## blockchain – i'm trying to call a smart solidity contract method via an angular app. but i can't call the method. this is the error i get in the console

I am trying to call a smart contract strength method via an angular app. but i can't call the method. can someone please help me. this is the error i get in the console

``````TypeError: this.contract.methods.hello is not a function
at CertificateContractService. (certificate-contract.service.ts:32)
at Generator.next ()
at fulfilled (tslib.es6.js:70)
at ZoneDelegate.invoke (zone-evergreen.js:359)
at Object.onInvoke (core.js:39699)
at ZoneDelegate.invoke (zone-evergreen.js:358)
at Zone.run (zone-evergreen.js:124)
at zone-evergreen.js:855
``````

## Smart contract

``````
contract CertificateList {

function hello() external pure returns (string memory )  {
return "Hello";
}

}
``````

## Angular service

``````import Web3 from 'web3';
import {WEB3} from './WEB3';

declare let require: any;
declare let window: any;

@Injectable({
providedIn: 'root'
})
export class CertificateContractService {
private abi: any;
private contract;
private accounts: string();

constructor(@Inject(WEB3) private web3: Web3) {
this.init().then(res => {
}).catch(err => {
console.error(err);
});
}

private async init() {
this.abi = require('../assets/abi/CertificateList.json');
// await this.web3.currentProvider.enable();
this.accounts = await this.web3.eth.getAccounts();

this.contract = new this.web3.eth.Contract(this.abi, this.address, {gas: 1000000, gasPrice: '10000000000000'});

this.contract.methods.hello().send()
.then(receipt => {
console.log(receipt);
}).catch(err => {
console.error(err);
});
}
}
``````

## Provider

``````import { InjectionToken } from '@angular/core';
import Web3 from 'web3';

export const WEB3 = new InjectionToken('web3', {
providedIn: 'root',
factory: () => {
try {
window('ethereum').autoRefreshOnNetworkChange = false;
const provider = ('ethereum' in window) ? window('ethereum') : Web3('givenProvider');
return new Web3(provider);
} catch (err) {
throw new Error('Non-Ethereum browser detected. You should consider trying Mist or MetaMask!');
}
}
});
``````

## php – How to get data from a table and distribute it in a method?

I want to create a recording method as follows:

On the product page:

``````require_once('metodos/metodosClass.php');
\$metodos = new metodosClass();
....
\$tabela = 'produtos';
\$camposTB = array('Nome,Descricao,Valor,ValorDesconto');
\$valores = array_filter(\$_POST);
``````

But how could I get the values ​​of the variables \$ fieldsTB and \$ values and distribute within the method Register Products ()?

``````public function cadastrarProdutos(\$tabela, array \$camposTB, array \$valores)
{
mysqli_query(\$this->conexao,"INSERT INTO ".\$tabela." ("{INCLUIR OS VALORES DA VARIÁVEL \$camposTB}") VALUES("{INCLUIR OS VALORES DA VARIÁVEL \$valores}")");
``````

## magento2.3.3 – Magento 2.3.3: How to replace the Collect method in Magento Catalog Ui DataProvider Product Listing Collector Image

I have created a recently viewed product widget in the sidebar of the backend category page. I have a single store with multiple currency configurations when I see that the product is perfectly added to the list.

My problem is that when I change the currency, the image is deleted. Again, I need to see this product to sort out this problem. So I need to bypass the file below to fix the problem.

I need to replace the file below

Magento Catalog Ui DataProvider Product Listing Collector Image

I tried to use Preference but unfortunately it does not work.

\$ this-> imageCodes returns an empty array. The value of this is defined in

module-catalog / etc / di.xml.

around the line 992

Could someone suggest a way around this class.

So far, what I have done is

app / code / Vendor / Module / etc / di.xml

``````
``````

Then, app / code / Vendor / Module / Plugin / Ui / DataProvider / Product / Listing / Collector / Image.php

``````design->getDesignTheme();
print_r(\$this->imageCodes);die;
foreach (\$this->imageCodes as \$imageCode) {
/** @var ImageInterface \$image */
\$image = \$this->imageRenderInfoFactory->create();
/** @var MagentoCatalogHelperImage \$helper */
\$helper = \$this->state
->emulateAreaCode(
'frontend',
(\$this, "emulateImageCreating"),
(\$product, \$imageCode, (int) \$productRender->getStoreId(), \$image)
);

try {
\$resizedInfo = \$helper->getResizedImageInfo();
\$resizedInfo = (\$helper->getWidth(), \$helper->getHeight());
}

\$image->setCode(\$imageCode);
\$image->setHeight(\$helper->getHeight());
\$image->setWidth(\$helper->getWidth());
\$image->setLabel(\$helper->getLabel());
\$image->setResizedHeight(\$resizedInfo(1));
\$image->setResizedWidth(\$resizedInfo(0));

\$images() = \$image;
}

\$this->design->setDesignTheme(\$currentTheme);
\$productRender->setImages(\$images);
}

/**
* Callback for emulating image creation
*
* Callback in which we emulate initialize default design theme, depends on current store, be settings store id
* from render info
*
* @param ProductInterface \$product
* @param string \$imageCode
* @param int \$storeId
* @param ImageInterface \$image
* @return MagentoCatalogHelperImage
*/
public function emulateImageCreating(ProductInterface \$product, \$imageCode, \$storeId, ImageInterface \$image)
{
\$this->storeManager->setCurrentStore(\$storeId);

\$imageHelper = \$this->imageFactory->create();
\$imageHelper->init(\$product, \$imageCode);
\$image->setUrl(\$imageHelper->getUrl());
return \$imageHelper;
}
}
``````

Help kindly !!!

