I'm trying to add property options to my model. I have a StringProperty and I added required=True but I'm still able to create an object with the required field being empty.
I tried it in the admin and also in my update form for the specific model so not sure what I'm doing wrong?
You can create it, but can you put it?
class x(ndb.Model):
author = ndb.StringProperty(required=True)
a = x()
a.put()
Fails with: BadValueError: Entity has uninitialized properties: **author**
Setting a value on the required property author allows you to save it:
a.author = "some_value"
The put can now succeed.
key = a.put()
and key is now:
Key('x', 5707702298738688)
or even key.urlsafe()
ahNzfnNoYXJlZC1wbGF5Z3JvdW5kcg4LEgF4GICAgICArpkKDKIBEDYwNTM4Njc2MzY2NTQwODA
Read more about storing data here.
Related
Gurus,
Here is my scenario:
I am defining a new client-side property (i.e. fullName) on one my entities using breeze's registerEntityTypeCtor function. The fullName property is coded to check the values of the firstName and lastName properties on the entity to determine it's value. It works when I am doing a query and receiving entities back from the db.
However, when I create a new entity on the client side (calling breeze's createEntity function) or make changes to the firstName or LastName properties without doing a save, then the custom fullName property is never updated until I perform another db pull. With breeze change tracking shouldn't the fullName property update any time either of the name properties changes?
During debug, I noticed that when I use a getter in code: (i.e. var fullName = entity.fullName) -- as I step through the code the ctor is hits the "backingStore" value of my entity which is either default value (using the createEntity) or the last db value, but never the current value of the entity.
What am I missing? Thanks
Here is an example I used for setting up the property:
function registerSpmoleSurvey(metadataStore) {
metadataStore.registerEntityTypeCtor('SpmoleSurvey', spmoleSurvey);
function spmoleSurvey() { }
Object.defineProperty(spmoleSurvey.prototype, 'fullName', {
get: function () {
var ln = this.lastName;
var fn = this.firstName;
return ln ? fn + ' ' + ln : fn;
}
});
}
Look at this page for examples of adding computeds to your Breeze entities -
http://www.breezejs.com/documentation/extending-entities
Pass in an anonymous function as the third parameter that extends the entity.
HI figure out what I was doing wrong...seems that I was a victim of camelCasing and I capitalize the property name inappropriately. Wrong as advertise now :}
In my application I have a model like so:
class MyModel(ndb.Model):
entity_key_list = ndb.KeyProperty('k', repeated=True, indexed=False)
entity_key_num = ndb.ComputedProperty('n', lambda self: len(self.entity_key_list))
verified = ndb.BooleanProperty('v')
Is it possible to have the entity_key_num property when verified is false?
You can return None if not verified like this:
entity_key_num = ndb.ComputedProperty('n', lambda self: len(self.entity_key_list) if not self.verified else None)
If you don't want to have the value None at all and dynamically delete or create this property then you will have to use the ndb.Expando class where you can do all these fancy stuff. Note that you won't be able to delete the ComputedProperty so you will have to keep track of that value on your own.
in my visualforce page i have some campaign object first user select an object then there is a multi picklist. in this picklist there is Label for all the fields user selects some fields then i have to show the value of these fields in the selected campaign object
for showing multiple picklist my apex function is
public List<SelectOption> getOptionalFields(){
Map <String, Schema.SObjectField> fieldMap= Campaign.sObjectType.getDescribe().fields.getMap();
List<SelectOption> fieldsName =new List<SelectOption>();
for(Schema.SObjectField sfield : fieldMap.Values())
{
schema.describefieldresult dfield = sfield.getDescribe();
fieldsName.add(new SelectOption(dfield.getName(),dfield.getLabel()));
}
but i have no idea how to show value for the the field
for exmple i have object instance like
Campaign c;
now i have to get value of any field whose Name is in string form.how to get corresponding value for that field.one solution is just write like
say
String fieldName;
and use multiple if
if(fieldName=='Name')
c.Name=
if(fieldName=='Id')
c.Id=
is there any other convenient method??please explain!!
You need to read about "dynamic apex". Every "concrete" sObject (like Account, Contact, custom objects) can be cast down to generic sObject (or you can use the methods directly).
