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    Configure Revisions Operation

    • Use ConfigureRevisionsOperation to apply the following revisions configuration to the database:

      • Default configuration - applies to all document collections.
      • Collection-specific configurations - override the default settings for these collections.
      • To apply a configuration for conflict document revisions see configure conflict revisions.

    • The configuration passed to this operation will REPLACE the current revisions configuration in the database.
      To MODIFY existing configuration, fetch the current configuration from the database record first.

    • After applying the configuration,
      revisions are created and purged for a document whenever the document is created, modified, or deleted.

    • To create a revision when there is no configuration defined (or enabled) see: force revision creation

    • By default, the operation will be applied to the default database.
      To operate on a different database see switch operations to different database.

    • In this page:

    Replace configuration

    • In this example, we create a new RevisionsConfiguration for the database.
      If revisions configuration already exists in the database - it will be replaced.

    // ==============================================================================
// Define default settings that will apply to ALL collections
// Note: this is optional
var defaultRevConfig = new RevisionsCollectionConfiguration()
{
    MinimumRevisionsToKeep = 100,
    MinimumRevisionAgeToKeep = new TimeSpan(days: 7, 0, 0, 0),
    MaximumRevisionsToDeleteUponDocumentUpdate = 15,
    PurgeOnDelete = false,
    Disabled = false
    
    // With this configuration:
    // ------------------------
    // * A revision will be created anytime a document is modified or deleted.
    // * Revisions of a deleted document can be accessed in the Revisions Bin view.
    // * At least 100 of the latest revisions will be kept.
    // * Older revisions will be removed if they exceed 7 days on next revision creation.
    // * A maximum of 15 revisions will be deleted each time a document is updated,
    //   until the defined '# of revisions to keep' limit is reached.
};

// ==============================================================================
// Define a specific configuration for the EMPLOYEES collection
// This will override the default settings 
var employeesRevConfig = new RevisionsCollectionConfiguration()
{
    MinimumRevisionsToKeep = 50,
    MinimumRevisionAgeToKeep = new TimeSpan(hours: 12, minutes: 0, seconds: 0),
    PurgeOnDelete = true,
    Disabled = false
    
    // With this configuration:
    // ------------------------
    // * A revision will be created anytime an Employee document is modified.
    // * When a document is deleted all its revisions will be removed.
    // * At least 50 of the latest revisions will be kept.
    // * Older revisions will be removed if they exceed 12 hours on next revision creation.
};

// ==============================================================================
// Define a specific configuration for the PRODUCTS collection
// This will override the default settings 
var productsRevConfig = new RevisionsCollectionConfiguration()
{
    Disabled = true 
    // No revisions will be created for the Products collection,
    // even though default configuration is enabled
};

// ==============================================================================
// Combine all configurations in the RevisionsConfiguration object
var revisionsConfig = new RevisionsConfiguration()
{
    Default = defaultRevConfig,
    Collections = new Dictionary<string, RevisionsCollectionConfiguration>()
    {
        { "Employees", employeesRevConfig },
        { "Products", productsRevConfig }
    }
};

// ==============================================================================
// Define the configure revisions operation, pass the configuration
var configureRevisionsOp = new ConfigureRevisionsOperation(revisionsConfig);

// Execute the operation by passing it to Maintenance.Send
// Any existing configuration will be replaced with the new configuration passed
documentStore.Maintenance.Send(configureRevisionsOp);
    // ==============================================================================
// Define default settings that will apply to ALL collections
// Note: this is optional
var defaultRevConfig = new RevisionsCollectionConfiguration()
{
    MinimumRevisionsToKeep = 100,
    MinimumRevisionAgeToKeep = new TimeSpan(days: 7, 0, 0, 0),
    MaximumRevisionsToDeleteUponDocumentUpdate = 15,
    PurgeOnDelete = false,
    Disabled = false,
    
    // With this configuration:
    // ------------------------
    // * A revision will be created anytime a document is modified or deleted.
    // * Revisions of a deleted document can be accessed in the Revisions Bin view.
    // * At least 100 of the latest revisions will be kept.
    // * Older revisions will be removed if they exceed 7 days on next revision creation.
    // * A maximum of 15 revisions will be deleted each time a document is updated,
    //   until the defined '# of revisions to keep' limit is reached.
};

// ==============================================================================
// Define a specific configuration for the EMPLOYEES collection
// This will override the default settings 
var employeesRevConfig = new RevisionsCollectionConfiguration()
{
    MinimumRevisionsToKeep = 50,
    MinimumRevisionAgeToKeep = new TimeSpan(hours: 12, minutes: 0, seconds: 0),
    PurgeOnDelete = true,
    Disabled = false
   
    // With this configuration:
    // ------------------------
    // * A revision will be created anytime an Employee document is modified.
    // * When a document is deleted all its revisions will be removed.
    // * At least 50 of the latest revisions will be kept.
    // * Older revisions will be removed if they exceed 12 hours on next revision creation.
};
    
// ==============================================================================
// Define a specific configuration for the PRODUCTS collection
// This will override the default settings 
var productsRevConfig = new RevisionsCollectionConfiguration()
{
    Disabled = true 
    // No revisions will be created for the Products collection,
    // even though default configuration is enabled
};

// ==============================================================================
// Combine all configurations in the RevisionsConfiguration object
var revisionsConfig = new RevisionsConfiguration()
{
    Default = defaultRevConfig,
    Collections = new Dictionary<string, RevisionsCollectionConfiguration>()
    {
        { "Employees", employeesRevConfig },
        { "Products", productsRevConfig }
    }
};

// ==============================================================================
// Define the configure revisions operation, pass the configuration
var configureRevisionsOp = new ConfigureRevisionsOperation(revisionsConfig);
               
// Execute the operation by passing it to Maintenance.SendAsync
// Any existing configuration will be replaced with the new configuration passed
await documentStore.Maintenance.SendAsync(configureRevisionsOp);

    Modify configuration

    • In this example, we fetch the existing revisions configuration from the database record and modify it. 

