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QUESTION
Assume I have a class with three lists as follows:
...ANSWER
Answered 2021-Jun-16 at 03:33If you'd like to create a method in your class I suggest you can use the following.
QUESTION
I was making a simple to do app with mvc pattern and I saw an article which said you shouldn't pass the model values directly to the view, which made the project more complex than I thought (I am relatively new to programming and this is the first time I am trying out a design pattern).
But then later on I talked to someone who said that that is not true and you can send the model data directly to view, he didn't even use classes or some kind of grouping to separate the function he just put them in separate files.
I was wondering if there is a guideline that I couldn't find or we can do whatever we want as long as they are kind of separated. I would love an article or a guide to read up on as well.
...ANSWER
Answered 2021-Jun-16 at 01:01Since, I am not 100% sure the context in which you are trying to apply the MVC pattern, a good generic explanation of MVC can be found in GoF's 1995 book, Design Patterns: Elements of Reusable Object Oriented Software.
In the book, they state the following.
The Model is the application object, the View is its screen presentation, and the Controller defines the way the user interface reacts to user input.
A more robust explanation can be found from Martin Fowler where he also makes the case for a variation of Model View Controller that uses a Presentation Model.
If you are referring to Spring MVC then there is some magic that blurs the lines a bit. But in general, you have a controller that represents some screen or an encapsulated piece of functionality that the user (web requests) interact with. The controller serves up responses that are derived from the domain, usually via a Spring Service (i.e. @Service). The domain (Model) doesn't know anything about the View and the View may or may not know anything about the domain.
Given that, the View should be derived from the Model. But that's not always the case since sometimes how we present things to a screen is not the best logical way to model things in our domain - not to mention, the domain should be presentation agnostic. This leads into Fowler's argument for a Presentation Model, which is a model that belongs to the Presentation.
I call this a Presentation Model because it's a model that is really designed for and thus part of the presentation layer.
Microsoft took that idea and ran with it in a variant of MVC called MVVM (Model View ViewModel).
You can read more about that in Microsoft's documentation on ASP.Net Core.
So, back to your original question of "Should you pass the model directly to the view?" If you are using MVC then the controller is what provides the interaction. But if you're really asking, "Can you bind your view directly to the model?" If your model has all the stuff you need organized how your view needs it, then sure. And if it's simple enough, maybe that's the way to go. Otherwise, you could go with something like a Presentation Model or MVVM.
QUESTION
Can someone help me investigate why my Chainlink requests aren't getting fulfilled. They get fulfilled in my tests (see hardhat test etherscan events(https://kovan.etherscan.io/address/0x8Ae71A5a6c73dc87e0B9Da426c1b3B145a6F0d12#events). But they don't get fulfilled when I make them from my react app (see react app contract's etherscan events https://kovan.etherscan.io/address/0x6da2256a13fd36a884eb14185e756e89ffa695f8#events).
Same contracts (different addresses), same function call.
Updates:
Here's the code I use to call them in my tests
...ANSWER
Answered 2021-Jun-16 at 00:09Remove your agreement vars in MinimalClone.sol
, and either have the user input them as args in your init()
method or hardcode them into the request like this:
QUESTION
I have this code which prints multiple tables
...ANSWER
Answered 2021-Jun-15 at 20:59So, this is a good opportunity to use purrr::map
. You are half way there by applying code to one dataframe.
You can take the code that you have written above and put it into a function.
QUESTION
I have a project(A) is a normal winform and another project(B) is a vsto addsin for word project screenshot my VSTO adds-in references parts of project B when i make an installation and try to install it the installation gives me an error. error message things i have tried is made a installation for project A and installed it first then tried to install Project B but it gives the same error.
...ANSWER
Answered 2021-Jun-14 at 08:53You have to add files from the project A manually to the add-in installer. For your reference, a similar issue is described on the Error deploying ClickOnce application - Reference in the manifest does not match the identity of the downloaded assembly thread.
For VSTO based add-in, make sure that you did all the steps described in the Deploy an Office solution by using ClickOnce article.
QUESTION
I have a list (dput() below) that has 4 datasets.I also have a variable called 'u' with 4 characters. I have made a video here which explains what I want and a spreadsheet is here.
The spreadsheet is not exactly how my data looks like but i am using it just as an example. My original list has 4 datasets but the spreadsheet has 3 datasets.
Essentially i have some characters(A,B,C,D) and i want to find the proportions of times each character occurs in each column of 3 groups of datasets.(Check video, its hard to explain by typing it out)
...ANSWER
Answered 2021-Jun-09 at 19:00We can loop over the list
'l' with lapply
, then get the table
for each of the columns by looping over the columns with sapply
after converting the column to factor
with levels
specified as 'u', get the proportions
, t
ranspose, convert to data.frame
(as.data.frame
), split by row (asplit
- MARGIN = 1), then use transpose
from purrr
to change the structure so that each column from all the list
elements will be blocked as a single unit, bind them with bind_rows
QUESTION
I am trying to check if latitude
and longitude
exist in my SQL database, as currently when they are undefined, it leaves my web app blank on load with the following error TypeError: Cannot read property 'latitude' of undefined
My code was originally
...ANSWER
Answered 2021-Jun-15 at 18:36Looking at error TypeError: Cannot read property 'latitude' of undefined
. My guess is value of device.deviceData
is undefined
.
So,Please do verify with console.log(device)
if deviceData field exists in device.
And, to fix above issue you can try
QUESTION
Im having a problem on how to stop the countdown that i made in javascript. Can you please help me. here is my code:
...ANSWER
Answered 2021-Jun-15 at 17:31Check if the gap between the two dates is smaller or equal to 0. If so, you can stop the interval with clearInterval()
:
QUESTION
In tkinter I have made a notepad and also added a scrollbar to this notepad. The problem is when I click on the scrollbar (not using any arrow keys nor mouse scroll wheel)
I have tried google but I'm not the best at finding the right websites.
Heres the code to the notepad
...ANSWER
Answered 2021-Jun-15 at 17:13In your code, you aren't using the Listbox
. So, I suggest to remove that part completely and do this.
QUESTION
I'm making a POC with Lumen and Vue.JS. For now it just has to send a "hello world" message from the Lumen back-end to the Vue.JS front-end (which works). I have made an event which is triggered upon loading the page like this:
...ANSWER
Answered 2021-Jun-15 at 16:42Fix composer.json
I have created an issue on the PHP package: https://github.com/pusher/pusher-http-php/issues/295
It is true this version is broken, but the fix should be in the composer.json
file. Mine looked like this:
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