class Mongo::Database

• Mongo::Database
• Reference
• Object

Overview

A Database provides access to a MongoDB database.

database = client["database_name"]

Included Modules

• Mongo::WithReadConcern
• Mongo::WithReadPreference
• Mongo::WithWriteConcern

Defined in:

Instance Method Summary

• #[](collection : Collection::CollectionKey) : Mongo::Collection

  Get a newly allocated Mongo::Collection for the collection named name.

• #aggregate(pipeline : Array, *, allow_disk_use : Bool | Nil = nil, batch_size : Int32 | Nil = nil, max_time_ms : Int64 | Nil = nil, bypass_document_validation : Bool | Nil = nil, read_concern : ReadConcern | Nil = nil, collation : Collation | Nil = nil, hint : String | H | Nil = nil, comment : String | Nil = nil, write_concern : WriteConcern | Nil = nil, session : Session::ClientSession | Nil = nil) : Mongo::Cursor | Nil forall H

  Runs an aggregation framework pipeline on the database for pipeline stages that do not require an underlying collection, such as $currentOp and $listLocalSessions.

• #client : Mongo::Client

  The underlying MongoDB client.

• #collection(collection : Collection::CollectionKey) : Mongo::Collection

  Get a newly allocated Mongo::Collection for the collection named name.

• #command(operation, write_concern : WriteConcern | Nil = nil, read_concern : ReadConcern | Nil = nil, read_preference : ReadPreference | Nil = nil, session : Session::ClientSession | Nil = nil, **args, &)

  Execute a command on the server targeting the database.

• #command(operation, write_concern : WriteConcern | Nil = nil, read_concern : ReadConcern | Nil = nil, read_preference : ReadPreference | Nil = nil, session : Session::ClientSession | Nil = nil, **args)

  Execute a command on the server targeting the database.

• #grid_fs(bucket_name : String = "fs", *, chunk_size_bytes : Int32 = 255 * 1024, write_concern : WriteConcern | Nil = nil, read_concern : ReadConcern | Nil = nil, read_preference : ReadPreference | Nil = nil) : GridFS::Bucket

  Returns a Mongo::GridFS instance configured with the arguments provided.

• #list_collections(*, filter = nil, name_only : Bool | Nil = nil, authorized_collections : Bool | Nil = nil, session : Session::ClientSession | Nil = nil) : Mongo::Cursor

  Retrieve information, i.e.

• #name : String

  The database name.

• #read_concern : ReadConcern | Nil

  Read concern accessor.

• #read_concern=(read_concern : ReadConcern | Nil)

  Read concern accessor.

• #read_preference : ReadPreference | Nil

  ReadPreference accessor.

• #read_preference=(read_preference : ReadPreference | Nil)

  ReadPreference accessor.

• #stats(*, scale : Int32 | Nil = nil) : BSON | Nil

  Returns a variety of storage statistics for the database.

• #watch(pipeline : Array = [] of BSON, *, full_document : String | Nil = nil, resume_after : BSON | Nil = nil, max_await_time_ms : Int64 | Nil = nil, batch_size : Int32 | Nil = nil, collation : Collation | Nil = nil, start_at_operation_time : Time | Nil = nil, start_after : BSON | Nil = nil, read_concern : ReadConcern | Nil = nil, read_preference : ReadPreference | Nil = nil, session : Session::ClientSession | Nil = nil) : Mongo::ChangeStream::Cursor

  Returns a ChangeStream::Cursor watching all the database collection.

• #write_concern : WriteConcern | Nil

  Write concern accessor.

• #write_concern=(write_concern : WriteConcern | Nil)

  Write concern accessor.

Instance Method Detail

client = Mongo::Client.new
database = client["db"]

spawn {
  cursor = database.watch(
    [
      {"$match": {"operationType": "insert"}},
    ],
    max_await_time_ms: 10000
  )
  # cursor.of(BSON) converts to the Mongo::ChangeStream::Document(BSON) type.
  cursor.of(BSON).each { |doc|
    puts doc.to_bson.to_json
  }
}

100.times do |i|
  database["collection"].insert_one({count: i})
end

sleep