    // ==============================================================================
// Define the get database record operation:
var getDatabaseRecordOp = new GetDatabaseRecordOperation(documentStore.Database);
// Get the current revisions configuration from the database record:
RevisionsConfiguration revisionsConfig =
    documentStore.Maintenance.Server.Send(getDatabaseRecordOp).Revisions;

// ==============================================================================
// If no revisions configuration exists, then create a new configuration
if (revisionsConfig == null)
{
    revisionsConfig = new RevisionsConfiguration()
    {
        Default = defaultRevConfig,
        Collections = new Dictionary<string, RevisionsCollectionConfiguration>()
        {
            { "Employees", employeesRevConfig },
            { "Products", productsRevConfig }
        }
    };
}

// ==============================================================================
// If a revisions configuration already exists, then modify it
else
{
    revisionsConfig.Default = defaultRevConfig;
    revisionsConfig.Collections["Employees"] = employeesRevConfig;
    revisionsConfig.Collections["Products"] = productsRevConfig;
}

// ==============================================================================
// Define the configure revisions operation, pass the configuration
var configureRevisionsOp = new ConfigureRevisionsOperation(revisionsConfig);

// Execute the operation by passing it to Maintenance.Send
// The existing configuration will be updated
documentStore.Maintenance.Send(configureRevisionsOp);
    // ==============================================================================
// Define the get database record operation:
var getDatabaseRecordOp = new GetDatabaseRecordOperation(documentStore.Database);
// Get the current revisions configuration from the database record:
RevisionsConfiguration revisionsConfig =
    documentStore.Maintenance.Server.Send(getDatabaseRecordOp).Revisions;

// ==============================================================================
// If no revisions configuration exists, then create a new configuration
if (revisionsConfig == null)
{
    revisionsConfig = new RevisionsConfiguration()
    {
        Default = defaultRevConfig,
        Collections = new Dictionary<string, RevisionsCollectionConfiguration>()
        {
            { "Employees", employeesRevConfig },
            { "Products", productsRevConfig }
        }
    };
}

// ==============================================================================
// If a revisions configuration already exists, then modify it
else
{
    revisionsConfig.Default = defaultRevConfig;
    revisionsConfig.Collections["Employees"] = employeesRevConfig;
    revisionsConfig.Collections["Products"] = productsRevConfig;
}

// ==============================================================================
// Define the configure revisions operation, pass the configuration
var configureRevisionsOp = new ConfigureRevisionsOperation(revisionsConfig);

// Execute the operation by passing it to Maintenance.SendAsync
// The existing configuration will be updated
await documentStore.Maintenance.SendAsync(configureRevisionsOp);

    Syntax 

    public ConfigureRevisionsOperation(RevisionsConfiguration configuration);
    Parameter Type Description
    configuration RevisionsConfiguration The revisions configuration to apply 

    public class RevisionsConfiguration
{
    public RevisionsCollectionConfiguration Default;
    public Dictionary<string, RevisionsCollectionConfiguration> Collections;
}
    Property Type Description
    Default RevisionsCollectionConfiguration Optional default settings that apply to any collection Not specified in Collections.
    Collections Dictionary<string, RevisionsCollectionConfiguration> A Dictionary of collection-specific configurations
    The keys are the collection names
    The values are the corresponding configurations.
    Overrides the default settings for the collections defined.    		 

    public class RevisionsCollectionConfiguration
{
    public long? MinimumRevisionsToKeep { get; set; }
    public TimeSpan? MinimumRevisionAgeToKeep { get; set; }
    public long? MaximumRevisionsToDeleteUponDocumentUpdate { get; set; }
    public bool PurgeOnDelete { get; set; }
    public bool Disabled { get; set; }
}

    Property Type Description
    MinimumRevisionsToKeep long
    • This number of revisions will be kept per document.
    • Older revisions exceeding this number will be purged upon the next document modification.
    • Default : null = no limit
    MinimumRevisionAgeToKeep TimeSpan
    • Limit the number of revisions kept per document by their age.
    • Revisions that are older than this time will be purged upon the next document modification.
    • Default : null = no age limit
      MaximumRevisionsToDeleteUponDocumentUpdate long
      • The maximum number of revisions to delete upon each document modification.
      • Default : null = no limit,
        all revisions that pend purging will be deleted.
      PurgeOnDelete bool
      • false ( Default ) - Revisions of a deleted document are moved to the Revisions Bin.
      • true - When a document is deleted all its revisions are also deleted.
      Disabled bool
      • false ( Default ) - Revisions will be created and purged according to the configuration.
      • true - No revisions will be created or purged.

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