读复杂JSON数据作为数据帧中的R

Question

我有以下JSON数据：

json_data <- data.frame(changedContent=c('{"documents":[],"images":[],"profileCommunications":[],"shortListedProfiles":[],"matrimonyUser":{"createdBy":null,"parentMatrimonyUserId":0,"userSalutationVal":"Mr.","matrimonyUserCode":"173773","matrimonyUserName":"SUDIPTO DEB BARMAN","emailAddress":"sudipto06@yahoo.com","contactNumber":"9434944429","emailOTP":"","mobilePhoneOTP":"","isEmailOTPVerified":1,"isMobilePhoneOTPverified":1,"isHideContact":null,"isHideEmail":null,"lastLogInTime":null,"userSessionDtlId":null,"modifiedBy":4444,"modifiedOn":1440167133028,"isDeleted":null,"isActive":1,"isAllowedLogin":null,"numberOfChildProfile":null,"matrimonyUserTypeId":100000006,"matrimonyUserTypeVal":"Online Customer","onlineStatusFlag":null,"lastSystemTransactionDateTime":null,"isLive":null,"mobileCountryCode":0,"userStatusIdValue":"Registered and 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ligionVal":"Hindu","motherTongueVal":"Bengali","marryOutsideCasteVal":"","isSocialMediaVerified":null,"numChildrenProspectVal":null,"locality":null},"profilePhysicalAttributesDtl":{"createdBy":4444,"userSessionDtlId":null,"modifiedBy":4444,"modifiedOn":1440167133110,"isDeleted":null,"isActive":1,"hivId":0,"bodyTypeId":0,"complexionId":0,"bloodGroupId":0,"userId":165614,"createdOn":1440167133110,"height":null,"isPreferredPartnerDtl":null,"hairColourId":0,"eyeColourId":0,"hairLengthId":0,"physicalStatusId":null,"disabilitiesVal":"","hivVal":"","knownAilmentVal":"","bodyTypeVal":null,"complexionVal":null,"hairColourVal":"","eyeColourVal":"","hairLengthVal":"","physicalStatusVal":null,"bloodGroupVal":null,"profilePhysicalAttributesDtlId":2757,"weight":null},"profileSiblingsDtl":null,"profileImageDtl":null,"notes":[{"createdBy":4444,"modifiedBy":4444,"modifiedOn":1440167133115,"isDeleted":null,"isActive":1,"userId":165614,"createdOn":1440167133115,"profileNotesDtlId":3499,"notesDescription":""}],"references":[],"relationOthers":[],"photoIdentificationDetails":null,"preModAboutMes":[{"answer":"null 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

我想把上述转换为方便的数据帧与1行的每个MatrimonyUserId在above.I已经尝试了几个事情，但无法得到所需的格式。

Answer 1

假设你可以缠斗JSON数据到嵌套列表....

x <- jsonlite::fromJSON(jsontext) 

我发现它是最容易通过使用管道运营商，并经常检查结构解析复杂的列表结构（仅限于1级或2级。

str1 <- function(x) str(x, 1) 
str2 <- function(x) str(x, 2) 

# for pipe operator 
library("magittr") 

x %>% str1 
x %>% .[[1]] %>% str2 

等等