ruby write json file from an object
Solution 1
You'd need to add the commas yourself. f.write(n.to_json)
is going to write out a single Province. It has no way to know you're going to keep writing more and need a comma.
Is there a reason you can't do this instead?
File.open('file_json_complete.json', 'w') do |f|
f.puts prov_instances.to_json
end
Solution 2
I needed to take the hash {} and cast it to_json
in order to create a json string
class Province
def to_json(*a)
{'provOrigine' => @provOrigine.to_s,
'destination' => @destination.to_s,
'q1' => @q1.to_s, 'q2' => @q2.to_s,
'q3' => @q3.to_s, 'q4' => @q4.to_s
}.to_json(*a)
end
end
I don't need to loop thought each instances. I could take the object Array and cast it to_json
File.open("file_json_complete.json", "w") do |f|
f.write(prov_instances.to_json)
end
Papouche Guinslyzinho
Updated on June 14, 2022Comments
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Papouche Guinslyzinho almost 2 years
I'm getting an error
expected ':' after property name in object at line 1 column 15
how can I get rid of '=>'? when I replace "=>" by ":" in the to_json methods I'm getting an errorsyntax error, unexpected ':', expecting =>
require 'json' class Province attr_accessor :provOrigine, :destination, :total, :q1, :q2, :q3, :q4 def initialize(line) @provOrigine = line.split(';').first.split(",").first @destination = line.split(';').at(1).split(',').first @q1 = (line.split(';').at(4)).to_i @q2 = (line.split(';').at(5)).to_i @q3 = (line.split(';').at(6)).to_i @q4 = (line.split(';').at(7)).to_i end def to_json {'provOrigine' => @provOrigine.to_s, 'destination' => @destination.to_s, 'q1' => @q1.to_s, 'q2' => @q2.to_s, 'q3' => @q3.to_s, 'q4' => @q4.to_s} end end
...
prov_instances =
contains All the instances of Province ...File.open("file_json_complete.json", "w") do |f| prov_instances.each do |n| f.write(n.to_json) end end
this is the result I'm getting
{"provOrigine"=>"Alberta", "destination"=>"Terre-Neuve-et-Labrador", "q1"=>"777", "q2"=>"1089", "q3"=>"553", "q4"=>"474"}{"provOrigine"=>"Alberta", "destination"=>"Nunavut", "q1"=>"24", "q2"=>"70", "q3"=>"29", "q4"=>"29"}{"provOrigine"=>"Alberta", "destination"=>"Île-du-Prince-Édouard", "q1"=>"116", "q2"=>"69", "q3"=>"150", "q4"=>"64" }
and there is no commas between each object?
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Papouche Guinslyzinho over 9 yearsThanks Phillip but the output of your answer is
"#<Province:0x8c40f10>","#<Province:0x8c352dc>"
it's seems that I really need to append.to_json(*a)
inside of the method to_json