How can i create JSON array of JSON objects in ruby from a loop
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I am trying to loop through some video objects and i am trying to build a JSON array that looks like this:
[{"event_name":"video_completed","object_id":123456789}]
I created a method to do this:
def self.getEngagementRules(videos)
rules =
videos.each do |video|
rule = {
event_name: "video_completed",
object_id: video.image_hash.to_i
}
rules << rule.to_json
end
rules
end
I am creating hashes and then turning them into JSON and appending it to my array rules but when i run:
puts rules
i get {"event_name":"video_completed","object_id":123456789}
instead of [{"event_name":"video_completed","object_id":123456789}]
What is the correct way of doing this so i can loop through multiple videos and get my desired result.
It should be able to handle multiple videos and output:
[{"event_name":"video_completed","object_id":123456789}, {"event_name":"video_completed","object_id":123456789}]
ruby-on-rails ruby
asked Nov 16 '18 at 14:39
RickSRickS
752716
add a comment |
I am trying to loop through some video objects and i am trying to build a JSON array that looks like this:
[{"event_name":"video_completed","object_id":123456789}]
I created a method to do this:
def self.getEngagementRules(videos)
rules =
videos.each do |video|
rule = {
event_name: "video_completed",
object_id: video.image_hash.to_i
}
rules << rule.to_json
end
rules
end
I am creating hashes and then turning them into JSON and appending it to my array rules but when i run:
puts rules
i get {"event_name":"video_completed","object_id":123456789}
instead of [{"event_name":"video_completed","object_id":123456789}]
What is the correct way of doing this so i can loop through multiple videos and get my desired result.
It should be able to handle multiple videos and output:
[{"event_name":"video_completed","object_id":123456789}, {"event_name":"video_completed","object_id":123456789}]
ruby-on-rails ruby
asked Nov 16 '18 at 14:39
RickSRickS
752716
1
Your code works fine, aren't you printingruleinstead ofrulesby mistake? Also, each element in your array will be a string representing a JSON["{"event_name":"video_completed","object_id":1234}"]
– byrdEmmanuel
Nov 16 '18 at 14:52
add a comment |
I am trying to loop through some video objects and i am trying to build a JSON array that looks like this:
[{"event_name":"video_completed","object_id":123456789}]
I created a method to do this:
def self.getEngagementRules(videos)
rules =
videos.each do |video|
rule = {
event_name: "video_completed",
object_id: video.image_hash.to_i
}
rules << rule.to_json
end
rules
end
I am creating hashes and then turning them into JSON and appending it to my array rules but when i run:
puts rules
i get {"event_name":"video_completed","object_id":123456789}
instead of [{"event_name":"video_completed","object_id":123456789}]
What is the correct way of doing this so i can loop through multiple videos and get my desired result.
It should be able to handle multiple videos and output:
[{"event_name":"video_completed","object_id":123456789}, {"event_name":"video_completed","object_id":123456789}]
ruby-on-rails ruby
asked Nov 16 '18 at 14:39
RickSRickS
752716
I am trying to loop through some video objects and i am trying to build a JSON array that looks like this:
[{"event_name":"video_completed","object_id":123456789}]
I created a method to do this:
def self.getEngagementRules(videos)
rules =
videos.each do |video|
rule = {
event_name: "video_completed",
object_id: video.image_hash.to_i
}
rules << rule.to_json
end
rules
end
I am creating hashes and then turning them into JSON and appending it to my array rules but when i run:
puts rules
i get {"event_name":"video_completed","object_id":123456789}
instead of [{"event_name":"video_completed","object_id":123456789}]
What is the correct way of doing this so i can loop through multiple videos and get my desired result.
