I have a Rails app and I am trying to render an array of items from a parsed JSON hash.
My current render statement looks like this
resp = JSON.parse(response.body)
render json: resp
I am using Typheous and this code did not work for me:
resp = JSON.parse(response.body).fetch("item")
The following is the JSON hash (the item key has many values but I'm only displaying one for brevity):
{
ebay: [{
findItemsByKeywordsResponse: [{
ack: [],
version: [],
timestamp: [],
searchResult: [{
count: "91",
item: [{
itemId: [ "321453454731" ]
}]
}]
}]
}]
}
How can I render an array of items from the parsed JSON hash?
Since there is only one value for the ebay and findItemsByKeywordsResponse keys (per the OP's comment), you could retrieve an array of items by doing something like this:
resp = JSON.parse(response.body)
resp[:ebay].first[:findItemsByKeywordsResponse].first[:searchResult].first[:item]
This will give you an array of hashes containing the itemId and any other key-value pairs.
The reason you want to include the .first (or [0]) is because based on the parsed JSON response, your hash contains an array of hashes nested all the way to the item array. If there are multiple searchResult values, you'll need to iterate through those before getting your item array.
Related
I'm trying to merge a custom array with the result of render json.
render json: #value, each_serializer: JsonApi::ValueSerializer
and the array is a = [1,2,3] .
with the result of this json is it possible to append the array?
The array will be constructed into json as
"a":{"1": "one","2":"two", "3": "three"}
Normally the json value from serializer is
'{"data":{"value_id":"1","attributes {{"id": "1","email":"tech#sample.com","access_locked":false},{"id": "2","email":"tech2#sample.com","access_locked":true}}}'
The final needed result after appending "a" json with normalized value is
'{"data":{"value_id":"1","attributes {{"id": "1","email":"tech#sample.com","access_locked":false},{"id": "2","email":"tech2#sample.com","access_locked":true}}, "a":{"1": "one","2":"two", "3": "three"}}}'
I have a Ruby array of students. Student class has attributes id, name and age.
students = [
{id:"id1",name:"name1",age:"age1"},
{id:"id2",name:"name2",age:"age2"},
{id:"id3",name:"name3",age:"age3"}
]
I want to create a JSON key value object from this array as follows.
json_object = {id1:name1, id2:name2, id3:name3}
input = [ {id:"id1",name:"name1",age:"age1"},
{id:"id2",name:"name2",age:"age2"},
{id:"id3",name:"name3",age:"age3"}]
require 'json'
JSON.dump(input.map { |hash| [hash[:id], hash[:name]] }.to_h)
#⇒ '{"id1":"name1","id2":"name2","id3":"name3"}'
Give this a go:
students = [
{id:"id1",name:"name1",age:"age1"},
{id:"id2",name:"name2",age:"age2"},
{id:"id3",name:"name3",age:"age3"}
]
json_object = students.each_with_object({}) do |hsh, returning|
returning[hsh[:id]] = hsh[:name]
end.to_json
In console:
puts json_object
=> {"id1":"name1","id2":"name2","id3":"name3"}
Your data is all identical, but if you wanted to generate a hash that took the value of students[n][:id] as keys and students[n][:name] as values you could do this:
student_ids_to_names = students.each_with_object({}) do |student, memo|
memo[student[:id]] = student[:name]
end
For your data, you'd end up with only one entry as the students are identical: { "id1" => "name1" }. If the data were different each key would be unique on :id.
Once you have a hash, you can call json_object = students_ids_to_names.to_json to get a JSON string.
I have a SQL query returns some data, here is some sample output:
[
{
"AccountCode": "111123456",
"AccountID": 123456,
"BalanceCurrent": "-8.0",
"Phone": "123456888",
}
]
This is a Hash with an array. There are times when there will be multiple hashes within the array. Just one in this example though.
As stated, this data comes directly from the database.
I have a lookup_phone method in my Customer model that runs the SQL query and then executed in the customer_controller.rb file like so:
customer_phone = Customer.lookup_phone(params[:Phone])
Now, I need to append some extra data to these hash(es) that do not come from the database, like so:
data = [
:match_found => true,
:transfer_flag => false,
:confirm_id => 2
]
This data variable needs to be WITHIN each hash object, not a separate hash object on its own.
Using a simple array concat or + always makes the data a separate hash object. I've come across some good posts saying to use reduce along with merge, but those are Hash methods, not Array methods.
