I pass my template a TreeSet with Strings. However, when I loop over the set like this:
#(usernames : TreeSet[String])
#for( name <- usernames){
#name ,
}
However, the names are never printed in the correct order.
How can I iterate over my set in my template and print the names in order?
This has something to do with the way Scala Templates work. I suspect your TreeSet collection is under the hood mapped to a different collection and as a result the ordering is not preserved.
There is clearly a difference between the behavior of the Scala for loop and the for loop in Scala Templates. If you run your code as regular Scala code the order of the TreeSet is obviously preserved:
val users = TreeSet("foo", "bar", "zzz", "abc")
for (user <- users) {
println(user)
}
One of the ways to solve the problem is to use the iterator in the Scala Template:
#for(name <- usernames.iterator) {
#name ,
}
or transform the TreeSet to a sequence:
#for(name <- usernames.toSeq) {
#name ,
}
There is no guaranteed ordering for any Set class, so it's best to sort it before iterating.
If you mean to print them alphabetically, you should convert it into a List and then iterate
#(usernames : TreeSet[String])
#for( name <- usernames.toList().sortWith(_ < _)){
#name ,
}
Related
StructKeyList() will give me list of struct key with comma delimited. Now I need to get struct value with comma delimited. Right now this is what I'm doing to get value
<cfloop collection="#form#" item="key" >
#form[key]#,
</cfloop>
How can I get list of value from struct without loop? Thanks in advance.
I go through your problem. As per my knowledge is not possible to get list of value in structure within single functions. We have to loop the key and get the value of each. But I can give a solution for to get struct value with comma delimited.
<cfset strNew = {"a":"10","b":20,"c":30}>
Here strNew is my sample structure.
<cfset myList = ''>
<cfloop collection="#strNew#" item="key" >
<cfset myList = listappend(myList,structfind(strNew,key))>
</cfloop>
<cfdump var="#myList#" />
Here I've loop over the structure keys and find the value of an particular key and append that in to and list by using listappend and structfind functions.
So you no need to put like #structure[key]#,In your end of comma(,) is also added the last value of key too. For example your code should return 10,20,30,.
So you no need to do like that. use structfind and listappend you can avoid end of the comma also. Hope it's help you.
Since you're using CF2016, if you want to avoid a loop, you can always use one of the higher-order functions like reduce().
fields = formScope.reduce( function(result, key, value) {
result.append(value) ;
return result ;
}, [] ) ;
This takes the struct of your form scope (formscope) and uses reduce() to step through it and take it down to a single value (which is the struct values turned into an array). Then we make the returned array into a list.
writeDump( fields.toList() )
My full test code is at https://trycf.com/gist/f00cc62cd4631f44070faf8008e6788f/acf2016?theme=monokai
<cfscript>
formScope = {
empty1 : "" ,
fieldl : "text1" ,
field2 : "text2" ,
empty2 : "" ,
field3 : "text3" ,
field4 : "text4" ,
empty3 : ""
} ;
fields = formScope?.reduce( function(result, key, value) {
len(value) ? result.append(value) : "" ;
return result ;
}, [] ) ;
writeDump( fields?.toList() ?: "Form doesn't exist." ) ;
</cfscript>
Giving us: text2,text3,text4,text1.
formScope is my simulated version of the form fields that would be passed to this page. I use mostly the member function versions of StructReduce, ArrayAppend and ArrayToList. I also use the initialVal optional parameter to initialize the reduction's result value as an array. I check that the value has a length (I could also trim if needed) before I insert a row in the array, allowing me to remove empty elements from my final list. I also use the safe navigation operator (?.) to do some basic validation to make sure the elements exist (like if the form didn't pass or the reduction produced invalid results) and to make it more error-resistant.
