ancestry | Organise ActiveRecord model into a tree structure | Application Framework library
kandi X-RAY | ancestry Summary
kandi X-RAY | ancestry Summary
Ancestry is a gem that allows the records of a Ruby on Rails ActiveRecord model to be organised as a tree structure (or hierarchy). It employs the materialised path pattern and exposes all the standard tree structure relations (ancestors, parent, root, children, siblings, descendants), allowing all of them to be fetched in a single SQL query. Additional features include STI support, scopes, depth caching, depth constraints, easy migration from older gems, integrity checking, integrity restoration, arrangement of (sub)trees into hashes, and various strategies for dealing with orphaned records.
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Top functions reviewed by kandi - BETA
- Check that the ancestors are valid
- Sorts a list of nodes by descending order .
- Update the ancestry of a node
- Returns true if the parent_id is valid .
- View an array of children
- Return an array of ancestors for the given node
- Updates the parent cache
- Rebuild the cache
- Recursively builds all ancestors for this node
- Configure a depth depth
ancestry Key Features
ancestry Examples and Code Snippets
Community Discussions
Trending Discussions on ancestry
QUESTION
I want to print parent name in excel
this is my code
...ANSWER
Answered 2021-Mar-25 at 06:08You need to register an association between two Product
models like this:
QUESTION
I am currently trying to scrape the "imageToken" value from a script tag from the below page source, the python code below will get the token about 75% of the time, but the other times the number of the script tag must be changing and it is selecting the wrong tag.
Is there any way to search through all the scrip tags for specifically the tag that contains the "imageToken"?
here is the code that is working 75% of the time.
...ANSWER
Answered 2021-Feb-21 at 22:48To search a tag containing specific text, you can use the :contains()
Selector.
In your example to see if the script
contains the text imageToken
use:
QUESTION
The collection:
...ANSWER
Answered 2021-Jan-23 at 12:11You were not sufficiently clear about what was the result of your approaches. Do they give execution errors or don't they bring the results you expected?
For the first problem, it seems that alive and hogwartsStudents are of boolean type, so I recommend to use true instead of "true"
QUESTION
I am trying to convert a svn repo to a git repo. I therefore followed the second (most upvoted) answer of a previous SO question. I only diverged by converting svn tags to git tags and created annotated, not lightweight tags, like so:
...ANSWER
Answered 2021-Jan-20 at 17:02I think I have figured out the answer for this question after some long trial and error. The code to create tags when migrating a svn repo to a git repo instructs creating branches for each tag, like so
QUESTION
Here I display characters in table js
...ANSWER
Answered 2020-Nov-22 at 15:40The easiest solution is to add background color to your data and use it in the map function.
QUESTION
I wanna find the lower ancestor in a binary tree, and what i do is first, list the fathers of each node, then compare the list and the last item in common is the lower ancestry.
I have this code:
...ANSWER
Answered 2020-Nov-21 at 16:43In short, do not use mutable object (like list) as a default value.
This is Anti-Pattern, because in Python the default value is shared between all function calls. so it must be immutable. popular option is None and condition if not None: ...
You can also read here
QUESTION
I found this quote in a paper:
In individuals of Northern European ancestry, as many as 8 percent of men and 0.5 percent of women experience the common form of red-green color blindness. If a submitted manuscript happens to go to three male reviewers of Northern European descent, the chance that at least one will be color blind is 22 percent.
Wong, B.: Points of view: Color blindness, Nat Methods, 8(6), 441–441, doi:10.1038/nmeth.1618, 2011.
How could I calculate this in R? Thanks in advance.
...ANSWER
Answered 2020-Nov-04 at 15:52This is a pretty easy problem to solve, without using a deep understanding of binomial distributions.
QUESTION
I have HTML structure like this:
...ANSWER
Answered 2020-Sep-21 at 21:31The selector sought for is > *
:
QUESTION
I'm using the Administrate gem in my Rails 6 application. I have created a category model and I'm using the ancestry gem to organise the tree structure etc. I'm having trouble trying to integrate the ancestry gem into Administrate. Mainly an issue where the parent_id for ancestry gem is null so and 2. trying to display the child name/relationships in Administrate.
- The Administrate gem because of the relationship will not accept a null value when editing the form is "ancestry" is added to the dashboard form in administrate.
- Another problem I am trying to overcome is displaying the associated name of a child the id that ancestry uses. So ancestry using a string field which helps locate the parent using the id of the category row. I have no idea how to manipulate the Administrate dashboard/controller to display the field name.
Any help would be so much appreciated. I've googled this one for a bit and cannot seem to find anything related to the same problem.
Is it worth using Ancestry and Administrate together? Or should I just create my own category controller and views to allow Admin to modify the category data? I'd prefer to try to keep all admin stuff in Administrate if possible.
Thanks a mil.
...ANSWER
Answered 2020-Sep-08 at 11:02Just adding my solution below in case anyone else comes across the question.
To allow Administrate to accept a null value even though there might be presence required because of the ancestry gem use of the relationship in the model. eg.
QUESTION
I am filtering ancestry from the ABS in Australia. I am taking ancestry data as below.
...ANSWER
Answered 2020-Aug-19 at 21:12I believe (at least part of) the question you're asking is how to filter a pandas dataframe using regex. For data I used some of the venue values you provided in your array. For your use case, this would be done as follows:
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