertManyAsync(documents).ConfigureAwait(false); 
}

//UpdateManyAsync
protected async Task Update(FilterDefinition<T> filter, UpdateDefinition<T> update)
{
    await _collection.UpdateManyAsync(filter, update).ConfigureAwait(false);  
}

//BulkUpdate
protected async Task BulkUpdate(List<WriteModel<T>> updates)
{
    await _collection.BulkWriteAsync(updates).ConfigureAwait(false);  
}

//List<WriteModel<T> Builder
var updates = new List<WriteModel<T>>();
foreach(var request in requests)-
{
    var filter = Builders<T>.Filter.Eq(_=>_.Id, request.Id);
    udpates.Add(new ReplaceOneModel<T>(filter, request));
}

//DeleteManyAsync
protected async Task Delete(FilterDefinition<T> filter)
{
    await _collection.DeleteManyAsync(filter).ConfigureAwait(false);
}

//AggregateAsync
protected async Task<IEnumerable<TOutput> Aggregate<TOutput>(PipelineDefinition<T,TOutput> pipeline)
{
    var options = new AggregateOptions { AllowDiskUse = true};
    return (await _collection.AggregateAsync(pipeline, options).ConfigureAwait(false)).ToList();
}

//DistinctAsync
var filter = new BsonDocument();
var list = await _collection.DistinctAsync<string>("categories", filter);

//Other Collection Operations
1.  UpdateOneAsync
2.  FindOneAndDelete
3.  FindOneAndReplace
4.  FindOneAndUpdate
5.  InsertOneAsync
6.  ReplaceOneAsync

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