sequenced | Generate scoped sequential IDs for ActiveRecord models | Application Framework library
kandi X-RAY | sequenced Summary
kandi X-RAY | sequenced Summary
Sequenced is a simple gem that generates scoped sequential IDs for ActiveRecord models. This gem provides an acts_as_sequenced macro that automatically assigns a unique, sequential ID to each record. The sequential ID is not a replacement for the database primary key, but rather adds another way to retrieve the object without exposing the primary key.
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Top functions reviewed by kandi - BETA
- Returns true if the record matches the given id
- Find the last record
- Sets the id for this record .
- Returns the next_id for the given record .
- Sets up a new database .
- Returns true if the database is a valid database .
- Checks if the given ID is set .
- Returns true if this record should be run .
- Get the root of this class
- Returns the maximum number of values .
sequenced Key Features
sequenced Examples and Code Snippets
Community Discussions
Trending Discussions on sequenced
QUESTION
I have a situation where my code needs to make one network call to fetch a bunch of items, but while waiting for those to come down, another network call might fetch an update to those items. I'd love to be able to enqueue those secondary results until the first one has finished. Is there a way to accomplish that with Combine?
Importantly, I am not able to wait before making the second request. It’s actually a connection to a websocket that gets made at the same time as the first request, and the updates come over the websocket outside of my control.
UpdateAfter examining Matt’s thorough book on Combine, I settled on .prepend()
. But as Matt warned me in the comments, .prepend()
doesn’t even subscribe to the other publisher until after the first one completes. This means I miss any signals sent prior to that. What I need is a Subject
that enqueues values, but perhaps that’s not so hard to make. Anyway, this is where I got:
Initially I was going to use .append()
, but I realized with .prepend()
I could avoid keeping a reference to one of the publishers. So here’s a simplified version of what I’ve got. There might be syntax errors in this, as I’ve whittled it down from my (employer’s) code.
There’s the ItemFeed
, which handles fetching a list of items and simultaneously handling item update events. The latter can arrive before the initial list of items, and thus must be sequenced via Combine to arrive after it. I attempt to do this by prepending the initial items source to the update PassthroughSubject
.
Below that is an XCTestCase
that simulates a lengthy initial item load, and adds an update before that load can complete. It attempts to subscribe to changes to the list of items, and tries to test that the first update is the initial 63 items, and the subsequent update is for 64 items (in this case, “update” results in adding an item).
Unfortunately, while the initial list is published, the update never arrives. I also tried removing the .output(at:)
operators, but the two sinks are only called once.
After the test case sets up the delayed “fetch,” and subscribes to changes in feed.items
, it calls feed.handleItemUpatedEvent
. This calls ItemFeed.updateItems.send(_:)
, but unfortunately that is lost to oblivion.
ANSWER
Answered 2021-Jun-06 at 08:06After a fair bit of trial and error, I found a solution. I created a custom Publisher and Subscription that immediately subscribes to its upstream publisher and begins enqueuing elements (up to some specifiable capacity). It then waits for a subscriber to come along, and provides that subscriber with all the values up until now, and then continues providing values. Here’s a marble diagram:
I then use this in conjunction with .prepend()
like so:
QUESTION
I want to trigger the self._runSequence()
func directly after start the timer. This is my code:
ANSWER
Answered 2021-Jun-04 at 12:33If I understood you correctly, you want the function
to be executed when the RepeatedTimer
is initialized, and then periodically, right?
Instead of calling start
in __init__
, call _run
. It calls start
and execute the function
.
QUESTION
I have data stored on the DB as gaps and islands and I need to join it with another table. the gaps and islands table like the below:
...ANSWER
Answered 2021-May-20 at 17:41I usually solve this kind of problem avoiding a non-equi-join:
QUESTION
Is
...ANSWER
Answered 2021-May-20 at 11:43No it isn't well-defined. Suppose we replace all sequence point in your code with pseudo code "SQ":
QUESTION
I'm trying to merge multiple sets of 2 fastq files from the same sequencing library. I have a txt file with all the sample names in it. The samples were sequenced in paired-end so there're both _1.fastq.gz and _2.fastq.gz files associated with each sample.
SRR_Acc_list.txt
SRR1
SRR2
SRR3
SRR4
...
The following code is what I'm trying to achieve: combining SRR1 and SRR2 for both read 1 and read 2 into one fastq files in the output folder combined_fastq.
...ANSWER
Answered 2021-May-18 at 22:04Like most folk on StackOverflow, I have no idea about bioinformatics, fastq or "paired-ends", however I can reproduce the pattern you seem to want:
QUESTION
I'm currently working over an app similar to good old Tamagotchi with modern twists. Right now I prepared some code and didn't need any character animations but now I'm stuck. I want to make a scaffold with title, line of buttons below it, yet still on top of the screen, second bunch on bottom and create some kind of interactivity inside between those two, with character made from assets, some animations and reactions on touch. To be clear - something like this:
...ANSWER
Answered 2021-Apr-21 at 21:51That tutorial is quite old, a lot has happened in the world of Flame since then.
