Apex Developer Guide
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Update a Repository File Without Content (Metadata Only)
Call a method to update the metadata of a repository file.
Call updateRepositoryFile(repositoryId, repositoryFileId, file) to update the
metadata of a file in a repository folder. After the file is updated, we show the file’s ID,
name, description, external URL, download
URL.
final String gDriveRepositoryId = '0XCxx00000000ODGAY', gDriveFolderId = 'folder:0B0lTys1KmM3sSVJ2bjIzTGFqSWs', gDriveFileId = 'document:1q9OatVpcyYBK-JWzp_PhR75ulQghwFP15zhkamKrRcQ';
final ConnectApi.ContentHubItemInput updatedItem = new ConnectApi.ContentHubItemInput();
updatedItem.itemTypeId = 'document'; //see getAllowedTypes for any file item types available for creation/update
updatedItem.fields = new List<ConnectApi.ContentHubFieldValueInput>();
//Metadata: name field
final ConnectApi.ContentHubFieldValueInput fieldValueInputName = new ConnectApi.ContentHubFieldValueInput();
fieldValueInputName.name = 'name';
fieldValueInputName.value = 'updated file name.txt';
updatedItem.fields.add(fieldValueInputName);
final ConnectApi.RepositoryFileDetail updatedFile = ConnectApi.ContentHub.updateRepositoryFile(gDriveRepositoryId, gDriveFileId, updatedItem);
System.debug(String.format('Updated file - id: \'\'{0}\'\', name: \'\'{1}\'\', description: \'\'{2}\'\',\n external URL: \'\'{3}\'\', download URL: \'\'{4}\'\'', new String[]{ updatedFile.id, updatedFile.name, updatedFile.description, updatedFile.externalDocumentUrl, updatedFile.downloadUrl}));