neo4j - How to delete nodes under a hierarchy in a single query -


i have challenge node can have comments posted under it. each comment node can in turn have comments posted under it, level.

visually, in image below:

enter image description here

when challenge node deleted, need able first delete entire hierarchy of comment nodes attached challenge node.

i've tried few queries not able figure out how use single query achieve effect. 1 query i'm trying deletes nodes @ level 2 is:

match (c:challenge {id: 'rjksss-4w'})<-[:posted_in]-(comment:comment)  c, comment  optional match (comment)<-[:posted_in]-(childcomment)  detach delete childcomment;

is there way write single query, can delete comment nodes posted under challenge node (including @ level 1, 2, ... )? in example illustrated above, 13 comment nodes deleted in single query.

try 

match (c:challenge {id: 'rjksss-4w'})<-[:posted_in*]-(comment:comment) detach delete comment

i would've commented don't have enough reputation


Comments

Post a Comment

Popular posts from this blog

javascript - Create a stacked percentage column -

i have collection of data : var data = [ {"p301a":"10","p301b":"7","p301c":"7","p301d":"3","p301e":"8","p301f":"8","p301g":"8","p301h":"8","p301i":"8","p301j":"8","p301k":"8","p301l":"8","p301m":"8","p301n":"8","p301o":"8","age":"31-40 years","profesion":"2","position":"2"}, {"p301a":"5","p301b":"4","p301c":"4","p301d":"4","p301e":"4","p301f":"4","p301g":"4","p301h":"4","p301i":"4","p301j":"4","p301k":"4...
Read more

Optimising Firebase database by automatically overwriting data -

in firebase app have following structure: posts latest all users can write posts > latest . want limit entries 20 posts save space in database. , posts beyond 20 unnecessary never shown on homepage. how can limit posts 20, when user writes posts > latest posts @ end drop off (be deleted) automatically? this sample should you. you need : const max_log_count = 20; exports.removeold = functions.database.ref('/posts/latest/{postid}').oncreate(event => { const parentref = event.data.ref.parent; return parentref.once('value').then(snapshot => { if (snapshot.numchildren() >= max_log_count) { let childcount = 0; const updates = {}; snapshot.foreach(function(child) { if (++childcount <= snapshot.numchildren() - max_log_count) { updates[child.key] = null; } }); // update parent. removes children. ...
Read more

javascript - Angular UI-Grid customTemplate directive causing rows to load slowly/? -

Image
each grid cell can have more 1 customtemplate loaded. have directive holds watcher on model_col_field listen cell updates on scroll when dom rows updated , recompile celltemplate . without watcher , $compile rows repeat on scroll, showing same set of rows. is there more angular way of approaching or way improve performance? relevant controller code: create gridoptions.data & gridoptions.columndefs : var customtemp = '<div ng-repeat="opt in grid.appscope.colvalueoptionsmodel" ng-init="tempstring=model_col_field.clazz+opt.key;"><comparison-directive dbo="model_col_field" attobj="opt" fff="grid.appscope.getattributetemplate(tempstring)" /></div>'; $scope.gridoptions.columndefs = [ { name:'yindex',pinnedleft:true,celltemplate: customtemp, displayname:'index'}, { name:'col1',celltemplate: customtemp}, { name:'col2',celltemplate: c...
Read more