I'm guessing you are using version 1.0.0-rc9
of Flame?
Something like this should work with the that version:
QUESTION
I am in a situation where I am forced to use a std::vector
container as my underlying data structure. I'm trying to exploit boost::multi_index::sequenced<>
to shadow the vector offset, and provide a mechanism for richer data queries. I really don't want to unnecessarily copy all the data from one container to another.
In the example code snippet below I have a class BarInterface
that manages the insertion and removal of elements to the Bar::foos
container. Initially I tried to store references to the vector elements as elements of the typedef boost::multi_index_container
, but these are not stable against insertions.
What I'd like to do is have a custom key extractor that is a function of the _bar
container and the boost::multi_index::sequenced<>
index. So, for example to get the name of an element, I'd find the sequence offset x
, and then _bar.foos[x].name
. So, I'm really just using boost::multi_index
as a proxy for richer queries against a vector of variable size.
ANSWER
Answered 2021-Apr-21 at 09:14This is extremely brittle and I wouldn't recommend going to production with such code, but since you asked for it:
QUESTION
I'm trying to get data from base58 combination by appending to the end of strings.
...ANSWER
Answered 2021-Mar-26 at 08:05# Final
As a result of long efforts, I got the result I wanted. This works flawlessly for me.
QUESTION
Hello dear colleagues,
First thing first, this is my first time I'm asking a question here so I hope I'll be clear.
I'm currently facing some challenges when dealing with a lot of dataframes with variable lengths and non-regular colnames. The challenge is to remove unwanted rows (here rows for samples sequenced as Whole genome shotgun sequencing) matching multiple keywords, indeed it would we to easy to have a single keyword ... For that purpose I'm unsing filter_all(any_vars(str_detect(., "WGS"))
. However, trying to negate the code with negate=T
or !str_detect()
return the whole dataframe and nothing seems to work. Using all_vars()
remove every rows in the df.
I came around a solution but I find it quite heavy and I'm pretty sure there is a better way to perform this :
ANSWER
Answered 2021-Mar-23 at 18:59Since you mentioned multiple keywords, you can pass multiple keywords to str_detect()
with the regex |
(or) operator.
The following lines will filter out (via negate = TRUE
all rows where at least one variable has at least one of the given patterns ui|Br|Ch|lis
.
QUESTION
In section except.ctor, the rule states:
- As control passes from the point where an exception is thrown to a handler, objects with automatic storage duration are destroyed by a process, specified in this subclause, called stack unwinding.
- [...]
- If the initialization or destruction of an object other than by delegating constructor is terminated by an exception, the destructor is invoked for each of the object's direct subobjects and, for a complete object, virtual base class subobjects, whose initialization has completed ([dcl.init]) and whose destructor has not yet begun execution, except that in the case of destruction, the variant members of a union-like class are not destroyed. [ Note: If such an object has a reference member that extends the lifetime of a temporary object, this ends the lifetime of the reference member, so the lifetime of the temporary object is effectively not extended. — end note ] The subobjects are destroyed in the reverse order of the completion of their construction. Such destruction is sequenced before entering a handler of the function-try-block of the constructor or destructor, if any.
According to bullet 3, which states can be also considered as a part of the process of stack unwinding. Since the first rule sounds like that the invocation of stack unwinding is only for the object with automatic storage duration. Doesn't that stack unwinding invoke for the object with dynamic storage duration or others duration?
...ANSWER
Answered 2021-Mar-18 at 02:24By the plain wording of [except.ctor]/3, it applies to objects with any storage duration, as long as they are subobjects of an object whose construction was terminated by an exception. This should not be controversial.
However, the wording of [except.ctor] has changed over time, and this seems to have created some issues which the OP has noticed. The background is that the wording used to be simliar to the current wording, with "stack unwinding" only referring to the destruction of automatic objects, and someone noticed that this created an inconsistency, where, when no matching handler is found, it is not guaranteed whether stack unwinding occurs, but it is guaranteed that subobject destruction occurs (since there is nothing in the text to say that it may not happen if a handler is not found). This was CWG 1774. CWG agreed that this inconsistency was undesirable (and perhaps it was unintentional, though that page doesn't say). So the wording was changed so that subobject destruction would be an aspect of "stack unwinding", and thus covered under [except.handle]/9, instead of being a separate process. But then later, to resolve a different DR that has nothing to do with exceptions, the old wording was added back, and I'm 90% sure that it was unintentional. The intent of the resolution to CWG2256 was just to avoid discrimination against trivially destructible objects, and not to actually change anything about exception handling.
Therefore, the current wording is defective, and the standard should still be read as if "stack unwinding" includes subobject destruction (i.e., the resolution to CWG 1774 stands). You might even be able to fix this editorially (i.e., submit a pull request against the standard source).
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