quizzes | simple Rails 3 app for the Programming in Ruby course | Learning library

So i'm on a project which is a quiz website for french medical student and I'm using Wordpress to develop it. I'm having trouble with something : I want, through a function, to display a value on the home page. This value is how many quizzes are available. To do that, I know that in my database I have a list of my quizzes which are sort by an id. You probably guessed that I want to use the list ID to know the number of quizzes.

To summarize :

• I need to select the last id from a row in a table from a database
• To integrate that value in a function
• Function that I will transform in shortcode for elementory

My problem : I tried a lot of things but nothing work, I searched during hours and the "final" code that I have is that :

I was trying to fetch data from the Firestore and show it in a RecyclerView. But, I am getting the following errors. I do not have much experience in coding, but I tried to add RecyclerView and fragments in my project.

I am using Kotlin as language.

I have been trying to figure out what went wrong and for a solution for the last three days but now I think I must seek help from experts like you.

Following is the error I get in the Logcat

I'm trying to write my gradebook in sqlite. Suppose my gradebook looks like this:

I am trying to get all the data from mongodb but it shows [object] [object] how do I get array data to angular from mongodb? Here is my code:

How can I convert userIDs to usernames of these users when sending data from db? I think it's possible using middlewares, but I don't know how to do it. There is my route

I created quizzes in r/exams that contain "num" and "string" Answer fields which I am using in Moodle. I would like to give negative points (e.g. -0.25% of the possible points for that answer) for incorrect answers. In theory there are functions in r/exams that allow this (exams_eval), but for me they only work in choice questions, not in numeric questions.

I also tried different "rule" settings and variations of the r/exams command but did not got it working. Are negative points not possible for numeric exams?

R/exams Command:

Motivation: I want to write an interface that uses questions from the R package exams in learnr questions/quizzes. In R/exams each question is either an R/Markdown (Rmd) or R/LaTeX (Rnw) file with a certain structure specifying question, solution, and further meta-information. The questions can contain R code to make them dynamic, e.g., sampling numbers or certain text building blocks etc. Hence, the workflow is that first the questions are run through knitr::knit or utils::Sweave and then embedded in a suitable output format.

Problem: When I rmarkdown::run("learnr+rexams.Rmd") a learnr tutorial that dynamically produces a question or quiz from an Rmd exercise I get the error:

Error in if (grepl(not_valid_char_regex, label)) { : argument is of length zero

The code for a simple reproducible example learnr+rexams.Rmd is included below. The reason for the error appears to be that learnr runs a function verify_tutorial_chunk_label() that tries to assure the the learnr R chunk labels are well formatted. However, confusion is caused by the chunks that are run by the R/exams package, unnecessarily leading to the error above.

Workarounds: I can disable the verify_tutorial_chunk_label() in the learnr namespace and then everything works well. Or I can use Rnw instead of Rmd exercises and then learnr does not conflict with Sweave(). Also, when I run my code outside of a learnr tutorial it works fine.

Question: Can I do anything less invasive to make exams cooperate with learnr? For example, setting some appropriate knitr options or something like that?

Example: This is the source for the minimal learnr tutorial learnr+rexams.Rmd that replicates the problem. Note that everything is very much simplified and only works for certain R/exams exercises, here using the function exercise template that ships with R/exams.

I have 3 collections

Quizzes

I am trying to get the average of multiple columns in my SQL database. This will be used to aggregate the average score of my student's attempts on various quizzes. This is the query I am using right now: