Ruby 打印或 return 对象中的特定字段
Ruby print or return specific field from object
如何从 returned 对象打印 group_id
?
以下是return从一个函数中编辑出来的。我想打印 group_id
或 return group_id
{
:security_groups=>[
{
:description=>"Created By ManageIQ",
:group_name=>"MIQ_019",
:ip_permissions=>[
{
:from_port=>22,
:ip_protocol=>"tcp",
:ip_ranges=>[
{
:cidr_ip=>"0.0.0.0/0",
:description=>nil
}
],
:ipv_6_ranges=>[],
:prefix_list_ids=>[],
:to_port=>22,
:user_id_group_pairs=>[]
}
],
:owner_id=>"943755119718",
:group_id=>"sg-0c2c5f219f1bafc1a",
:ip_permissions_egress=>[
{
:from_port=>nil,
:ip_protocol=>"-1",
:ip_ranges=>[
{
:cidr_ip=>"0.0.0.0/0",
:description=>nil
}
],
:ipv_6_ranges=>[],
:prefix_list_ids=>[],
:to_port=>nil,
:user_id_group_pairs=>[]
}
],
:tags=>[],
:vpc_id=>"vpc-d817c1b3"
}
],
:next_token=>nil
}
这是函数:我要return security_group.group_id
def describe_security_group (
group_name
)
ec2 = get_aws_client
security_group = ec2.describe_security_groups(
filters: [
{name: 'group-name', values: [ group_name ]}]
)
puts "Describing security group '#{group_name}' with ID " \
"'#{security_group}'"
return security_group
rescue StandardError => e
puts "Error describing security group: #{e.message}"
return
end
所以,返回值看起来像一个散列,或者你可以让它完全散列。
对于 one-element 数组的情况,您可以简单地使用 ruby dig 方法。
根据您的数据和下面的评论,我们可以像这样访问所需的元素:
# from your ec2 api call
security_group = ec2.describe_security_groups(...)
# Result value is stored in `security_group` variable,
# and looks exactly like hash below
{
:security_groups=>[
{
:description=>"Created By ManageIQ",
:group_name=>"MIQ_019",
:ip_permissions=>[
{
:from_port=>22,
:ip_protocol=>"tcp",
:ip_ranges=>[
{
:cidr_ip=>"0.0.0.0/0",
:description=>nil
}
],
:ipv_6_ranges=>[],
:prefix_list_ids=>[],
:to_port=>22,
:user_id_group_pairs=>[]
}
],
:owner_id=>"943755119718",
:group_id=>"sg-0c2c5f219f1bafc1a",
:ip_permissions_egress=>[
{
:from_port=>nil,
:ip_protocol=>"-1",
:ip_ranges=>[
{
:cidr_ip=>"0.0.0.0/0",
:description=>nil
}
],
:ipv_6_ranges=>[],
:prefix_list_ids=>[],
:to_port=>nil,
:user_id_group_pairs=>[]
}
],
:tags=>[],
:vpc_id=>"vpc-d817c1b3"
}
],
:next_token=>nil
}
# And this is a target value, that you can store in another one,
# return from method or simply print to output
security_group.dig(:security_groups)
.try(:[], 0)
.dig(:group_id)
=> "sg-0c2c5f219f1bafc1a"
但是如果您需要在包含多个元素的数组中进行搜索,Ruby's Enumerable module 中的方法可能会有所帮助(例如 select
或 reject
)。
UPDATE 与 OpenStruct,如果您更喜欢使用点符号的此类方法调用:
json = security_group.to_json
os = JSON.parse(json, object_class: OpenStruct)
os.security_groups.first.group_id
=> "sg-0c2c5f219f1bafc1a"
如何从 returned 对象打印 group_id
?
以下是return从一个函数中编辑出来的。我想打印 group_id
或 return group_id
{
:security_groups=>[
{
:description=>"Created By ManageIQ",
:group_name=>"MIQ_019",
:ip_permissions=>[
{
:from_port=>22,
:ip_protocol=>"tcp",
:ip_ranges=>[
{
:cidr_ip=>"0.0.0.0/0",
:description=>nil
}
],
:ipv_6_ranges=>[],
:prefix_list_ids=>[],
:to_port=>22,
:user_id_group_pairs=>[]
}
],
:owner_id=>"943755119718",
:group_id=>"sg-0c2c5f219f1bafc1a",
:ip_permissions_egress=>[
{
:from_port=>nil,
:ip_protocol=>"-1",
:ip_ranges=>[
{
:cidr_ip=>"0.0.0.0/0",
:description=>nil
}
],
:ipv_6_ranges=>[],
:prefix_list_ids=>[],
:to_port=>nil,
:user_id_group_pairs=>[]
}
],
:tags=>[],
:vpc_id=>"vpc-d817c1b3"
}
],
:next_token=>nil
}
这是函数:我要return security_group.group_id
def describe_security_group (
group_name
)
ec2 = get_aws_client
security_group = ec2.describe_security_groups(
filters: [
{name: 'group-name', values: [ group_name ]}]
)
puts "Describing security group '#{group_name}' with ID " \
"'#{security_group}'"
return security_group
rescue StandardError => e
puts "Error describing security group: #{e.message}"
return
end
所以,返回值看起来像一个散列,或者你可以让它完全散列。
对于 one-element 数组的情况,您可以简单地使用 ruby dig 方法。
根据您的数据和下面的评论,我们可以像这样访问所需的元素:
# from your ec2 api call
security_group = ec2.describe_security_groups(...)
# Result value is stored in `security_group` variable,
# and looks exactly like hash below
{
:security_groups=>[
{
:description=>"Created By ManageIQ",
:group_name=>"MIQ_019",
:ip_permissions=>[
{
:from_port=>22,
:ip_protocol=>"tcp",
:ip_ranges=>[
{
:cidr_ip=>"0.0.0.0/0",
:description=>nil
}
],
:ipv_6_ranges=>[],
:prefix_list_ids=>[],
:to_port=>22,
:user_id_group_pairs=>[]
}
],
:owner_id=>"943755119718",
:group_id=>"sg-0c2c5f219f1bafc1a",
:ip_permissions_egress=>[
{
:from_port=>nil,
:ip_protocol=>"-1",
:ip_ranges=>[
{
:cidr_ip=>"0.0.0.0/0",
:description=>nil
}
],
:ipv_6_ranges=>[],
:prefix_list_ids=>[],
:to_port=>nil,
:user_id_group_pairs=>[]
}
],
:tags=>[],
:vpc_id=>"vpc-d817c1b3"
}
],
:next_token=>nil
}
# And this is a target value, that you can store in another one,
# return from method or simply print to output
security_group.dig(:security_groups)
.try(:[], 0)
.dig(:group_id)
=> "sg-0c2c5f219f1bafc1a"
但是如果您需要在包含多个元素的数组中进行搜索,Ruby's Enumerable module 中的方法可能会有所帮助(例如 select
或 reject
)。
UPDATE 与 OpenStruct,如果您更喜欢使用点符号的此类方法调用:
json = security_group.to_json
os = JSON.parse(json, object_class: OpenStruct)
os.security_groups.first.group_id
=> "sg-0c2c5f219f1bafc1a"