Meow | MongoDB object persistence for Swift | Database library
kandi X-RAY | Meow Summary
kandi X-RAY | Meow Summary
Meow is a boilerplate-free object persistence framework for Swift and MongoDB, from the creators of MongoKitten. It manages your database for you, so you can focus on writing your application.
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of Meow
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Meow Examples and Code Snippets
Lines of Code : 21License : Permissive (MIT)
Copyfinal class User: Model {
var _id = ObjectId()
...
}
// Stores the username in _id
final class User: Model {
var _id: String
var username: String {
return _id
}
...
final class User: Model {
// Changes the collection name final class Article: Model {
var _id = ObjectId()
let creator: Reference
var title: String
var text: String
...
let resolvedUser = article.creator.resolve(in: context)
let database: MongoKitten.Database = context.manager.database
private void meow() {
System.out.println("Meow!");
} public void meow() {
LOGGER.info("meow");
} Community Discussions
Trending Discussions on Meow
QUESTION
In this challenge, using javaScript you will create 3 classes
- Super class called
Animal. DogandCatclass which both extendsAnimalclass (a dog is an animal and a cat is an animal)DogandCatclass should only have 1 function, which is their own implementation of thesound()function. This is polymorphism- a
Homeclass. But we’ll talk about that later
ANSWER
Answered 2021-Jun-05 at 13:48Since 2015 there should be no more need to go through the pain of assigning prototype properties like that, and establish inheritance between two classes with such assignments.
I would suggest rewriting your code completely, and using the class syntax, where you don't need to explicitly do this inheritance fiddling with the prototype property:
QUESTION
I am trying to get the instance of a ReactElement Component.
I have the following (example) code:
...ANSWER
Answered 2021-Jun-10 at 05:25You can use Context's to register the child component:
QUESTION
Suppose I have the following type definitions:
...ANSWER
Answered 2021-Jun-04 at 00:33An interface holds two things: a pointer to the underlying data, and the type of that data. So, when you declare
QUESTION
I need to update the primary key of a indexed record which I am reading it sequentially i know that i cannot use rewrite to do that, Any suggestion
The first 5 move statement is primary key.
...ANSWER
Answered 2021-Jun-01 at 22:51As you've seen there is no REWRITE of the primary index, because as soon as you change that the REWRITE is not changing the previous read record but the one with the new primary record - if it exists.
This is how ORGANIZATION INDEXED works.
The thing that is commonly done:
READold-record (possiblyWITH LOCK)- if you don't have that already: save the old values of the key fields
- place the new values in the key fields, then
WRITE, ideally with anINVALID KEYclause to catch this case - result is one of:
INVALID KEYcondition (= duplicate): - you have to decide if that should beDELETED(if yes, then re-read the old record again, "update" its key field and do theINSERTagain, otherwise abort either with a manual error message or by letting the runtime system handle the duplicate key)NOT INVALID KEYcondition - everything is fine
- place the saved (old) value in the key fields, then
DELETE(as you'd otherwise have the record in the file with both the old and the new key values)
Depending on the rules in your environment you may need to READ with the new key and therefore don't ever get into the INVALID KEY condition during WRITE.
QUESTION
I'm not looking for code samples. I want to state my understanding of Box vs. Rc and have you tell me if my understanding is right or wrong.
Let's say I have some trait ChattyAnimal and a struct Cat that implements this trait, e.g.
ANSWER
Answered 2021-May-29 at 23:00Yes, all this is correct.
There's a second reason for this design: it allows the compiler to verify that the operations you're performing on the vector elements are using memory in a safe way, relative to how they're stored.
For example, if you had a method on ChattyAnimal that mutates the animal (i.e. takes a &mut self argument), you could call that method on elements of a Vec> as long as you had a mutable reference to the vector; the Rust compiler would know that there could only be one reference to the ChattyAnimal in question (because the only reference is inside the Box, which is inside the Vec, and you have a mutable reference to the Vec so there can't be any other references to it). If you tried to write the same code with a Vec>, the compiler would complain; it wouldn't be able to completely eliminate the possibility that your code might be mutating the animal at the same time as the code that called it was in the middle of trying to read the animal, which might lead to some inconsistencies in the calling code.
As a consequence, the compiler needs to know that all the elements of the Vec have their memory treated in the same way, so that it can check to make sure that a reference to some arbitrary element of the Vec is being used appropriately.
(There's a third reason, too, which is performance; because the compiler knows that this is a "vector of Boxes" or "vector of Rcs", it can generate code that assumes a particular storage mechanism. For example, if you have a vector of Rcs, and clone one of the elements, the machine code that the compiler generates will work simply by going to the memory address listed in the vector and adding 1 to the reference count stored there – there's no need for any extra levels of indirection. If the vector were allowed to mix different allocation schemes, the generated code would have to be a lot more complex, because it wouldn't be able to assume things like "there is a reference count", and would instead need to (at runtime) find the appropriate piece of code for dealing with the memory allocation scheme in use, and then run it; that would be much slower.)
QUESTION
I'm new to Rust and a frequent user of MongoDB. I usually use node.js + Mongoose ODM.
Is there any MongoDB ODM in RUST that implements a custom schema and business logic hooks like Mongoose ODM ? Or do I need to implement it myself inside the Rust's type system?
This is an example from Mongoose
...ANSWER
Answered 2021-Mar-16 at 15:56You may not need an ODM. With serde (which is used by all those ODMs), the "schema" is implemented on the struct itself, so you can add any methods you want with an impl block. It would look something like this:
QUESTION
I have a list of Keywords
...ANSWER
Answered 2021-May-25 at 15:03No need to use a regex when Python's standard in operator will do the job, IMO:
QUESTION
Suppose I have these classes
...ANSWER
Answered 2021-May-24 at 21:40ClassType should be declared as
QUESTION
I am testing my object oriented programming file:
...ANSWER
Answered 2021-May-15 at 14:40The first argument of passed to init is always implicitly the constructed instance. You should handle this in the definition too:
QUESTION
I have a MS SQL table that has a message field containing a string with key value pairs in comma delimited format. Example:
id date message 1 11-5-2021 species=cat,color=black,says=meowI need to read the data from tables message field and insert it into a table where keys are column names.
Format of the strings:
species=cat,color=black,says=meow
And this should be transformed into table as follows:
species color says cat black meowThe order of key value pairs is not fixed in the message. Message can also contain additional keys that should be ignored.
How can I achieve this using MS SQL?
...ANSWER
Answered 2021-May-11 at 11:16You can use string_split() and some string operations:
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