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## statistics – Limit difference – Delta vs. method Slutsky

Let $$(X, Y)$$ be normal bivariate distributed and
$$S_X ^ 2 = sum_i (X_i – bar {X}) ^ 2 \ S_Y ^ 2 = sum_i (Y_i – bar {Y}) ^ 2.$$
Now i want to derive the limit of
$$T_n: = left ( sqrt {n} left ( frac { bar {X}} {S_X} – frac { mu_X} { sigma_X} right), sqrt {n} left ( frac { bar {Y}} {S_Y} – frac { mu_X} { sigma_Y} right) right).$$
then
$$lim_ {n to infty} T_n = N (0, Sigma).$$
The multivariate delta method would tell me that
$$Sigma = begin {pmatrix} 1 + frac { mu_X ^ 2} {2 sigma_X ^ 2} & rho + frac { rho ^ 2 mu_X mu_Y} {2 sigma_Y sigma_X} \ rho + frac { rho ^ 2 mu_X mu_Y} {2 sigma_Y sigma_X} & 1 + frac { mu_Y ^ 2} {2 sigma_Y ^ 2} end {pmatrix}$$
while I would expect Slutsky's theorem
$$Sigma = begin {pmatrix} 1 & rho \ rho & 1 end {pmatrix}.$$

Where is the error in my thinking?

## design – How to avoid changing dozens of classes and interfaces when adding an argument to a method used in dozens of classes and interfaces?

On several occasions, I have been faced with the following design problem that I don't know how to solve. Imagine, for example, an application that at some point receives a JSON object from an API. Before you can use this object, the application must perform several transformations: for example, a transformation can convert dates from one format to another, and another transformation can add additional data from the cache ( as an entity describing a user, based on a unique user ID from the original object).

In order to be able to choose the transformations to be applied at runtime, the transformations are defined in specific classes, such as `DateFormatTransform` and `ExtraDataFromCacheTransform`.

Basically, the code that performs the transformation would be like this:

``````foreach (var transform in this.GetRelevantTransforms())
{
entity = transform.Apply(entity);
}
``````

`this.GetRelevantTransforms` would return an instance of `DateFormatTransform`, `ExtraDataFromCacheTransform` and other classes. Each of these classes implements an interface containing the method:

``````SampleEntity Apply(SampleEntity x)
``````

Later, additional needs may arise, requiring to change the signature `Apply`. For example, you may need transformations to know the current user, because depending on the user, some transformations can be performed differently:

``````SampleEntity Apply(SampleEntity x, User currentUser)
``````

The problem is that in the meantime, I can have a few dozen transformations, and such a basic modification would require browsing through these dozens of files, changing both the interface (like `IDateFormatTransform`) and class (as `DateFormatTransform`).

I guess having to change around fifty files just to add a single argument is not a sign of a clean code base.

What are the alternatives?

Should I use a DTO, such as `TransformArguments`, which would always be the only parameter of `Apply` method? Or are there other techniques?

Or is my approach with a set of transformations flawed from the beginning, and if so, how can I fix it?

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## shipping – Magento2: payment method for a page

By default, guest payment in Magento is enabled and visitors can place an order without registering on the website. Some websites require a mandatory login to place orders, and this default feature must be disabled to prohibit the payment of guests.

## How to return a query from one method to another in PHP Laravel?

I need to pass a query that is in a method to another method that receives it, you probably think about it:

``````public function query(\$document)
{
\$query = Tabla::select('*')->where('codemp', '=', \$document)->first();
return \$query
}

public function recibe()
{
\$consulta = \$this->query();
dd(\$consulta);
}
``````

The above is an example, this is not my query, the query that I have is very extensive and it is not worth showing it for the solution I need. Well, the detail here is that as the previous query does not work because the method first () laravel transforms the request into an object, and the return try to return a string because it hosts an error saying that an object can not be returned, and then try to convert the request to a JSON and return it to the other method as json but as json, i can not browse it for function which is already set to send data to a PDF.

In conclusion, what I need is to return this request with first () to browse later each extracted field as:

``````\$query->id;
``````

I appreciate help in advance …

## c # – How to refactor a typical DataAccess layer method with the ADO.NET model in SqlReader mappings

Here is an example of a method that I intend to refactor:

`````` public CustomReturn < List < ParkingSlipDetails >> GetAllParkingSlips(int offset, int fetch)
{
SqlConnection sqlConnection = null;
try
{
List < ParkingSlipDetails > ParkingSlipDetailsList = new List < ParkingSlipDetails > ();
sqlConnection = (SqlConnection) sqlHelper.CreateConnection(); //sqlHelper is a nugget and not in my control
sqlConnection.Open();
SqlCommand cmd = new SqlCommand(Constants.GetAllParkingSlips, sqlConnection);
cmd.CommandType = System.Data.CommandType.StoredProcedure;
if (sqlDr != null)
{
{
ParkingSlipDetails ParkingSlipDetails = new ParkingSlipDetails();
ParkingSlipDetails.CreatedBy = gepservice.GetUserContext().UserId;
}
}
return new CustomReturn < List < ParkingSlipDetails >> (ParkingSlipDetailsList);
}
catch(Exception ex)
{
LogError("ManageParkingSlipDataAccess", "GetAllParkingSlips", "Error", ex);
return null
}
finally
{
if (sqlConnection != null)
sqlConnection.Close();
}
}
``````

I think there is plenty of room for refactoring here as there are many places where I would repeat:

``````sqlConnection = (SqlConnection)sqlHelper.CreateConnection();
sqlConnection.Open();
``````

and

``````var refCountdr = (RefCountingDataReader) sqlHelper.ExecuteReader(cmd);