我正在和ruby和sinatra一起工作。使用Plivo api，我想访问返回的数据，遍历它并提取并打印一些元素的所有实例，并在我的网页上以HTML格式打印出来。
我的红宝石代码是：
user_key = 'my_key'
params = { 'account' => user_key }
response = p.get_cdrs(params)
obj = response.last.to_json
在Firebug控制台中返回以下内容：
{
"api_id":"c59f2008-5baf-11e3-bbb2-22000ac522d1",
"meta":{
"limit":20,
"next":"/v1/Account/MAMTE4MTHJNJRKODBIMD/Call/?account=MAMTE4MTHJNJRKODBIMD&limit=20&offset=20",
"offset":0,
"previous":null,
"total_count":114
},
"objects":[
{
"bill_duration":21,
"billed_duration":60,
"call_direction":"outbound",
"call_duration":21,
"call_uuid":"103a3bc6-5baa-11e3-a878-f30f0e86751e",
"end_time":"2013-12-03 08:33:44+09:00",
"from_number":"85258081345",
"parent_call_uuid":"0313c23c-5baa-11e3-a673-f30f0e86751e",
"resource_uri":"/v1/Account/MAMTE4MTHJNJRKODBIMD/Call/103a3bc6-5baa-11e3-a878-f30f0e86751e/",
"to_number":"14157638148",
"total_amount":"0.01200",
"total_rate":"0.01200"
},
{
"bill_duration":21,
"billed_duration":60,
"call_direction":"inbound",
"call_duration":21,
"call_uuid":"0313c23c-5baa-11e3-a673-f30f0e86751e",
"end_time":"2013-12-03 08:33:44+09:00",
"from_number":"sip:hechan131129083410@phone.plivo.com",
"parent_call_uuid":null,
"resource_uri":"/v1/Account/MAMTE4MTHJNJRKODBIMD/Call/0313c23c-5baa-11e3-a673-f30f0e86751e/",
"to_number":"14157638148",
"total_amount":"0.00300",
"total_rate":"0.00300"
},
{
"bill_duration":358,
"billed_duration":360,
"call_direction":"inbound",
"call_duration":358,
"call_uuid":"0b07abb2-5b40-11e3-8fb1-057cf5362a5f",
"end_time":"2013-12-02 19:59:58+09:00",
"from_number":"441903773807",
"parent_call_uuid":null,
"resource_uri":"/v1/Account/MAMTE4MTHJNJRKODBIMD/Call/0b07abb2-5b40-11e3-8fb1-057cf5362a5f/",
"to_number":"441903337012",
"total_amount":"0.04800",
"total_rate":"0.00800"
},
{
"bill_duration":344,
"billed_duration":360,
"call_direction":"outbound",
"call_duration":344,
"call_uuid":"116d89f4-5b40-11e3-8fe5-057cf5362a5f",
"end_time":"2013-12-02 19:59:57+09:00",
"from_number":null,
"parent_call_uuid":"0b07abb2-5b40-11e3-8fb1-057cf5362a5f",
"resource_uri":"/v1/Account/MAMTE4MTHJNJRKODBIMD/Call/116d89f4-5b40-11e3-8fe5-057cf5362a5f/",
"to_number":"sip:niyan130903202713@phone.plivo.com",
"total_amount":"0.01800",
"total_rate":"0.00300"
},
{
"bill_duration":27,
"billed_duration":60,
"call_direction":"outbound",
"call_duration":27,
"call_uuid":"1b026a9a-5b3e-11e3-898e-1b5c95282229",
"end_time":"2013-12-02 19:40:46+09:00",
"from_number":"85258081345",
"parent_call_uuid":"19f8572c-5b3e-11e3-8930-1b5c95282229",
"resource_uri":"/v1/Account/MAMTE4MTHJNJRKODBIMD/Call/1b026a9a-5b3e-11e3-898e-1b5c95282229/",
"to_number":"441903773807",
"total_amount":"0.01900",
"total_rate":"0.01900"
},
{
"bill_duration":27,
"billed_duration":60,
"call_direction":"inbound",
"call_duration":27,
"call_uuid":"19f8572c-5b3e-11e3-8930-1b5c95282229",
"end_time":"2013-12-02 19:40:46+09:00",
"from_number":"sip:hechan131129083410@phone.plivo.com",
"parent_call_uuid":null,
"resource_uri":"/v1/Account/MAMTE4MTHJNJRKODBIMD/Call/19f8572c-5b3e-11e3-8930-1b5c95282229/",
"to_number":"441903773807",
"total_amount":"0.00300",
"total_rate":"0.00300"
},
{
"bill_duration":175,
"billed_duration":180,
"call_direction":"inbound",
"call_duration":175,
"call_uuid":"e59e46f6-5b3a-11e3-8488-1b5c95282229",
"end_time":"2013-12-02 19:20:16+09:00",
"from_number":"sip:hechan131129083410@phone.plivo.com",
"parent_call_uuid":null,
"resource_uri":"/v1/Account/MAMTE4MTHJNJRKODBIMD/Call/e59e46f6-5b3a-11e3-8488-1b5c95282229/",
"to_number":"441903773807",
"total_amount":"0.00900",