NOTE: I believe that can be taken back to be compatible with CF11, when ArrayReduce was introduced.
https://helpx.adobe.com/coldfusion/cfml-reference/coldfusion-functions/functions-s/structreduce.html
http://ryanguill.com/functional/higher-order-functions/2016/05/18/higher-order-functions.html
https://helpx.adobe.com/coldfusion/cfml-reference/coldfusion-functions/functions-a-b/arraytolist.html
I'm using grails2.4.4 with mongodb plugin version 3.0.3. I'm facing issue while getting results of my domain object. I'm using below code:
My domain:
Employee{
ObjectId id
String name
}
I have list of ids , using below code to fetch employees: (Please note that below data is just for representing my problem. In realtime, my ids are random and so i can't use sorting, but i just want the result in the order of input.)
def idsList=[new ObjectId("2001"), new ObjectId("2002"), new ObjectId("2003")]
def results=Employee.findAllByIdInList(idsList)
Expected result:
[Employee#2001,Employee#2002,Employee#2003]
Actual result (not in order):
[Employee#2002, Employee#2003 , Employee#2001] or sometimes
[Employee#2003, Employee#2001 , Employee#2002]
For now i'm doing like this to get the output in desired order:
def results=[]
for(id in idsList){
def emp=Employee.findById(id)
results<<emp
}
But i want to do this with single call(findAllBy*InList) without iterating over objects. Can anyone advise how can i get the results in the order of input ids?
Have you tried
Employee.findAllByIdInList(idsList, [sort: 'id', order:'asc'])
? It should work as expected
If it doesn't, instead of for loop you can use
def result = idList.collect { id -> Employee.findById(id) }
I've got a list of complex objects that I want to display, grouped by one of its attribute in a Play 2 template.
I managed to do it :
#measures.groupBy(_.question.category).map {
case (category, items) => {
// Category stuff
#for(item <- items) {
// List of items
}
}
}
The problem is that the list was sorted in my Java controller, but the keyset of the map that I create is not sorted anymore (I would like to sort the key set using something like _.question.category.order).
Is there a way to have a sorted map on this attribute?
Thanks !
What type is measures? Did you try to use a LinkedHashSet? This should keep the elements order in contrast to e.g. a HashSet.
I am trying to collect some objects in Drools, but I want to only collect objects which have the same attribute. To wit, imagine a TestData class:
public class TestData {
int number;
String name;
//Getters, setters, rest of class
}
I want to use collect to get all TestDatas which have the same name. For the following data set, I want a rule which can collect the first two (both having the name 'Test1') and the second two ('Test2') as separate collections.
custom.package.TestData< number: 1, name:'Test1' >
custom.package.TestData< number: 2, name:'Test1' >
custom.package.TestData< number: 3, name:'Test2' >
custom.package.TestData< number: 4, name:'Test2' >
Something like
rule "Test Rule"
when
$matchingTestDatas : ArrayList( size > 1 ) from collect ( TestData( *magic* ) )
then
//Code
end
But obviously that won't work without the magic- it gets me an array of all the TestData entries with every name. I can use that as the basis for a rule, and do extended processing in the right hand side iterating over all the test data entries, but it feels like there should be something in drools which is smart enough to match this way.
Presumably the "magic" is just:
TestData( name == 'Test1' )
or
TestData( name == 'Test2' )
... for each of the collections. But that seems too obvious. Am I missing something?
Based on the clarification from the OP in the comments on this answer, it would appear that a Map of collections is required, keyed from the name. To support this, accumulate is required, rather than collect.
$tests: HashMap()
from accumulate( $test : TestData( name == $name ),
init( HashMap tests = new HashMap(); ),
action(
if (tests.get($name) == null) tests.put($name, new ArrayList();
tests.get($name).add($test);
),
reverse(
tests.get($name).remove($test);
),
result( tests )
);
How to use dot in field name ?
I see error in example:
db.test2.insert({ "a.a" : "b" })
can't have . in field names [a.a]
You can replace dot symbols of your field name to Unicode equivalent of \uff0E
db.test.insert({"field\uff0ename": "test"})
db.test.find({"field\uff0ename": "test"}).forEach(printjson)
{ "_id" : ObjectId("5193c053e1cc0fd8a5ea413d"), "field．name" : "test" }
See more:
http://docs.mongodb.org/manual/faq/developers/#faq-dollar-sign-escaping
http://docs.mongodb.org/manual/core/document/#dot-notation
Actualy you may use dots in queries. See: http://www.mongodb.org/display/DOCS/Dot+Notation+%28Reaching+into+Objects%29
Because of this special dot symbol mean you cannot use it in field names. Like you cannot use dot symbol in identifiers in most of programming languages.
