(Ruby) Modify Parts of JSON Document

Demonstrates how to modify parts of a JSON document. This example uses the following JSON document:

{
   "fruit": [
      	{
         "kind": "apple",
	 "count": 24,
	 "fresh": true,
	 "extraInfo": null,
	 "listA": [ "abc", 1, null, false ],
	 "objectB": { "animal" : "monkey" }
      	},
	{
         "kind": "pear",
	 "count": 18,
	 "fresh": false,
	 "extraInfo": null
	 "listA": [ "xyz", 24, null, true ],
	 "objectB": { "animal" : "lemur" }
	}
    ],
    "list" : [ "banana", 12, true, null, "orange", 12.5, { "ticker": "AAPL" }, [ 1, 2, 3, 4, 5 ] ],
    "alien" : true
}

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

success = false

json = Chilkat::CkJsonObject.new()

# Load the JSON from a file.
success = json.LoadFile("qa_data/json/modifySample.json")
if (success == false)
    print json.lastErrorText() + "\n";
    exit
end

# This example will not check for errors (i.e. null / false / 0 return values)...

# Get the "list" array:

listA = Chilkat::CkJsonArray.new()

json.ArrayOf2("list",listA)

# Modify values in the list.

# Change banana to plantain
success = listA.SetStringAt(0,"plantain")

# Change 12 to 24
success = listA.SetIntAt(1,24)

# Change true to false
success = listA.SetBoolAt(2,false)

# Is the 3rd item null?
bNull = listA.IsNullAt(3)

# Change "orange" to 32.
success = listA.SetIntAt(4,32)

# Change 12.5 to 31.2
success = listA.SetNumberAt(5,"31.2")

# Replace the { "ticker" : "AAPL" } object with { "ticker" : "GOOG" }
# Do this by deleting, then inserting a new object at the same location.
success = listA.DeleteAt(6)
tickerObj = Chilkat::CkJsonObject.new()
listA.AddObjectAt2(6,tickerObj)

success = tickerObj.AppendString("ticker","GOOG")

# Replace "[ 1, 2, 3, 4, 5 ]" with "[ "apple", 22, true, null, 1080.25 ]"
success = listA.DeleteAt(7)
aa = Chilkat::CkJsonArray.new()
listA.AddArrayAt2(7,aa)

success = aa.AddStringAt(-1,"apple")
success = aa.AddIntAt(-1,22)
success = aa.AddBoolAt(-1,true)
success = aa.AddNullAt(-1)
success = aa.AddNumberAt(-1,"1080.25")

# Get the "fruit" array
aFruit = Chilkat::CkJsonArray.new()
json.ArrayAt2(0,aFruit)

# Get the 1st element:
appleObj = Chilkat::CkJsonObject.new()
aFruit.ObjectAt2(0,appleObj)

# Modify values by member name:
success = appleObj.SetStringOf("fruit","fuji_apple")
success = appleObj.SetIntOf("count",46)
success = appleObj.SetBoolOf("fresh",false)
success = appleObj.SetStringOf("extraInfo","developed by growers at the Tohoku Research Station in Fujisaki")

# Modify values by index:

pearObj = Chilkat::CkJsonObject.new()
aFruit.ObjectAt2(1,pearObj)

success = pearObj.SetStringAt(0,"bartlett_pear")
success = pearObj.SetIntAt(1,12)
success = pearObj.SetBoolAt(2,false)
success = pearObj.SetStringAt(3,"harvested in late August to early September")

json.put_EmitCompact(false)
print json.emit() + "\n";