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How to implement has_many :through relationships with Mongoid and mongodb?
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Out of curiosity (sorry for the late inquiry), I'm also new to Mongoid and I was wondering how you would query for data when it is an n-n relationship using a separate collection to store the association, is it the same as it...
Covariance, Invariance and Contravariance explained in plain English?
Today, I read some articles about Covariance, Contravariance (and Invariance) in Java. I read the English and German Wikipedia article, and some other blog posts and articles from IBM.
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Node.js / Express.js - How does app.router work?
Before I ask about app.router I think I should explain at least what I think happens when working with middleware. To use middleware, the function to use is app.use() . When the middleware is being executed, it will either call the next middleware by using next() or make it so no more middlewar...
What is the most efficient/elegant way to parse a flat table into a tree?
... ClosureTable a ON (f.id = a.descendant_id)
WHERE a.ancestor_id = 1;
The output (in MySQL client) looks like the following:
+----+
| id |
+----+
| 1 |
| 2 |
| 4 |
| 6 |
+----+
In other words, nodes 3 and 5 are excluded, because they're part of a separate hierarchy, not descending from n...
How to remove/delete a large file from commit history in Git repository?
...l resulted with the same message. So I'm also thinking that you're right about the remote server being configured to reject the non-fast-forward updates. I'll consider just pushing the updated repo to a brand new repo. Thank you!
– Tony
Feb 23 '14 at 23:30
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How do I make a Git commit in the past?
...hods when you run git commit.
---A---B---C---o---o---o master
git checkout master
git checkout A~0
git add path/to/file
git commit --date='whenever'
git tag ,new-commit -m'delete me later'
git checkout -
git rebase --onto ,new-commit A
git tag -d ,new-commit
---A---N (was "...
How to create a MySQL hierarchical recursive query
...re assigned and modified during its execution. Some assumptions are made about the order of execution:
The from clause is evaluated first. So that is where @pv gets initialised.
The where clause is evaluated for each record in the order of retrieval from the from aliases. So this is where a condit...
What is the difference between RDF and OWL? [closed]
...relationships which normal programming, such as a C struct, isn't fussed about and is closer to AI research & set theory.
Triples & URIs
Subject - Predicate - Object
These describe a single fact. Generally URI's are used for the subject and predicate. The object is either another URI or ...
When would anyone use a union? Is it a remnant from the C-only days?
...ts are simple: there is one single data type to handle all event types without using unnecessary memory.
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Most useful NLog configurations [closed]
...sticContext, and NestedDiagnosticContext to add additional context to your output.
Use "variable" in your config file to simplify. For example, you might define variables for your layouts and then reference the variable in the target configuration rather than specify the layout directly.
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