It should be able to handle multiple videos and output:
[{"event_name":"video_completed","object_id":123456789}, {"event_name":"video_completed","object_id":123456789}]
ruby-on-rails ruby
ruby-on-rails ruby
asked Nov 16 '18 at 14:39
RickSRickS
752716
asked Nov 16 '18 at 14:39
RickSRickS
752716
asked Nov 16 '18 at 14:39
RickSRickS
752716
asked Nov 16 '18 at 14:39
RickSRickS
752716
asked Nov 16 '18 at 14:39
RickSRickS
752716
752716
1
Your code works fine, aren't you printingruleinstead ofrulesby mistake? Also, each element in your array will be a string representing a JSON["{"event_name":"video_completed","object_id":1234}"]
– byrdEmmanuel
Nov 16 '18 at 14:52
add a comment |
1
Your code works fine, aren't you printingruleinstead ofrulesby mistake? Also, each element in your array will be a string representing a JSON["{"event_name":"video_completed","object_id":1234}"]
– byrdEmmanuel
Nov 16 '18 at 14:52
1
1
Your code works fine, aren't you printing
rule instead of rules by mistake? Also, each element in your array will be a string representing a JSON ["{"event_name":"video_completed","object_id":1234}"]– byrdEmmanuel
Nov 16 '18 at 14:52
Your code works fine, aren't you printing
rule instead of rules by mistake? Also, each element in your array will be a string representing a JSON ["{"event_name":"video_completed","object_id":1234}"]– byrdEmmanuel
Nov 16 '18 at 14:52
add a comment |
2 Answers
2
active
oldest
votes
You want to first compose a ruby array and then convert it to JSON:
rules = videos.map do |video|
{
event_name: "video_completed",
object_id: video.image_hash.to_i
}
end
rules.to_json
.each should only be used when you are only concerned with the side effects of the loop and not the return value.
Otherwise you should be using .map, .inject, .each_with_object etc which signify to other programmers that you care about the return value (and know what you are doing).
answered Nov 16 '18 at 14:54
maxmax
46.7k1060106
What do you mean by 'side effects of the loop'?
– RickS
Nov 16 '18 at 14:56
1
For example in ERB templates you use.eachsince you are outputting to a string buffer and the return value is not used.
– max
Nov 16 '18 at 14:59
Thanks! I might need to go through my project and see where else i can use map instead of each haha
– RickS
Nov 16 '18 at 15:04
add a comment |
Your code works right, you have an array but puts prints each element of the array in a separate line
puts [1, 2, 3]
1
2
3
answered Nov 16 '18 at 14:54
luisenrikeluisenrike
1,884919
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
You want to first compose a ruby array and then convert it to JSON:
rules = videos.map do |video|
{
event_name: "video_completed",
object_id: video.image_hash.to_i
}
end
rules.to_json
.each should only be used when you are only concerned with the side effects of the loop and not the return value.
Otherwise you should be using .map, .inject, .each_with_object etc which signify to other programmers that you care about the return value (and know what you are doing).
answered Nov 16 '18 at 14:54
maxmax
46.7k1060106
What do you mean by 'side effects of the loop'?
– RickS
Nov 16 '18 at 14:56
1
For example in ERB templates you use.eachsince you are outputting to a string buffer and the return value is not used.
– max
Nov 16 '18 at 14:59
Thanks! I might need to go through my project and see where else i can use map instead of each haha
– RickS
Nov 16 '18 at 15:04
add a comment |
You want to first compose a ruby array and then convert it to JSON:
rules = videos.map do |video|
{
event_name: "video_completed",
object_id: video.image_hash.to_i
}
end
rules.to_json
.each should only be used when you are only concerned with the side effects of the loop and not the return value.
Otherwise you should be using .map, .inject, .each_with_object etc which signify to other programmers that you care about the return value (and know what you are doing).
answered Nov 16 '18 at 14:54
maxmax
46.7k1060106
What do you mean by 'side effects of the loop'?
– RickS
Nov 16 '18 at 14:56
1
For example in ERB templates you use.eachsince you are outputting to a string buffer and the return value is not used.
