public override ScaffoldedModel GenerateModel(IModel model, ModelCodeGenerationOptions options)
    {
        if (options.ContextName == null)
        {
            throw new ArgumentException(
                      CoreStrings.ArgumentPropertyNull(nameof(options.ContextName), nameof(options)), nameof(options));
        }

        if (options.ConnectionString == null)
        {
            throw new ArgumentException(
                      CoreStrings.ArgumentPropertyNull(nameof(options.ConnectionString), nameof(options)), nameof(options));
        }

        var resultingFiles = new ScaffoldedModel();

        var contextTemplate = Path.Combine(options.ProjectDir !, TemplatesDirectory, "DbContext.t4");

        Check.DebugAssert(_host.Session == null, "Session is not null.");
        _host.Session = _host.CreateSession();
        try
        {
            _host.Session.Add("Model", model);
            _host.Session.Add("Options", options);
            _host.Session.Add("NamespaceHint", options.ContextNamespace ?? options.ModelNamespace);
            _host.Session.Add("ProjectDefaultNamespace", options.RootNamespace);

            var handler       = new TextTemplatingCallback();
            var generatedCode = ProcessTemplate(contextTemplate, handler);

            var dbContextFileName = options.ContextName + handler.Extension;
            resultingFiles.ContextFile = new ScaffoldedFile
            {
                Path = options.ContextDir != null
                    ? Path.Combine(options.ContextDir, dbContextFileName)
                    : dbContextFileName,
                Code = generatedCode
            };
        }
        finally
        {
            _host.Session = null;
        }

        var entityTypeTemplate = Path.Combine(options.ProjectDir !, TemplatesDirectory, "EntityType.t4");

        if (File.Exists(entityTypeTemplate))
        {
            foreach (var entityType in model.GetEntityTypes())
            {
                // TODO: Should this be handled inside the template?
                if (CSharpDbContextGenerator.IsManyToManyJoinEntityType(entityType))
                {
                    continue;
                }

                _host.Session = _host.CreateSession();
                try
                {
                    _host.Session.Add("EntityType", entityType);
                    _host.Session.Add("Options", options);
                    _host.Session.Add("NamespaceHint", options.ModelNamespace);
                    _host.Session.Add("ProjectDefaultNamespace", options.RootNamespace);

                    var handler       = new TextTemplatingCallback();
                    var generatedCode = ProcessTemplate(entityTypeTemplate, handler);
                    if (string.IsNullOrWhiteSpace(generatedCode))
                    {
                        continue;
                    }

                    var entityTypeFileName = entityType.Name + handler.Extension;
                    resultingFiles.AdditionalFiles.Add(
                        new ScaffoldedFile {
                        Path = entityTypeFileName, Code = generatedCode
                    });
                }
                finally
                {
                    _host.Session = null;
                }
            }
        }

        return(resultingFiles);
    }