You may write query db.test2.find({ "a.a" : "b" }) but if you want to be able to write such a query you need to insert your object like so: db.test2.insert({"a": {"a": "b"}}). This will create document with the field named "a" with the value of embeded document containing the field named "a" (again) with the value "b".
You can also write a SONManipulator using the pymongo library that transforms the data going to and back out of mongodb. There are downsides; there is a performance hit (impact depends on your use case) and you have to transform your keys when you do searches using find.
Here's code with an example of how to use it in the comment for the KeyTransform class:
from pymongo.son_manipulator import SONManipulator
class KeyTransform(SONManipulator):
"""Transforms keys going to database and restores them coming out.
This allows keys with dots in them to be used (but does break searching on
them unless the find command also uses the transform).
Example & test:
# To allow `.` (dots) in keys
import pymongo
client = pymongo.MongoClient("mongodb://localhost")
db = client['delete_me']
db.add_son_manipulator(KeyTransform(".", "_dot_"))
db['mycol'].remove()
db['mycol'].update({'_id': 1}, {'127.0.0.1': 'localhost'}, upsert=True,
manipulate=True)
print db['mycol'].find().next()
print db['mycol'].find({'127_dot_0_dot_0_dot_1': 'localhost'}).next()
Note: transformation could be easily extended to be more complex.
"""
def __init__(self, replace, replacement):
self.replace = replace
self.replacement = replacement
def transform_key(self, key):
"""Transform key for saving to database."""
return key.replace(self.replace, self.replacement)
def revert_key(self, key):
"""Restore transformed key returning from database."""
return key.replace(self.replacement, self.replace)
def transform_incoming(self, son, collection):
"""Recursively replace all keys that need transforming."""
for (key, value) in son.items():
if self.replace in key:
if isinstance(value, dict):
son[self.transform_key(key)] = self.transform_incoming(
son.pop(key), collection)
else:
son[self.transform_key(key)] = son.pop(key)
elif isinstance(value, dict): # recurse into sub-docs
son[key] = self.transform_incoming(value, collection)
return son
def transform_outgoing(self, son, collection):
"""Recursively restore all transformed keys."""
for (key, value) in son.items():
if self.replacement in key:
if isinstance(value, dict):
son[self.revert_key(key)] = self.transform_outgoing(
son.pop(key), collection)
else:
son[self.revert_key(key)] = son.pop(key)
elif isinstance(value, dict): # recurse into sub-docs
son[key] = self.transform_outgoing(value, collection)
return son
def remove_dots(data):
for key in data.keys():
if type(data[key]) is dict: data[key] = remove_dots(data[key])
if '.' in key:
data[key.replace('.', '\uff0E')] = data[key]
del data[key]
return data
this recursive method replaces all dot characters from keys of a dict with \uff0E
as suggested by Fisk
I replaced the key value using myString.replace(".","\u2024") before inserting it into the JsonObject.
Initially I used a simple recursion to replace all "." characters with its unicode equivalent but figured it out that even the dots in the values was getting replaced. So I thought that we should replace the dots only from keys and made the changes accordingly in case "if isinstance(input, dict)".
I thought it should be a sufficient condition to do the magic but I forgot that dict value can also be a dict or a list and then I finally added that check that if value of a dict was not string then, go inside recursively and was finally able to come up with this solution which eventually did the trick.
def remove_dots(data):
if isinstance(data, dict):
return {remove_dots(key): value if isinstance(value, str) else remove_dots(value) for key,value in data.iteritems()}
elif isinstance(data, list):
return [remove_dots(element) for element in data]
elif isinstance(data, str):
return data.replace('.','\u002e')
else:
return data
I've only really come across this problem when trying to serialize Dictionaries and such where the offending dot can appear as a key name.
Edited to show the references.
The quick and dirty C# approach:
using MongoDB.Bson;
using Newtonsoft.Json.Linq;
using System.Text.RegularExpressions;
public static T Sanitize<T>(T obj)
{
var str = JObject.FromObject(obj).ToJson();
var parsed = Regex.Replace(str, #"\.(?=[^""]*"":)", "_"); //i.e. replace dot with underscore when found as a json property name { "property.name": "don't.care.what.the.value.is" }
return JObject.Parse(parsed).ToObject<T>();
}