"total_rate":"0.00300"
},
{
"bill_duration":175,
"billed_duration":180,
"call_direction":"outbound",
"call_duration":175,
"call_uuid":"e698b528-5b3a-11e3-84e1-1b5c95282229",
"end_time":"2013-12-02 19:20:16+09:00",
"from_number":"85258081345",
"parent_call_uuid":"e59e46f6-5b3a-11e3-8488-1b5c95282229",
"resource_uri":"/v1/Account/MAMTE4MTHJNJRKODBIMD/Call/e698b528-5b3a-11e3-84e1-1b5c95282229/",
"to_number":"441903773807",
"total_amount":"0.05700",
"total_rate":"0.01900"
},
{
"bill_duration":728,
"billed_duration":780,
"call_direction":"outbound",
"call_duration":728,
"call_uuid":"b421ca72-5b34-11e3-82c5-1b5c95282229",
"end_time":"2013-12-02 18:45:04+09:00",
"from_number":"85258081345",
"parent_call_uuid":"b3210c64-5b34-11e3-8250-1b5c95282229",
"resource_uri":"/v1/Account/MAMTE4MTHJNJRKODBIMD/Call/b421ca72-5b34-11e3-82c5-1b5c95282229/",
"to_number":"85265001927",
"total_amount":"0.33800",
"total_rate":"0.02600"
},
{
"bill_duration":728,
"billed_duration":780,
"call_direction":"inbound",
"call_duration":728,
"call_uuid":"b3210c64-5b34-11e3-8250-1b5c95282229",
"end_time":"2013-12-02 18:45:04+09:00",
"from_number":"sip:hechan131129083410@phone.plivo.com",
"parent_call_uuid":null,
"resource_uri":"/v1/Account/MAMTE4MTHJNJRKODBIMD/Call/b3210c64-5b34-11e3-8250-1b5c95282229/",
"to_number":"85265001927",
"total_amount":"0.03900",
"total_rate":"0.00300"
},
{
"bill_duration":800,
"billed_duration":840,
"call_direction":"outbound",
"call_duration":800,
"call_uuid":"49c4bc6a-5b30-11e3-aa2e-f30f0e86751e",
"end_time":"2013-12-02 18:14:41+09:00",
"from_number":"85258081345",
"parent_call_uuid":"43465b3c-5b30-11e3-a842-f30f0e86751e",
"resource_uri":"/v1/Account/MAMTE4MTHJNJRKODBIMD/Call/49c4bc6a-5b30-11e3-aa2e-f30f0e86751e/",
"to_number":"818042010550",
"total_amount":"2.01600",
"total_rate":"0.14400"
},
{
"bill_duration":800,
"billed_duration":840,
"call_direction":"inbound",
"call_duration":800,
"call_uuid":"43465b3c-5b30-11e3-a842-f30f0e86751e",
"end_time":"2013-12-02 18:14:41+09:00",
"from_number":"sip:hechan131129083410@phone.plivo.com",
"parent_call_uuid":null,
"resource_uri":"/v1/Account/MAMTE4MTHJNJRKODBIMD/Call/43465b3c-5b30-11e3-a842-f30f0e86751e/",
"to_number":"818042010550",
"total_amount":"0.04200",
"total_rate":"0.00300"
},
{
"bill_duration":2,
"billed_duration":60,
"call_direction":"outbound",
"call_duration":2,
"call_uuid":"7f1db12e-5a7b-11e3-9c03-c7a22946c980",
"end_time":"2013-12-01 20:27:08+09:00",
"from_number":"185258081345",
"parent_call_uuid":"7e6225d0-5a7b-11e3-9bd4-c7a22946c980",
"resource_uri":"/v1/Account/MAMTE4MTHJNJRKODBIMD/Call/7f1db12e-5a7b-11e3-9c03-c7a22946c980/",
"to_number":"sip:hechan131129083410@phone.plivo.com",
"total_amount":"0.00300",
"total_rate":"0.00300"
},
{
"bill_duration":2,
"billed_duration":60,
"call_direction":"inbound",
"call_duration":2,
"call_uuid":"7e6225d0-5a7b-11e3-9bd4-c7a22946c980",
"end_time":"2013-12-01 20:27:08+09:00",
"from_number":"185258081345",
"parent_call_uuid":null,
"resource_uri":"/v1/Account/MAMTE4MTHJNJRKODBIMD/Call/7e6225d0-5a7b-11e3-9bd4-c7a22946c980/",
"to_number":"14154292111",
"total_amount":"0.00850",
"total_rate":"0.00850"
},
{
"bill_duration":1628,
"billed_duration":1680,
"call_direction":"outbound",
"call_duration":1628,
"call_uuid":"108c1c14-5a76-11e3-a749-1b5c95282229",
"end_time":"2013-12-01 20:15:25+09:00",
"from_number":"85258081345",
"parent_call_uuid":"0f78d9c0-5a76-11e3-a6af-1b5c95282229",
"resource_uri":"/v1/Account/MAMTE4MTHJNJRKODBIMD/Call/108c1c14-5a76-11e3-a749-1b5c95282229/",