If I try to set data as a Hash instead of an array, I get
no implicit conversion of Hash into Array when I try to do
customer_phone.reduce({}, :merge)
after running customer_phone += data
What is the proper way to append data to an existing Hash object?
maybe combine each and merge
base = [
{
"AccountCode": "111123456",
"AccountID": 123456,
"BalanceCurrent": "-8.0",
"Phone": "123456888",
}
]
data = {:match_found=>true, :transfer_flag=>false, :confirm_id=>2}
base.each { |el| el.merge!(data) }
#=> [{:AccountCode=>"111123456", :AccountID=>123456, :BalanceCurrent=>"-8.0", :Phone=>"123456888", :match_found=>true, :transfer_flag=>false, :confirm_id=>2}]
You can add attr_accessor to your Customer model like this
class Customer
attr_accessor :data
end
With your data array:
data_array = [
:match_found => true,
:transfer_flag => false,
:confirm_id => 2
]
Then, you can execute the query combined with each function:
customer_phone = Customer.lookup_phone(params[:Phone]).each {|e| e.data = data_array}
Access it:
customer_phone.first.data
To render json:
render json: customer_phone, methods: [:data]
I have a function that has multiple objects. I would like to pass these objects as one JSON object from my rails app to my angularjs app
#states = State.all
#nationalities = Nationality.all
#states_nationalities = {
states: #states,
nationalities: #nationalities
}
I thought i could do this but I am getting an error. Any help is appreciated
Hash.to_json
#states_nationalities.to_json
or for rendering
render :json #states_nationalities
#states_nationalities = {
states: #states,
nationalities: #nationalities
}
The above snippet when render as JSON should output this structure (barring that there isn't data returned from the AR calls).
{
"states": [{}, {}, {}],
"nationalities": [{}, {}, {}]
}
Both keys point to an array of objects that are your states and nationalities in your app.
What's the goal for the JSON structure to look like/what's the error you're getting?
I got two JSON that are structured like this. First one comes from an API:
[
{
"course_code":"Basic 101 - 0913",
"name":"Basic 101",
"start_at":"2013-09-16T00:00:00+02:00",
"end_at":"2013-10-13T23:55:00+02:00",
"workflow_state":"available"
},
{"course_code":"Medium 201 - 0913",
"name":"Medium 201",
"start_at":"2013-08-06T16:55:25+02:00",
"end_at":null,
"workflow_state":"available"
}
]
The second one is a JSON export from my database:
[
{
"id":1,
"course_id":"Basic 101",
"name":"Basic Level",
"description":"blablabla",
"discipline_id":"1",
"duration":"28",
"created_at":null,
"updated_at":null
},
{
"id":2,
"course_id":"Medium 201",
"name":"Medium Level",
"description":"blablabla",
"discipline_id":"1",
"duration":"28",
"created_at":null,
"updated_at":null
}
]
I would like to merge these two JSON into one, with matched :name in the first JSON and :course_id in the second one.
If you know good tutorials on using JSON in Rails, I'm really interested.
This isn't really a JSON issue.
When parsing JSON data it returns arrays and hashes.
One way of merging it in this case would be to loop through the data and check for the parameters you want/need to match. Once you find a match you can either manually create a new Hash with the needed data or you could use
hash1.merge(hash2)
http://www.ruby-doc.org/core-1.9.3/Hash.html#method-i-merge
which would return a hash consisting of both Hashes - attributes with the same name would be overwritten in the first hash.
Just a quick answer, to let you know where to go. Assuming first json is in json1 and second is in json2 variables, this code:
require 'json'
arr1 = JSON.parse(json1)
arr2 = JSON.parse(json2)
mrg = []
arr1.each do |el1|
arr2.each do |el2|
if el2['course_id'] == el1['name']
mrg.push(el1.merge(el2))
end
end
end
p mrg
Will print:
[
{
"course_code"=>"Basic 101 - 0913",
"name"=>"Basic Level",
"start_at"=>"2013-09-16T00:00:00+02:00",
"end_at"=>"2013-10-13T23:55:00+02:00",
"workflow_state"=>"available",
"id"=>1,
"course_id"=>"Basic 101",
"description"=>"blablabla",
"discipline_id"=>"1",
"duration"=>"28",
"created_at"=>nil,
"updated_at"=>nil
},
{
"course_code"=>"Medium 201 - 0913",
"name"=>"Medium Level",
"start_at"=>"2013-08-06T16:55:25+02:00",
"end_at"=>nil,
"workflow_state"=>"available",
"id"=>2,
"course_id"=>"Medium 201",
"description"=>"blablabla",
"discipline_id"=>"1",
"duration"=>"28",
"created_at"=>nil,
"updated_at"=>nil
}
]