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I am new to flutter/dart coding, please help me solve the following: Here is my code trying to fetch data from ... -null-safety-in-simple-flutter-dart-code-with-object-snapshot-da...

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postgresql - Rails PG::UniqueViolation: ERROR: duplicate key value violates unique constraint "table_pkey"

I created something like a JSON backup for my project's database, and then I populate it like ... /rails-pguniqueviolation-error-duplicate-key-value-violates-unique-constraint...

asked Mar 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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I can't avoid the "Incorrect use of ParentDataWidget" error. The code below works - I want to be able to ... 65886838/how-do-i-get-rid-of-incorrect-use-of-parentdatawidget-error...

asked Mar 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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I'm trying to work with class-transformer and NestJS. I'm building an API based on Mongoose ... .com/questions/65647447/nestjs-problem-with-classserializerinterceptor-in-graphql...

asked Mar 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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So I want to have authentication via HTTP Basic Auth --and-- authentication which accepts a username / ... /65910628/using-both-regular-authentication-and-http-basic-authentication...

asked Mar 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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I am trying to create a simple Algorithm in Dart but I think the programming language doesn't matter it is ... .com/questions/65847415/algorithm-for-number-series-row-and-column...

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pyspark - Why driver memory is not in my Spark context configuration?

When I run the following command: spark-submit --name "My app" --master "local[*]" --py-files main ... questions/65873182/why-driver-memory-is-not-in-my-spark-context-configuration...

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amazon web services - How to configure secure deployment environment on aws and deploy angular and spring boot application

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sqlite - Count Persons in tree of Groups with a single query

I'm writing a query in SQLite, for Android, with a schema like this (extremely simplified here, just the fields I ... /65898084/count-persons-in-tree-of-groups-with-a-single-query...

asked Mar 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - How to make textbox input in selenium with xpath

I made script that automatically picks a product from kith.com and go to the checkout: element3 = driver. ... /65836971/how-to-make-textbox-input-in-selenium-with-xpath...

asked Mar 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - How to do template matching corrctly on the 7-Segments images?

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asked Mar 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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laravel - Route keep asking for parameter even if not set to receive any

I'm new to laravel and I'm having trouble with one of my web routes... I grouped some routes with the auth ... /route-keep-asking-for-parameter-even-if-not-set-to-receive-any...

asked Mar 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - Render Marker at certain interval

In context to my previous question, I'm looking at rendering marker on map at certain intervals, like ... //stackoverflow.com/questions/65662249/render-marker-at-certain-interval...

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java - A Maven plugin fails and to open an issue, I would like to explain inside how the NullPointerException encountered can appear

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assembly - Expand the lower two 32-bit floats of an xmm register to the whole xmm register

What is the most efficient way in Intel x86 assembly to do the following operation (a, b are 32-bit floats): From ... -32-bit-floats-of-an-xmm-register-to-the-whole-xmm-register...

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java - Direct Recursion vs While Loop for time complexity performance

I was wondering how time complexity compares between these two methods. I have written the first findEmpty ... /direct-recursion-vs-while-loop-for-time-complexity-performance...

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python - Why does this code display the error message "Error. please enter numeric input" only after entering both values of hours and rate

I want that code to diaplay this message "Error. please enter numeric input" just after entering Hours in ... -code-display-the-error-message-error-please-enter-numeric-input...

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java - Critical section controller accessed by 10 threads at same time

I have single thread group A with 100 users that run the following logic: *REQUEST1 *REQUEST2 * ... -section-controller-accessed-by-10-threads-at-same-time...

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delphi - How to make a form align to the edge of the screen like the taskbar?

I'm building a "dashboard" application which is always visible along any edge of any given monitor, even when other ... -how-do-you-make-a-form-stay-above-all-other-applications...

asked Mar 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - The parameters dictionary contains a null entry for parameter 'wantedids' of non-nullable type 'System.Int32' for method 'System.Web.Mvc.JsonResult'

In console showed me an error that parameters dictionary contains a null entry fo parameter wantedids, So I ... dictionary-contains-a-null-entry-for-parameter-wantedids-of-non...

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python - How to get the minimum and maxmum number from a series of numbers?

I'm having a hard time cropping the image by using python. I have a series of numbers that represent x,y ... to-get-the-minimum-and-maxmum-number-from-a-series-of-numbers...

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How to generate the "create table" sql statement for an existing table in postgreSQL

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sql - How To Select All Rows In A Table By Querying Data In Another Table

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asked Mar 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - How to mutate list permanently?

def deep_reverse(L) : for i in range (len(L)-1,-1,-1): L=L[::-1] for i in range (len ... . question from:https://stackoverflow.com/questions/65928411/how-to-mutate-list-permanently...

asked Mar 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Multithreaded Singleton

I have read about many possible ways to create a singleton for the multithreaded environment in Java, ... from:https://stackoverflow.com/questions/65882352/multithreaded-singleton...

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c# - VisualStudio does not find namespace

Well, I'd like to use a class of a namespace in my Mainwindow.xaml Image As you see the ... https://stackoverflow.com/questions/65874149/visualstudio-does-not-find-namespace...

asked Mar 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pmml - r2pmml unable to convert R model

After the R version and package update late last year, r2pmml is unable to convert my R model into PMML. ... //stackoverflow.com/questions/65831208/r2pmml-unable-to-convert-r-model...

asked Mar 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Retrieve value from tuple by giving number or letter in Haskell

I am very new to Haskell and am trying to retrieve 'a' if I give 0, 'b' if I give 1 and so ... /questions/65904330/retrieve-value-from-tuple-by-giving-number-or-letter-in-haskell...

asked Mar 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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