How to add array of hashes in environment file

suppose i have an attribute as shown below

default[‘a’][‘b’][‘z’] = [{ name: ‘x1’, type: ‘d’ }, { name: ‘y’, type: ‘d’ }, { name: ‘z’, type: ‘d’ }]

How do i overide this on an environment file , i tried adding below attribute into environment file
and its treating as a string

“a": {
“b": {
“c”: “[{ :name => ‘x1’, :type => ‘d’ }, { :name => ‘y1’, :type => ‘d’ }, { :name => ‘z1’, :type => ‘d’ }]”
}
},

You didn’t mention if you were updating a ruby environment or a json one, so below are what you’d expect to see for both of those, per the docs.

In JSON -

{
	"name": "dev",
	"default_attributes": {
		"a": {
			"b": {
				"c": [{
					"name": "x1",
					"type": "d"
				}, {
					"name": "y1",
					"type": "d"
				}, {
					"name": "z1",
					"type": "d"
				}]
			}
		}
	},
	"json_class": "Chef::Environment",
	"description": "The development environment",
	"cookbook_versions": {
		"my_test_cookbook": "= 1.2.0"
	},
	"chef_type": "environment"
}

[In Ruby](json -

name 'dev'
description 'The development environment'
cookbook_versions  'my_test_cookbook' => '= 1.2.0'
default_attributes 'a' => { 'b' =>  {'c' => [ {:name => 'x1', :type => 'd'}, {:name => 'y1', :type => 'd'}, {:name => 'z1', :type => 'd'}]} }

Thanks Steve.