– max
Nov 16 '18 at 14:59
Thanks! I might need to go through my project and see where else i can use map instead of each haha
– RickS
Nov 16 '18 at 15:04
add a comment |
You want to first compose a ruby array and then convert it to JSON:
rules = videos.map do |video|
{
event_name: "video_completed",
object_id: video.image_hash.to_i
}
end
rules.to_json
.each should only be used when you are only concerned with the side effects of the loop and not the return value.
Otherwise you should be using .map, .inject, .each_with_object etc which signify to other programmers that you care about the return value (and know what you are doing).
answered Nov 16 '18 at 14:54
maxmax
46.7k1060106
You want to first compose a ruby array and then convert it to JSON:
rules = videos.map do |video|
{
event_name: "video_completed",
object_id: video.image_hash.to_i
}
end
rules.to_json
.each should only be used when you are only concerned with the side effects of the loop and not the return value.
Otherwise you should be using .map, .inject, .each_with_object etc which signify to other programmers that you care about the return value (and know what you are doing).
answered Nov 16 '18 at 14:54
maxmax
46.7k1060106
answered Nov 16 '18 at 14:54
maxmax
46.7k1060106
answered Nov 16 '18 at 14:54
maxmax
46.7k1060106
answered Nov 16 '18 at 14:54
maxmax
46.7k1060106
46.7k1060106
What do you mean by 'side effects of the loop'?
– RickS
Nov 16 '18 at 14:56
1
For example in ERB templates you use.eachsince you are outputting to a string buffer and the return value is not used.
– max
Nov 16 '18 at 14:59
Thanks! I might need to go through my project and see where else i can use map instead of each haha
– RickS
Nov 16 '18 at 15:04
add a comment |
What do you mean by 'side effects of the loop'?
– RickS
Nov 16 '18 at 14:56
1
For example in ERB templates you use.eachsince you are outputting to a string buffer and the return value is not used.
– max
Nov 16 '18 at 14:59
Thanks! I might need to go through my project and see where else i can use map instead of each haha
– RickS
Nov 16 '18 at 15:04
What do you mean by 'side effects of the loop'?
– RickS
Nov 16 '18 at 14:56
What do you mean by 'side effects of the loop'?
– RickS
Nov 16 '18 at 14:56
1
1
For example in ERB templates you use
.each since you are outputting to a string buffer and the return value is not used.– max
Nov 16 '18 at 14:59
For example in ERB templates you use
.each since you are outputting to a string buffer and the return value is not used.– max
Nov 16 '18 at 14:59
Thanks! I might need to go through my project and see where else i can use map instead of each haha
– RickS
Nov 16 '18 at 15:04
Thanks! I might need to go through my project and see where else i can use map instead of each haha
– RickS
Nov 16 '18 at 15:04
add a comment |
Your code works right, you have an array but puts prints each element of the array in a separate line
puts [1, 2, 3]
1
2
3
answered Nov 16 '18 at 14:54
luisenrikeluisenrike
1,884919
add a comment |
Your code works right, you have an array but puts prints each element of the array in a separate line
puts [1, 2, 3]
1
2
3
answered Nov 16 '18 at 14:54
luisenrikeluisenrike
1,884919
add a comment |
Your code works right, you have an array but puts prints each element of the array in a separate line
puts [1, 2, 3]
1
2
3
answered Nov 16 '18 at 14:54
luisenrikeluisenrike
1,884919
Your code works right, you have an array but puts prints each element of the array in a separate line
puts [1, 2, 3]
1
2
3
answered Nov 16 '18 at 14:54
luisenrikeluisenrike
1,884919
answered Nov 16 '18 at 14:54
luisenrikeluisenrike
1,884919
answered Nov 16 '18 at 14:54
luisenrikeluisenrike
1,884919
answered Nov 16 '18 at 14:54
luisenrikeluisenrike
1,884919
1,884919
add a comment |
add a comment |
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1
Your code works fine, aren't you printing
ruleinstead ofrulesby mistake? Also, each element in your array will be a string representing a JSON["{"event_name":"video_completed","object_id":1234}"]– byrdEmmanuel
Nov 16 '18 at 14:52