"to_number":"441903773807",
"total_amount":"0.53200",
"total_rate":"0.01900"
},
{
"bill_duration":1628,
"billed_duration":1680,
"call_direction":"inbound",
"call_duration":1628,
"call_uuid":"0f78d9c0-5a76-11e3-a6af-1b5c95282229",
"end_time":"2013-12-01 20:15:25+09:00",
"from_number":"sip:hechan131129083410@phone.plivo.com",
"parent_call_uuid":null,
"resource_uri":"/v1/Account/MAMTE4MTHJNJRKODBIMD/Call/0f78d9c0-5a76-11e3-a6af-1b5c95282229/",
"to_number":"441903773807",
"total_amount":"0.08400",
"total_rate":"0.00300"
},
{
"bill_duration":57,
"billed_duration":60,
"call_direction":"outbound",
"call_duration":57,
"call_uuid":"ce7f25f6-5a6f-11e3-ae45-f30f0e86751e",
"end_time":"2013-12-01 19:04:37+09:00",
"from_number":"85258081345",
"parent_call_uuid":"c938e38e-5a6f-11e3-aca3-f30f0e86751e",
"resource_uri":"/v1/Account/MAMTE4MTHJNJRKODBIMD/Call/ce7f25f6-5a6f-11e3-ae45-f30f0e86751e/",
"to_number":"441903773807",
"total_amount":"0.01900",
"total_rate":"0.01900"
},
{
"bill_duration":57,
"billed_duration":60,
"call_direction":"inbound",
"call_duration":57,
"call_uuid":"c938e38e-5a6f-11e3-aca3-f30f0e86751e",
"end_time":"2013-12-01 19:04:37+09:00",
"from_number":"sip:hechan131129083410@phone.plivo.com",
"parent_call_uuid":null,
"resource_uri":"/v1/Account/MAMTE4MTHJNJRKODBIMD/Call/c938e38e-5a6f-11e3-aca3-f30f0e86751e/",
"to_number":"441903773807",
"total_amount":"0.00300",
"total_rate":"0.00300"
},
{
"bill_duration":126,
"billed_duration":180,
"call_direction":"outbound",
"call_duration":126,
"call_uuid":"24ed88a4-5a59-11e3-a462-fdc08976d83f",
"end_time":"2013-12-01 16:23:39+09:00",
"from_number":"185258081345",
"parent_call_uuid":"2445b890-5a59-11e3-a437-fdc08976d83f",
"resource_uri":"/v1/Account/MAMTE4MTHJNJRKODBIMD/Call/24ed88a4-5a59-11e3-a462-fdc08976d83f/",
"to_number":"818088931617",
"total_amount":"0.43200",
"total_rate":"0.14400"
},
{
"bill_duration":126,
"billed_duration":180,
"call_direction":"inbound",
"call_duration":126,
"call_uuid":"2445b890-5a59-11e3-a437-fdc08976d83f",
"end_time":"2013-12-01 16:23:39+09:00",
"from_number":"185258081345",
"parent_call_uuid":null,
"resource_uri":"/v1/Account/MAMTE4MTHJNJRKODBIMD/Call/2445b890-5a59-11e3-a437-fdc08976d83f/",
"to_number":"14154292111",
"total_amount":"0.02550",
"total_rate":"0.00850"
}
]
}
现在，我想访问数据的某些部分并以HTML格式打印出来，例如，所有bill_durations和所有call_directions。我怎样才能做到这一点？
当我尝试：
obj.each do |row|
bill_duration = ob["objects"][0]["bill_duration"]
halt 200, { :bill_duration => bill_duration }
end
heroku错误是：
NoMethodError - undefined method `each' for #<String:0x007f82e6448b38>
这里有什么问题？谢谢你们！
好的，这就是我现在拥有的：
response.last['objects'].each do |row|
bill_duration = row["bill_duration"]
halt 200, { :bill_duration => bill_duration }.to_json
end
这不会产生错误，但它只返回一条记录，尽管循环。我需要获得bill_duration的所有实例。
答案 0 :(得分：0)
实际上，.to_json会生成字符串，而不是哈希值，这就是您收到错误的原因。它在http://www.ruby-doc.org/stdlib-2.0/libdoc/json/rdoc/JSON.html#module-JSON-label-Generating+JSON
您可以将该字符串转换回JSON.parse的对象，也可以直接在response.last上操作。但是，在任何一种情况下，请注意该对象将是哈希，而不是数组，因此您必须先从中选择objects元素，然后才能开始迭代对象数组，如：
response.last['objects'].each
或
JSON.parse(obj)['objects'].each
答案 1 :(得分：0)
results = response.last['objects'].each do |row|
bill_duration = row["bill_duration"]
{ :bill_duration => bill_duration }
end
halt 200, results.to_json
end
然后可以使用jQuery访问和打印出来，如下所示：
$.getJSON("/callrecords", function(data) {
$.each( data, function( key, value ) {
var txt = '<p>' +this["bill_duration"]+ '</p>';
$(".results").append(txt);
});//end each
});//end JSON
太棒了，多年来我一直在努力奋斗。谢谢Peter !!