免责声明:这不是家庭作业,这是我正在为工作做的事情的净化版本。
我正在尝试使用 jq 过滤一些 json 数据,并希望为过滤器中的每个匹配记录返回一个对象。这是我正在做的事情的文本描述:“给定一个 JSON 对象,其中包含学生列表、一些个人信息和他们的成绩,返回一个包含每个学生的姓名、年龄和累积 gpa 的列表CSC101。”
这是测试 JSON 对象(程序输入):
{
"students": [
{"name": "John", "age": "19", "gender": "m", "from": "Tampa, FL", "cum_gpa": "3.83", "semesters": [
{"name": "201302", "gpa": "3.67", "grades": {"CSC101": "A", "MAT101": "A", "PSY101": "B"}},
{"name": "201401", "gpa": "4.00", "grades": {"CSC201": "A", "MAT201": "A", "HIS101": "A"}}
]},
{"name": "Mary", "age": "20", "gender": "f", "from": "Chicago, IL", "cum_gpa": "3.50", "semesters": [
{"name": "201302", "gpa": "4.00", "grades": {"CSC101": "A", "MAT101": "A", "ECO101": "A"}},
{"name": "201401", "gpa": "3.00", "grades": {"CSC201": "B", "MAT201": "B", "HUM101": "B"}}
]},
{"name": "Dan", "age": "20", "gender": "m", "from": "Seattle, WA", "cum_gpa": "3.33", "semesters": [
{"name": "201302", "gpa": "3.33", "grades": {"CHE101": "B", "MAT101": "A", "PSY101": "B"}},
{"name": "201401", "gpa": "3.33", "grades": {"CHE201": "A", "MAT201": "A", "HUM101": "C"}}
]}
]
}
这是我当前的过滤器表达式和结果:
cat test.json |jq -c '.students[]|select(.semesters[].grades.CSC101 == "A")|{name: .name, age: .age, gpa: .cum_gpa, CSC101: .semesters[].grades.CSC101}'
{"name":"John","age":"19","gpa":"3.83","CSC101":"A"}
{"name":"John","age":"19","gpa":"3.83","CSC101":null}
{"name":"Mary","age":"20","gpa":"3.50","CSC101":"A"}
{"name":"Mary","age":"20","gpa":"3.50","CSC101":null}
它有点工作,但它会产生额外的输出。我只希望它产生具有 CSC101 条目的学期,而是返回任何参加 CSC101 的学生的所有学期。有什么建议么?