RUBY-945 Add list_databases and list_collections helpers

Author: estolfo

lib/mongo/client.rb

@@ -232,20 +232,18 @@ def write_concern
     #
     # @since 2.0.5
     def database_names
-      use(Database::ADMIN).command(
-        listDatabases: 1
-      ).first['databases'].collect{ |info| info['name'] }
+      list_databases.collect{ |info| info['name'] }
     end
 
     # Get info for each database.
     #
-    # @example Get the database info.
-    #   client.database_info
+    # @example Get the info for each database.
+    #   client.list_databases
     #
-    # @return [ Array<Hash ] The info for each database.
+    # @return [ Array<Hash> ] The info for each database.
     #
     # @since 2.0.5
-    def database_info
+    def list_databases
       use(Database::ADMIN).command(
         listDatabases: 1
       ).first['databases']

lib/mongo/database.rb

@@ -102,6 +102,18 @@ def collection_names(options = {})
       View.new(self).collection_names(options)
     end
 
+    # Get info on all the collections in the database.
+    #
+    # @example Get info on each collection.
+    #   database.list_collections
+    #
+    # @return [ Array<Hash> ] Info for each collection in the database.
+    #
+    # @since 2.0.5
+    def list_collections
+      View.new(self).list_collections
+    end
+
     # Get all the collections that belong to this database.
     #
     # @example Get all the collections.

lib/mongo/database/view.rb

@@ -57,6 +57,18 @@ def collection_names(options = {})
         end
       end
 
+      # Get info on all the collections in the database.
+      #
+      # @example Get info on each collection.
+      #   database.list_collections
+      #
+      # @return [ Array<Hash> ] Info for each collection in the database.
+      #
+      # @since 2.0.5
+      def list_collections
+        collections_info(next_primary)
+      end
+
       # Create the new database view.
       #
       # @example Create the new database view.

spec/mongo/client_spec.rb

@@ -579,11 +579,11 @@
     end
   end
 
-  describe '#database_info' do
+  describe '#list_databases' do
 
     it 'returns a list of database info documents' do
       expect(
-        root_authorized_client.database_info.collect do |i|
+        root_authorized_client.list_databases.collect do |i|
           i['name']
         end).to include('admin', 'local', TEST_DB)
     end

spec/mongo/database_spec.rb

@@ -95,6 +95,35 @@
     end
   end
 
+  describe '#list_collections' do
+
+    let(:database) do
+      described_class.new(authorized_client, TEST_DB)
+    end
+
+    let(:result) do
+      database.list_collections.map do |info|
+        info['name']
+      end
+    end
+
+    before do
+      database[:users].create
+    end
+
+    after do
+      database[:users].drop
+    end
+
+    it 'returns a list of the collections info', if: write_command_enabled?  do
+      expect(result).to include('users')
+    end
+
+    it 'returns a list of the collections info', unless: write_command_enabled?  do
+      expect(result).to include("#{TEST_DB}.users")
+    end
+  end
+
   describe '#collections' do
 
     context 'when the database exists' do