Based on this question I created a Groovy class that will have dynamic properties.
class MyDynamic {
def propertyMissing( String name, value ) {
this.metaClass."$name" = value
value
}
}
So far all good, now I can set some non-existent property with success
MyDynamic dyna = new MyDynamic()
dyna.someProp = new Date()
My problem begins when I have another instance with the same name of property, but with another type
MyDynamic dyna2 = new MyDynamic()
dyna2.someProp = "0" //GroovyCastException: Cannot cast object '0' with class 'java.lang.String' to class 'java.util.Date'
Actually I need this because I'm creating objects with the result of a query without knowing the table and the column. I get the name of the column with the ResultSetMetaData and add the property to the instance of the dynamic object. Later I will use this object to export all the properties and values. In different tables I have the same column name, but with different types.
So my question is: how can I reset this metaClass when I'm done with the instance to not conflict with other instance?
Why not a Expando, a Map or a simple container:
class Dynamic {
def properties = [:]
void setProperty( String name, value ) {
properties[name] = value
}
def getProperty(String property) { properties[property] }
}
d = new Dynamic()
d.name = "yeah"
assert d.name.class == String
d.name = new Date()
assert d.name.class == Date
Related
I thought this would have been easy but I am having issues ticking all the boxes that I need in this.
I need to
Serialize an object to Json
Ignore any properties not set
Use the ENum names instead of integer values
I have generated all the models for this using the Open API Generator based on a .yaml spec.
My first attempt was to get a bit of code from what looks like an old serializer
let json<'t> (myObj:'t) =
use ms = new MemoryStream()
let serialiser: DataContractJsonSerializer = new DataContractJsonSerializer(typeof<'t>)
let settings: DataContractJsonSerializerSettings = new DataContractJsonSerializerSettings()
(new DataContractJsonSerializer(typeof<'t>)).WriteObject(ms, myObj)
Encoding.Default.GetString(ms.ToArray())
This function actually does everything fine - except it copiess the enum numbers instead of names and I can't see an option to make this happpen.
My other attempt is using System.Text.Json.JsonSerializer:
let options
= new JsonSerializerOptions(
)
options.DefaultIgnoreCondition <- JsonIgnoreCondition.WhenWritingDefault
options.Converters.Add(new JsonStringEnumConverter(JsonNamingPolicy.CamelCase))
let jsonString:string = JsonSerializer.Serialize(shipmentRequest, options)
I have tried a few different things ( including excluding the Enum converter ) and I always get the following error.
Unable to cast object of type 'System.Int32' to type
'System.Nullable`1[Zimpla.Model.ExpressPackageReference+TypeCodeEnum]'
The specific Object ( roughly ) that it is having an issue with is:
[DataContract(Name = "ExpressPackageReference")]
public partial class ExpressPackageReference : IEquatable<ExpressPackageReference>, IValidatableObject
{
......etc
[DataMember(Name = "typeCode", EmitDefaultValue = false)]
public TypeCodeEnum? typeCode
{
get{ return _typeCode;}
set
{
_typeCode = value;
_flagtypeCode = true;
}
}
This particular property is not even set so it should be skipping over it theoretically. It is possible that I am not generating the object correctly
Without understanding all the details here, I think you are asking how you can serialize an object to json while omitting all properties that are null using System.Text.Json.
To accomplish that you have to set the following option:
options.IgnoreNullValues <- true
Here are the docs for this option:
https://learn.microsoft.com/en-us/dotnet/api/system.text.json.jsonserializeroptions.ignorenullvalues?view=net-5.0#System_Text_Json_JsonSerializerOptions_IgnoreNullValues
I am using ElasticSearch and attempting to create an index with a class that has a dynamic type property in it. This property may have strings or dates in it. When indexing, I have been using the code below:
dynamic instance = MyObject.GetDynamicJson();
var indexResponse = client.Index((object) instance, i=>i
.Index("myIndex")
.Type("MyObject")
);
Here's the code for GetDynamicJson().
MyObject has only Name and Value as properties. (apologies, I've had issues in the past with Elastic choking on json without all the quotes, which I have escaped with \ characters):
String json = "{ \"Name\":\" + Name + "\",\"DateValue\":\"";
try {
var date = DateTime.parse(Value);
json += DateTime.ToString("yyyy/MM/dd HH:mm:ss Z") + "\", \"Value\":\"\"}";
} catch { //If the DateTime parse fails, DateValue is empty and I'll have text in Value
json += "\",\"Value\":\"" + Value + "\"}";
}
return json;
For some reason it doesn't seem to like the string in DateValue and I definitely don't know why it's leaving out that property entirely in the error:
For whatever reason, ElasticSearch is completely dumping the DateValue property, doesn't seem to see the DateValue property at all.
