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Type:
Improvement
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Resolution: Fixed
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Priority:
Minor - P4
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Affects Version/s: None
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Component/s: Docs
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Environment:test
Hi Team,
pre-context: I'm pretty new using mongo and I'm dealing with some recursively embeds many structure for creating a tree of folders that I need to handle, and the problem is that I can't figure out a way to get a particular folder from that tree.
This is my version of mongo from my Gemfile.lock
mongo (2.6.2) bson (>= 4.3.0, < 5.0.0) mongoid (7.0.1) activemodel (>= 5.1, < 6.0.0) mongo (>= 2.5.1, < 3.0.0)
The Model I did is:
| class Folder |
| include Mongoid::Document |
| field :name, type: String |
| field :permissions, type: String |
| recursively_embeds_many |
| end |
I started with a simple 1 level structure
/: (root_folder) --> 'ex' (child_folder) --> 'aut' (child_folder) --> 'dolorem' (child_folder) --> 'et' (child_folder) --> 'etc' (child_folder)
2.5.1 :031 > root.child_folders.count => 5 2.5.1 :030 > root.child_folders => [#<Folder _id: 5bb52d1b63623919f778f8b1, created_at: 2018-10-03 20:56:59 UTC, updated_at: 2018-10-03 20:56:59 UTC, name: "ex", path: "/accounts/5bb52cc863623919f778f8aa/sapiente/ex", permissions: "ro", item_count: 0, account_id: BSON::ObjectId('5bb52cc863623919f778f8aa')>, #<Folder _id: 5bb52d1b63623919f778f8b2, created_at: 2018-10-03 20:56:59 UTC, updated_at: 2018-10-03 20:56:59 UTC, name: "aut", path: "/accounts/5bb52cc863623919f778f8aa/sapiente/aut", permissions: "rw", item_count: 0, account_id: BSON::ObjectId('5bb52cc863623919f778f8aa')>, #<Folder _id: 5bb52d1b63623919f778f8b3, created_at: 2018-10-03 20:56:59 UTC, updated_at: 2018-10-03 20:56:59 UTC, name: "dolorem", path: "/accounts/5bb52cc863623919f778f8aa/sapiente/dolorem", permissions: "ro", item_count: 0, account_id: BSON::ObjectId('5bb52cc863623919f778f8aa')>, #<Folder _id: 5bb52d1b63623919f778f8b4, created_at: 2018-10-03 20:56:59 UTC, updated_at: 2018-10-03 20:56:59 UTC, name: "et", path: "/accounts/5bb52cc863623919f778f8aa/sapiente/et", permissions: "rw", item_count: 0, account_id: BSON::ObjectId('5bb52cc863623919f778f8aa')>, #<Folder _id: 5bb52d1b63623919f778f8b5, created_at: 2018-10-03 20:56:59 UTC, updated_at: 2018-10-03 20:56:59 UTC, name: "etc", path: "/accounts/5bb52cc863623919f778f8aa/sapiente/et", permissions: "ro", item_count: 0, account_id: BSON::ObjectId('5bb52cc863623919f778f8aa')>]
So, searching in old issues I found a way to use 'elem_match' but when I tried It didnt work, as you can see below:
2.5.1 :032 > folder_found = root.child_folders.elem_match(child_folders: { 'name' => 'dolorem'})
=> #<Mongoid::Criteria
selector: {"child_folders"=>{"$elemMatch"=>{"name"=>"dolorem"}}}
options: {}
class: Folder
embedded: true>
2.5.1 :033 > folder_found.count
=> 0
The thing is that this is a trivial query and I couldnt make it work, and I need to do this in a structure of n levels (basically look for a particular folder which could be inside of another folder) like this:
/: (root_folder) --> 'xxxx' (child_folder) --> 'xxxx' (child_folder) --> 'xxxx' (child_folder) --> 'yyy' (child_folder) --> 'desire_folder' (child_folder) --> 'xxx' (child_folder) --> 'xxxx' (child_folder)
I'm not sure if this is the correct way to query in recursive embeds many structure or if I need to design something by myself to resolve this.
Hope to be clear enough and get any help that allows me to continue using the advantages of recursively_embeds_many.
- related to
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SERVER-736 Support for XPath like queries
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- Backlog
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- Closed
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