MongoDB Console - Find & pull object in an array based on nested object with regex [duplicate] - mongodb

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This question already has an answer here:
Updating/Pulling a value in an Array contained in a Subdocument Array in Mongodb/Mongoose
(1 answer)
Closed 3 years ago.
I have run into a problem where I need to delete some entries in my database based on a regexp that looks for an 'x' char in the value of the field. This is my data structure:
{
"_id" : ObjectId("5e0effac04d45483d97cb4c3"),
"formId" : ObjectId("5d076f7db166bcae2743554a"),
"revisionNo" : 0,
"customerUserId" : ObjectId("5d0889fde55fbc38509e5825"),
"formElements" : [
{
"formElementId" : ObjectId("5d1a047cae7a711848238c26"),
"type" : "text",
"label" : "Intersection number",
"value" : null,
"dynamicTypeData" : {
"required" : false,
"value" : "TK47ax"
}
},
{
"formElementId" : ObjectId("5d1a058cae7a711848238c27"),
"type" : "select",
"label" : "Municipality",
"value" : null,
"dynamicTypeData" : {
"attributes" : null,
"options" : [
],
"required" : false
}
},
{
"formElementId" : ObjectId("5d00ec9a9001eb637c8466f4"),
"type" : "select",
"label" : "Signtype for setup",
"value" : null,
"dynamicTypeData" : {
"attributes" : null,
"options" : [
],
"required" : false
}
},
{
"formElementId" : ObjectId("5d00ee749001eb637c8466fc"),
"type" : "select",
"label" : "Sign size",
"value" : null,
"dynamicTypeData" : {
"attributes" : null,
"options" : [
],
"required" : false
}
},
{
"formElementId" : ObjectId("5d00eced9001eb637c8466f5"),
"type" : "select",
"label" : "Route number",
"value" : null,
"dynamicTypeData" : {
"attributes" : null,
"options" : [
],
"required" : false
}
},
{
"formElementId" : ObjectId("5d00eeba9001eb637c8466fe"),
"type" : "select",
"label" : "Stand",
"value" : null,
"dynamicTypeData" : {
"attributes" : null,
"options" : [
],
"required" : false
}
},
{
"formElementId" : ObjectId("5d00ee849001eb637c8466fd"),
"type" : "select",
"label" : "Foundation",
"value" : null,
"dynamicTypeData" : {
"attributes" : null,
"options" : [
],
"required" : false
}
},
{
"formElementId" : ObjectId("5d00ed0f9001eb637c8466f6"),
"type" : "textarea",
"label" : "Remarks regaring the new signs placement",
"value" : null,
"dynamicTypeData" : {
"value" : null,
"required" : false
}
}
]
}
So what I want to find is every element matches the label: "Intersection number" with a value that contains the char x in their dynamicTypeData object. I'm aware that I can in the console do something like: db.getCollection('formRegistrations').find({formId: ObjectId("5d0889fde55fbc38509e5825")}) but how to get all the way down to thedynamicTypeData` object and match with the value in that, I have no idea. Please Help :) Thanks for reading
EDIT
While the given answer is correct I still only wanted to find the given registrations with those parameters, because I had to manually review the data before deletion since this was done on a production ser. So from the answer given below I formulated my own script:
db.formRegistrations.find(
{
formId: ObjectId("5d076f7db166bcae2743554a"),
"formElements.0.label": "Intersection number",
"formElements.0.dynamicTypeData.value": {
$regex: /.*x/
}
}
)
Hope this helps someone other than myself

Answer 1

To remove the formElements matching a specific label and dynamicTypeData(child elements) value, this should work :
db.formRegistrations.update({ _id: <the id> }, {
$pull: {
formElements: {
"label": "Intersection number",
"dynamicTypeData.value": {
$regex: /^.*?x.*$/,
$options: "i"
}
}
}
})