I'm getting the error:
{"name":"CreatedDate","value":"2017-11-07T13:37:11.4340238-06:00"}
[indices:data/write/bulk[s][p]]"}],"type":"class_cast_exception","reason":"org.elasticsearch.index.mapper.TextFieldMapper cannot be cast to org.elasticsearch.index.mapper.DateFieldMapper"},"status":500
Later note: I have changed the index creator method to update the mapping. I added a third field to the Object, so now it has properties: Name, Value, DateValue:
public static void CreateRecordsIndex(ElasticClient client)
{
client.CreateIndex("myIndex", i => i
.Settings(s => s
.NumberOfShards(2)
.NumberOfReplicas(0)
)
.Mappings(x => x
.Map<MyObject>(m => m.AutoMap())));
}
Now, it is successfully mapping and creating a property each time, but it still seems to drop the property I am sending it in the json. It just sets them all to the default datetime: "dateValue": "0001-01-01T00:00:00". This is strange, because when making the dynamic instance I send to Elastic, I use only the MyObject.GetDynamicJson() method to build it. I no longer get the mapping error, but Elastic still seems oblivious to "dateValue":"some date here" in the object when it is set.
OK, I got rid of the dynamic object type (ultimately I wasn't actually getting data from the json method, I had a typo and Elastic was getting the original object directly - it's a wonder it was still handling it). So I let Elastic do the parse using its mapping. In order to do that, I first updated MyObject to include multiple properties, one for each type the incoming property could be (I am only handling text and dates in this case). For the DateValue property of MyObject, I have this:
public DateTime DateValue {
get
{
try
{
return DateTime.Parse(Value);
} catch
{
return new DateTime();
}
}
set
{
try {
DateValue = value;
} catch
{
DateValue = new DateTime();
}
}
}
Now, if Value is a date, my DateValue field will be set. Otherwise it'll have the default date (a very early date "0001-01-01T00:00:00"). This way, I can later search both for text against that dynamic field, or if a date is set, I can do date and date range queries against it (technically they end up in two different fields, but coming from the same injested data).
Key to this is having the index mapping setup, as you can see in this method from the question:
public static void CreateRecordsIndex(ElasticClient client)
{
client.CreateIndex("myIndex", i => i
.Settings(s => s
.NumberOfShards(2)
.NumberOfReplicas(0)
)
.Mappings(x => x
.Map<MyObject>(m => m.AutoMap())));
}
In order to recreate the index with the updated MyObject, I did this:
if (client.IndexExists("myIndex").Exists)
{
client.DeleteIndex("myIndex");
CreateRecordsIndex(client); //Goes to the method above
}
I need to get list of instances. I did so to do this:
def availableCafee = Cafee.list()
But now, my task is complicated. It requires if certain field in instance doesn't have an empty string value, other fields of the instance must be found via some controller and the other instance by this string value. Domain class is below.
If apiInit is empty, the instance added to list how in example above, if apiInit isn't empty, it assumed other fields wasn't initialized, so getting other fields requires via controller, which I've done and the other instance.So external API work is emulate. How to change example above to do this?
class Cafee {
String cafeeName = ""
int totalReservationPlaces = 0
double placeCost = 0
String currencyType = ""
boolean isReservationAvailable = false
boolean reservationTimeLimit = false
boolean reservationDateLimit = false
int totalPlaces = 0
LocalTime startTimeLimit = new LocalTime()
LocalTime endTimeLimit = new LocalTime()
Date startDateLimit = new Date()
Date endDateLimit = new Date()
String region = ""
String city = ""
String apiInit = ""
}
I think what you are trying to say is that a nullable object is causing the object not to be saved.
The solution is quite simple:
static constraints = {
apiInit nullable: true
}
Have a read here: rejected-value-null
So ideally set all those objects that are could be nullable should be set
ChatUser.groovy
you can also set the defaultValue of an object in the mapping:
MailingListBase.groovy
Please note if it is an already generated Database table any attempt now to set to nullable after it has been previously created will not work. you will either have to set this manually or drop it and let it regenerate..
I want to parse a string to date just before validate a command object, here is my command object code
class ActivitiesCommand {
List schools
List departments
Date from
Date to
static constraints = {
schools nullable:false
departments nullable:false
from blank:false
to blank:false
}
def beforeValidate() {
def from = new Date().parse("yyyy-MM-dd", from)
def to = new Date().parse("yyyy-MM-dd", to)
}
}
but i am getting java.lang.NullPointerException when i try def from = new Date().parse("yyyy-MM-dd", from) or def to = new Date().parse("yyyy-MM-dd", to). What can i do in order to successfully parse the date before validate command object?
