Tcl

Find and Delete Object from JSON Array

See more JSON Examples

Demonstrates how to find an delete an object from a JSON array of objects. Tcl

load ./chilkat.dll

set success 0

# This example will delete the "Pasta" category object from Menu B.

# {
#   "menus": [
#     {
#       "name": "Menu A",
#       "categories": [
# 			{
# 			"name": "Kebabs",
# 			"description": "blah blah blah"
# 			},
# 			{
# 			"name": "Burgers",
# 			"description": "blah blah blah"
# 			},
# 			{
# 			"name": "Pasta",
# 			"description": "blah blah blah"
# 			},
# 			{
# 			"name": "Appetizers",
# 			"description": "blah blah blah"
# 			}
# 		]
# 	},
#     {
#       "name": "Menu B",
#       "categories": [
# 			{
# 			"name": "Kebabs",
# 			"description": "blah blah blah"
# 			},
# 			{
# 			"name": "Burgers",
# 			"description": "blah blah blah"
# 			},
# 			{
# 			"name": "Pasta",
# 			"description": "blah blah blah"
# 			},
# 			{
# 			"name": "Appetizers",
# 			"description": "blah blah blah"
# 			}
# 		]
# 	  }
# 	]
# }

set json [new_CkJsonObject]

set success [CkJsonObject_LoadFile $json "qa_data/json/menus.json"]
if {$success == 0} then {
    puts [CkJsonObject_lastErrorText $json]
    delete_CkJsonObject $json
    exit
}

# Find Menu B.
# menu is a CkJsonObject
set menu [CkJsonObject_FindRecord $json "menus" "name" "Menu B" 1]
# assume menu is found..

# Get the categories array, and then find the index of the "Pasta" menu category.
# catArr is a CkJsonArray
set catArr [CkJsonObject_ArrayOf $menu "categories"]
# Assume it is found..

# Find the object where the name of the JSON member is "name", and the value is "Pasta"
set index [CkJsonArray_FindObject $catArr "name" "Pasta" 1]
if {$index < 0} then {
    puts "Pasta not found."
} else {

    # Delete the "Pasta" category record from Menu B
    set success [CkJsonArray_DeleteAt $catArr $index]
    # Assume OK..
}

# Examine the JSON to see if it worked as expected..
CkJsonObject_put_EmitCompact $json 0
puts [CkJsonObject_emit $json]

delete_CkJsonArray $catArr

delete_CkJsonObject $menu


delete_CkJsonObject $json