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I'm learning flutter from the older version with the new one. so, I have many times problem with null safety.

I have code in database.dart file like this :

I was given the task to create an NYC Guide project out of Python and Django. I am iterating through a nested dictionary to render boroughs, activities, and venues. The home page lists a handful of boroughs. The boroughs page lists a handful of activities in each borough. The activities page lists a handful of venues to select. My issue is when I click on one of the activities I receive a TracebackError. I am trying to at least render the venues page that has a simple 'VENUES PAGE' on it. I'd love any advice or feedback. This is my first Django project so forgive me if I didn't explain this thoroughly enough. Feel free to ask for further explanation! What I am ultimately trying to do is render an unordered list of venues for each activity in the activities page. I would like each li to be a url that takes me to the venue.html page. It doesn't have to render a specific venue. I can take it from there. I am stuck on this one step. I have already successfully rendered the borough and activities pages, and I have been able to loop through the activities, but when I click on a specific activity I get this error:

"TypeError at /brooklyn/beaches activity() missing 1 required positional argument: 'venues'"

I have a donation dataset with a field in it called "Description", where the donor described what they gave their gift for. This field has multiple words or strings in it (sometimes a full sentence), and several rows list specific counties where they wanted their donation to be designated.

I would like to identify which rows in this field have a county name in them, and indicate that somehow in a new field. I have a dataframe with the county names from the two states I need, but I'm struggling to know which code let me use the county field in the county dataframe as a basis for identifying county names in within the Description field.

I'm still at a low level in R but I'll try to give some sample code. I have over 1000 rows so it will take too long for me to search for specific counties in a string - it will be more helpful to use a list of counties as my basis for searching.

I am currently in the middle of migrating all of my out of date code to the newest version of firebase and when I updated the firebase dependency it gave me the error that the method 'setData' isn't defined for the type 'documentreference'.

I'm trying to generate markers using an api. Right now I can get the api fine and I have it stored in a variable but I just can't get the markers to show up. I'm using a v-for loop to display all of the markers.

any help would be appreciated

heres my code

I'm making in app using vue and leaflet and I need to generate markers from and API. But for some reason, only the default markers are showing. I can access the api data in the DOM. I just can't figure out how to iterate over it and show the data on the DOM. pls help

here's the code

I'm building a vue and leaflet application and I keep getting this error.

[Vue warn]: Property or method "markers" is not defined on the instance but referenced during render.

I can't find the problem, both the names in the variable and the code are spelled correctly and they are all in the same component.

(note: this is not a duplicate of [Vue warn]: Property or method is not defined on the instance but referenced during render as mine is in a single file component and also the answers there didn't help me)

here is my code

I'm trying to get documents in brews collection from firestore database.

I wrote code like below but it's getting empty array.

What is wrong with my code?

Help me somebody who is used to flutter and firebase.

I'm trying to install sshfs command on my Mac OS Catalina 10.15.7, but I got brew error "sshfs: no bottle available!"

Then I use brew cat sshfs to show the source, and here's the output: