How can i access the year from the json shown below which i fetch from a url and decode using
obj = ActiveSupport::JSON.decode(response.body)
The folloowing is the response i get after decode
{
"educations"=>{"_total"=>1,
"values"=>[
{"id"=>18234534505,
"schoolName"=>"Test",
"startDate"=>{"year"=>2013}
}
]
}
}
How can i access the year? I can able to access the values as
obj['educations']['values']
and it responds as
{"id"=>18234534505, "schoolName"=>"Test", "startDate"=>{"year"=>2013}}
but how can i get the year? please help me.
UPDATE:
how can i add if condition here?
obj["educations"]["values"].each do |value|
#user_education = Education.new("start_date" =>
value['startDate']['year'], "education_id" => value['id'],
"school_name" => value['schoolName'])
end
so here if there is no year then how can i check as you said? and there may also be endDate similar to the startDate so how can i check this?
Just access the key as
obj["educations"]["values"].first["startDate"]["year"]
# above is answer if there is always one array inside `obj["educations"]["values"]`
For multiple arrays's
year = []
obj["educations"]["values"].each do |object|
year << object["startDate"]["year"] if !object["startDate"].blank? and !object["startDate"]["year"].blank?
end
update :
If you want to add attributes to the
#user_education = Education.new
#user_education.start_date = value['startDate']['year'] if !value['startDate'].blank? and !value['startDate']['year'].blank?
#user_education.education_id = value['id'] if !value['id'].blank?
#user_education.school_name = value['schoolName'] if !value['schoolName'].blank?
Similarly for any other attribute..
obj["educations"]["values"].each do |value|
#user_education = Education.new("education_id" => value['id'], "school_name" => value['schoolName'])
#user_education.start_date = value["startDate"]["year"] if !value["startDate"].blank? and !object["startDate"]["year"].blank?
#user_education.save! #To save the object
end
Related
I have a concept called snapshot which basically stores a snapshot of how data looked at a certain period of time. What I'm building is a method that loops through the snapshots for each events, and builds a small hash outlining the ownership over time for a given shareholder.
def fetch_ownership_over_time(shareholder, captable)
#shareholder = Shareholder.find(shareholder.id)
#captable = Captable.find(captable.id)
#company = #captable.company.id
#ownership_over_time = []
#captable.events.collect(&:snapshot).each do |snapshot|
parsed_snapshot = JSON.parse(snapshot)
#ownership_over_time.push(parsed_snapshot["event"]["name"])
#ownership_over_time.push(parsed_snapshot["event"]["date"])
parsed_snapshot["shareholders"].each do |shareholder|
if shareholder["id"] == #shareholder.id
#ownership_over_time.push(shareholder["ownership_percentage"])
end
end
end
return #ownership_over_time
end
I then call this method in my view which successfully retrieves the correct values however they are not structured in any way:
["Event 1 ", "2018-11-19", "0.666666666666667", "Event 2 ", "2018-11-19", "0.333333333333333", "4th event ", "2018-11-19", "0.315789473684211"]
What I'd like to do now though is construct my hash so that each separate snapshot event contains a name, date and ownership_percentage.
Perhaps something like this:
ownership_over_time = [
{
event_name = "Event 1" #parsed_snapshot["event"]["name"]
event_date = "20180202" #parsed_snapshot["event"]["date"]
ownership_percentage = 0.37 #shareholder["ownership_percentage"]
},
{
event_name = "Event 2" #parsed_snapshot["event"]["name"]
event_date = "20180501" #parsed_snapshot["event"]["date"]
ownership_percentage = 0.60 #shareholder["ownership_percentage"]
}
]
My challenge though is that the ["event"]["name"] an ["event"]["date"] attributes I need to fetch when looping over my snapshots i.e. the first loop (.each do |snapshot|) whereas I get my ownership_percentage when looping over shareholders - the second loop (.each do |shareholder|).
So my question is - how can I build this hash in "two" places so I can return the hash with the 3 attributes?
Appreciative of guidance/help - thank you!
You have to create a new hash for the object and append that hash to the array of objects you are creating.
def fetch_ownership_over_time(shareholder, captable)
#shareholder = Shareholder.find(shareholder.id)
#captable = Captable.find(captable.id)
#company = #captable.company.id
#ownership_over_time = []
#captable.events.collect(&:snapshot).each do |snapshot|
parsed_snapshot = JSON.parse(snapshot)
shareholder = parsed_snapshot['shareholders'].select { |s| s['id'] == #shareholder.id }.first
local_snapshot = {
'event_name' => parsed_snapshot['event']['name'],
'event_date' => parsed_snapshot['event']['date'],
'ownership_percentage' => shareholder.try(:[], "ownership_percentage") || 0
}
#ownership_over_time.push local_snapshot
end
return #ownership_over_time
end
Notice that I changed your second loop to a select. As you currently have it, you risk on pushing two percentages if the id is found twice.