I read the command object docs. I got this sample from there. I tried if removing ? beforeValidate does not work, so i understand i need to provide a null safe but i do not know how to do it in my scenario
class Person {
String name
static constraints = { name size: 5..45 }
def beforeValidate() { name = name?.trim() }
}
Thanks for your time.
from and to is set to Date in the Command Object, so request parameter string with from and to names will be converted to a Date and then bound to these field.
If the expected date format matches then binding will be successful.
In your case, from and to in beforeValidate is treated as String instead. If they are String actually then you can make them nullable: false in constraints or do the check as below in beforeValidate:
from = from ? Date.parse("yyyy-MM-dd", from) : new Date() - 1 //for example
Note the appropriate use of Date.parse()
Is there a generic way to retrieve PropertyInfo based on a string value alone, when deeper than one level.
I assume this is probably simple enough, but my search results are only as good as my search criteria, and I think I am having an issue articulating the proper keywords to get search results for what I am after.
I would like to be able to do something like the following (which works perfect if the key is for a direct property / one level - ie key = 'firstName'):
public static PropertyInfo (this HtmlHelper htmlHelper, string key) {
PropertyInfo pInfo = htmlHelper.ViewData.Model.GetType().GetProperty(key);
return pInfo;
}
But is there a way for me to return the PropertyInfo based on a string alone
when Key equals something more complex, such as nested classes, objects, lists, etc...:
key = "somelist[0].myproperty"
key = "Items[0].someotherlist[1].someproperty" (where Items is defined as List<Item> Items {get; set;}, someotherlist is defined similarly)
Can the method be generic enough to essentially drill down as many levels as needed (defined)?
So here is what I came up with... this is about to get wordy, and mostly 'stream of thought'
I have custom HtmlHelperExtension, and within it :
PropertyInfo[] pInfoArray = htmlHelper.ViewData.Model.GetType().GetProperties();
PropertyInfo pInfo = GetPropertyInfo(pInfoArray, key);
This GetPropertyInfo() method takes the key, and the PropertyInfo array, cycles through the properties, until the keypart (using regex to remove any indication of an array from the string, so I am left with only the property) matches the property name. On Match, determine if this is the first cycle in the loop, and if so assign the matched property to my Temp Type and PropertyInfo variables. If keyParts are remaining to loop through, subsequent loops now use previously set temp variables and the for loop index [i] to iterate / drill down the class structure. Each time setting the pInfoTemp variable, and then pTypeTemp so the next loop can use where it left off.
private static PropertyInfo GetPropertyInfo(PropertyInfo[] pInfoArray, string key)
{
PropertyInfo pInfo = null;
string[] keyParts = key.Split('.');
Regex arrayRgx = new Regex("\\[\\d*\\]");
PropertyInfo pInfoTemp = null;
Type pTypeTemp = null;
foreach (PropertyInfo prop in pInfoArray)
{
string keyPartsTrimmed = arrayRgx.Replace(keyParts[0], ""); // removes '[#]' from string
if (keyPartsTrimmed == prop.Name) // match property name
{
for (int i = 0; i < keyParts.Count(); i++)
{
if (i == 0) // initial item [0]
{
pTypeTemp = prop.PropertyType; // gets [0]'s type
pInfoTemp = prop; // assigns [0]'s property info
}
else
{
pInfoTemp = GetNestedPropertyInfo(pTypeTemp, arrayRgx.Replace(keyParts[i], "")); // gets [i]'s property info for return or next iteration
pTypeTemp = pInfoTemp.PropertyType; // gets [i]'s type for next iteration
}
}
pInfo = pInfoTemp;
break;
}
}
return pInfo;
}
This next method is invoked by the previous for grabbing nested property info, more importantly for detecting whether the passedItemType is a List (without this, it fails to work correctly as it is unable to find the property asked for in a List<> Type. I need to know what the List item Type is.
private static PropertyInfo GetNestedPropertyInfo(Type passedItemType, string passedProperty)
{
PropertyInfo pInfoOut = null;
if (passedItemType.IsGenericType && passedItemType.GetGenericTypeDefinition() == typeof(List<>))
{
Type itemType = passedItemType.GetGenericArguments()[0];
pInfoOut = itemType.GetProperty(passedProperty);
}
else
{
pInfoOut = passedItemType.GetProperty(passedProperty);
}
return pInfoOut;
}
This currently suits my requirements as they are today, and I have tested it with the following properties, lists, subclasses, subclasses with lists, etc.. to 4 levels deep, but should function properly no matter the depth:
firstName
lastName
Items[1].sprocket
subClass.subClassInt
subClass.mySubClassObj.sprocketObj
subClass.ItemsInMySubClass[1].sprocket
subClass.ItemsInMySubClass[0].mySubClassObj.widgetObj
subClass.ItemsInMySubClass[2].mySubClassObj.sprocketObj
If anyone has a better solution, or see any potential issues with what I have, I welcome the feedback.
The best way in your case is to make a parser that split that expression.