Object o = c.get(fieldName);
String returnValue = String.valueOf(o);
There are some useful examples on dynamic get and set methods on Salesforce-dedicated site: https://salesforce.stackexchange.com/questions/8325/retrieving-value-using-dynamic-soql https://salesforce.stackexchange.com/questions/4193/update-a-records-using-generic-fields (second question is a bit more advanced)
You'll still need to somehow decide when to return it as String, when as number, when as date... Just experiment with it and either do some simple mapping or use describe methods to learn the actual field type...
I've following model set up initially
class Obj (db.Model):
name = db.StringProperty(required=True)
rating = db.IntegerProperty(default=0, required=False)
There are entities already created with above, such as:
name="test1", rating="3"
So, I need to change the rating type to float. I was trying to achieve this with db.Expando
class Obj (db.Expando):
name = db.StringProperty(required=True)
rating = db.FloatProperty(default=0, required=False)
Before I'm able to retrieve the instance of the Obj model to update it to float value, I've already got the following error:
Property rating must be a float
At first, I got this error, because I wasn't using db.Expando. However, after using db.Expando, I assumed this error shouldn't come into place ? Since it can dynamically change value, type etc as I read the articles.
Being new to db.Expando, I need help. Does anyone have clue to what happened ?
EDIT
for o in Obj.all():
a = []
if o.rating:
o.rating = float(str(restaurant.rating))
else:
o.rating = float(0)
a.append(restaurant)
db.put(a)
After having above code, the same error pops up
Property rating must be a float
SOLUTION
Temporarily removed the rating from model definition and updated the values to float first and then add the new rating definition with db.FloatProperty
A db.Expando model allows you to add properties that aren't defined in the class itself; however, any properties that are explicitly defined in the class do need to be the correct type.
Simply removing rating from the model definition may work for you.
I have an entity in my app engine datastore. There's actually only one instance of this entity. I can see it in my admin console. Is it possible to add a new attribute to the entity via the admin console (using gql perhaps)?
Right now it looks something like:
Entity: Foo
Attributes: mName, mAge, mScore
and I'd like to add a new boolean attribute to this entity like "mGraduated" or something like that.
In the worst case I can write some code to delete the entity then save a new one, but yeah was just wondering.
Thanks
-------- Update ---------
Tried adding the new attribute to my class (using java) and upon loading from the datastore I get the following:
java.lang.NullPointerException:
Datastore entity with kind Foo and key Foo(\"Foo\") has a null property named mGraduated.
This property is mapped to com.me.types.Foo.mGraduated, which cannot accept null values.
This is what my entity class looks like, I just added the new attribute (mGraduated), then deployed, then tried loading the single entity from the datastore (which produced the above exception):
#PersistenceCapable
public class Foo
{
#PrimaryKey
private String k;
/** Some old attributes, look like the following. */
#Persistent
#Extension(vendorName = "datanucleus", key = "gae.unindexed", value="true")
private String mName;
...
/** Tried adding the new one. */
#Persistent
#Extension(vendorName = "datanucleus", key = "gae.unindexed", value="true")
private boolean mGraduated;
The only way to implement this is to use Boolean as the type for the new property..
Than in set method you can accept boolean value, that's no issue.
If you want the get method to also return boolean.. you also can, but be sure to check if the value is null and if so.. return default value (e.g. true)
so
private Boolean newProp = null; // can also assing default value .. e.g. true;
public void setNewProp(boolean val)
{
this.newProp = val;
}
public boolean getNewProp()
{
if(this.newProp == null)
return true; // Default value if not set
return this.newProp.booleanValue();
}
I recommend you not to migrate your data in this case - it can be very costly and can deplete your quota easily (read old data, create new, delete old = 3 operations for every entry in you data store)
You can't do this through the admin console, but you shouldn't have to delete the entity. Instead just update it- the Datastore does not enforce schemas for Kinds.
E.g., if Foo is a subclass of db.Model (Python), change your model subclass to include the new property; fetch the model instance (e.g., by its key), update the instance, including setting the value of the new field; and save the modified instance. Since you just have one instance this is easy. With many such instances to update you'd probably want to do this via task queue tasks or via a mapreduce job.
You have declared the new mGraduated field using the primitive type boolean, which cannot be null. The existing entity can't be loaded into the model class because it doesn't have this property. One option is to declare this property using the Boolean class, which can accept a null value.
The Admin Console only knows about properties in existing entities. You cannot use the Admin Console directly to create a new property with a name not used by any existing entities. (This is just a limitation of the Console. App code can do this easily.)