How can a json id and database table id be mapped in ruby on rails and the output of the result be shown on UI. I have a collection of entries in my database say for id, name, url, code, and on UI i have implemented a table whose values are from Json field. I need to fetch data from database for url and code on UI using map concepts in rails.
Example :
Json field : [position":"1","name":"Bitcoin","change24":"-2.59 %","currency":"usd","id":"btc"]. My database has url and id, where id is the same value as in json. All thats needed is to map the id in-order to get the corresponding url on UI.
So is this something you are going for?
#json_data.map! do |json_item|
db_item = #database_data.detect{|dbi| dbi['id']==json_item['id']}
json_item['url'] = db_item['url'] if db_item
end
Related
When I am calling API its giving data in [[101,4],[102,2],[103,1],[104,1],[105,1],[108,1],[109,1]] format which is only value. Is there any solution that how to get this data in UI in flutter?
Previously I have worked with below type of data coming from API.In this data can be accessed using key name but how to access value in [[101,4],[102,2],[103,1],[104,1],[105,1],[108,1],[109,1]] format when there is no key to access value in Flutter?
[{"activityId":101,"docId":90,"status":1},{"activityId":101,"docId":100,"status":0},{"activityId":101,"docId":159,"status":0},{"activityId":101,"docId":201,"status":0},{"activityId":1784,"docId":123,"status":1}]
This looks like basic List<List<int>> so if data is [[101,4],[102,2],[103,1],[104,1],[105,1],[108,1],[109,1]] let's say you want to access number 4 from the start of the message you'd need to access it like:
final response = <List<int>> [[101,4],[102,2],[103,1],[104,1],[105,1],[108,1],[109,1]]
int four = response[0][1];
print('$four')
in terminal would print value 4
Is it possible to get data from an api url and save it directly to database when working with laravel? the data i get from the url is of the format {"name":"100KVA SUKAM Generator","level":"5.965"}.
Yes, you can create table with json type field (or text) and keep data there:
$table->json('data_from_api');
https://laravel.com/docs/5.2/migrations#writing-migrations
If you want to persist data as usual data, you can use mass assignment. First, convert JSON to an array with [json_decode][1] and save data like that:
$data = json_decode($jsonData, true)
Model::create($data);
Don't forget to add all columns to a $fillable property of a model.
I can get the list of records I have of a custom content by creating a new "view" and setting the response returned in a JSON format
Now I would like to send a get request, with 1 or more parameters, and only return a subset of records whose fields match with my parameters
ex : www.exmample.com/rest/view/customcontent?city=paris
How could I do that ?
You can create a filter (add filter criteria) in the view. Make it exposed and change the Filter identifier field according what you want to have in the URL.
I am making a simple REST API in front of a NoSQL database that stores records as documents similar to JSON (but not exactly the same). Each record has some fields, including id for the database, and also including some derived fields, like dateCreated.
Any time I GET anything, I want to return the objects with all the fields.
// GET /users returns an array of these in JSON
// [{id:"xxx", name:"Bobby", dateCreated:"YYYY-MM-DD"]
data User = User { id :: String, name :: String, dateCreated :: XXX }
But any time I POST or PUT anything, they client should send an object with the id field and any derived fields missing. The database is responsible to create the id when I save it, and I would create some derived fields
// POST /users would need you to post only the name.
// {name:"Henry"}
data PartialUser = PartialUser { name :: String }
If resource represents objects of type User, what should I call the thing client is sending to me? Would you make all the derived fields Maybe values? Or would you create a second object called PostedUser or something?
It can be many things:
a request body
the representation of the intended resource state of the client
a command DTO which you can send to the domain logic in order to process it by CQRS
I would make it CreateUser command, but if you don't want to use CQRS and DDD, then you would probably call it as PartialUserRepresentation, or you don't create a data structure, just use the properties to create a new User entity. Ofc. if you use entities.
So I would say it depends on the architecture of your system.
I am designing a Web Application using Django Framework. I have written the model code, urls.py and view code which can be seen Here.
I have added some data into the database table. But when I try to access the object using the code below, it just shows bookInfo objects five times. I don't think I am successful enough in pulling the data from the database. Kindly help.
View
def showbooks(request):
booklist = bookInfo.objects.order_by('Name')[:10]
output = ','.join([str(id) for id in booklist])
return HttpResponse(output)
You are iterating through the object list, you just need to reference the column/attribute you want:
output = ','.join([obj.id for obj in booklist])
Alternatively you can more more finely craft you original db call, then the iterable you use will work. In this case we'll pull out a list of the 'id' attribute.
booklist = bookInfo.objects.order_by('Name').values_list('id', flat=True)[:10]
output = ','.join([id for id in booklist])
I think you are successful in pulling the data. It is just that booklist contains objects, not numeric ids. You can add __unicode__ method to you class BookInfo that is supposed to return a string representation of the object (probably book name in this case). This method is going to be invoked when str() is applied. You can find more info about __unicode__ here.