EDIT:
Added functionality to use a default value if no shareholder is found.
I need to retrieve data from database column and put them to
[{1442507641,1},{1442507642,2},{1442507643,3},{1442507644,4}...]
format as the plot format requires.
I'm trying to do this by :
#data = TableName.where(:id => requiredid)
.map {|r| { r.received_date.to_i => r.value } }
but this returns format
data=[{1442507641=>6}, {1442507641=>7}, {1442507641=>5}, {1442507641=>6}, {1442507641=>5}, {1442507695=>9}, {1442507695=>9}, {1442507695=>7}, {1442507695=>8}]
How can I make the bracket as plot requires and remove the strange => ?
It seems like this ought to do what you're asking for:
parts = TableName.where(:id => requiredid).map do |r|
sprintf("{%d,%d}", r.received_date, r.value)
end
#data = "[#{parts.join(",")}]"
It's only for your options to manipulate your data:
#data = []
#data = User.where(:id => requiredid).map {|r| #data << "{#{r. received_date}, #{r.value}}"}
First you make #data as array. Than collect the string into array.
I am trying to create the back-end for a calendar system. The calendar is just a list of Events. I am trying to organise this in to a reasonable JSON response. The structure I am looking to replicate would be something like this
eventsList = [
{ 'year' => 2014,
'events' => [{event data hash 1},
{event data hash 2}]
},
{ 'year' => 2015,
'events' => [{event data hash 1},
{event data hash 2}]
}
]
I am having trouble trying to add events to the right array. Below I have Event.all and I am trying to sort the list.
events = Event.all
eventList = []
events.each do |event|
#Creates a hash of the current event info
eventInfo = {'description' => event.description, 'startdate' => event.startdate}
eventMonthNumber = event.startdate.strftime('%m').to_i
eventMonthName = event.startdate.strftime('%B')
eventYearNumber = event.startdate.strftime('%Y').to_i
# Adds year to eventList if it isn't present
unless eventList.include?(eventYearNumber)
eventList << {'year' => eventYearNumber, 'events' => []}
end
# Tries to find current year hash in array and add to event key
currentYear = eventList.select {|event| event['year'] == eventYearNumber}
currentYear['events'] << eventInfo
end
I get the error no implicit conversion of String into Integer. I am not entirely sure whether the eventList.select is the correct way to go about this
Although I have moved away from this current structure the change that made it work was swapping out
eventList.select
For
eventList.detect
Select returns an array (?) And detect returns one item.
I have a array which is inside a hash. I want know the result of the student (pass/fail) using the following array. First I have to match them with particular standard and compare their marks with the hash pass and fails. And I want to get the key pass or fail based on their mark. How to achieve this using Ruby?
array = [
{
:standard =>1
:pass=>{:tamil=>30,:eng=>25,:math=>35},
:fail=>{:tamil=>10,:eng=>15,:maths=>20}
},
{
:standard =>2,
:pass=>{:tamil=>40,:eng=>35,:math=>45},
:fail=>{:tamil=>20,:eng=>25,:maths=>30}
}
]
#student is assumed to be defined
standard = array.select {|standard| standard[:standard] == #student.standard}
eng_pass = #student.eng_mark >= standard[:pass][:eng]
eng_fail = #student.eng_mark <= standard[:fail][:eng]
return [eng_pass, eng_fail, whatever_else_you_want]
So on and forth for various topics.
The syntax in reading values from this structure is something like:
array[0][:pass][:eng]
and accordingly you can do the comparison as usual in batch:
for i in 0..#students_array.length
num = # student's score
standard = # something like array[0][:pass][:eng]
if num > standard
# something like 'put "You passed!"'
end
end
I would like to combine data retrieved from an API with local database data in a new JSON. But I think I'm doing this wrong. Here is my code :
#data = ActiveSupport::JSON.decode(#api_data)
#data.each do |key|
if key['state'] == "active"
user_id = key['id']
user_database = User.where(:user_id => user_id).take
#userlist = []
unless user_database.blank?
user_data = {
:user_id => key['id'],
:enrolement_start_date => key['start_at'],
:enrolement_end_date => key['end_at'],
:user_interest => user_database.interests,
:user_discipline_id => user_database.discipline_id,
}
#userlist.push(user_data)
end
end
end
#userlist = #userlist.to_json
Actually, it's working but I only receive the last user as result. I don't figure how to make it works :-/ Many thanks in advance !
#userlist = []
that line, each time through the loop
#data.each do |key|
is clearing out the previous data by re-initializing #userlist. Then you're returning the user you added last, since all the others were thrown away the last time you assigned an empty array to #userlist.
Just move
#userlist = []
above
#data.each do |key|
and you should be good.