Question

EDIT:
I have somewhat distilled the question.

mongo_documents = mongo_collection.find({"medicalObjectId": "269"})
print "\n\n"
for this_document in mongo_documents:
    print this_document

print "-------------------------"

pqr = 269
mongo_documents2 = mongo_collection.find({"medicalObjectId": pqr})
print "\n\n"
for this_document2 in mongo_documents2:
    print this_document2

My problem is that the first code chunk where I use the number as the key in the query, works. But the second chunk where I use the variable, i get no output.

---

I am a beginner at python and pymongo, so please bear with me.

I have a list as;
row = [1, 2, …., 100]

I want to query a mongodb collection for each entry in my list.
The collection has the format:
collection = {‘pk’, ‘attribute1’, ‘attribute2’, ‘attribute3’}

I want to call the mongodb connection and iterate through each entry in my list with row[i]=pk and return the other attributes as the output.

ie. mongo_documents = mongo_collection.find({‘pk’ : row[0]})
mongo_documents = mongo_collection.find({‘pk’ : row[1]})
and so on.

The code that I have is:

for row in result_set:
    print row[0]
    mongo_documents = mongo_collection.find({'medicalObjectId' : row[0]})
    print mongo_documents
    for this_document in mongo_documents:
        print "----------------------------------"
        print this_document

however i get no output. where am I going wrong?
if i print mongo_documents, i get

    <pymongo.cursor.Cursor object at 0xe43150>

Answer 1

You could use the $in operator of mongodb to fetch all the rows at once and iterate through them.

mongo_documents = mongo_collection.find({ 'medicalObjectId' : { '$in' : result_set } } );
for doc in mongo_documents:
    print mongo_documents

I have not tested it, comment below if it doesnt work.

EDIT

mongo_documents2 = mongo_collection.find({"medicalObjectId": str(pqr)}) 
print "\n\n" 
for this_document2 in mongo_documents2: 
    print this_document2