expando

App Engine Entity to Dictionary

由 柔情痞子 提交于 2020-01-23 06:53:33
问题 What is a good way to copy a google app engine entity (in python) to a dictionary object? I'm using db.Expando objects. All properties are expando properties. Thanks! 回答1: Having an entity called foo try with: foo.__dict__ 回答2: try this. Where "m" is the instance of the Expando you wish to turn into a dictionary. dict([(x,getattr(m,x)) for x in m.dynamic_properties()]) 回答3: This should work from google.appengine.ext import db db.to_dict(entity) 回答4: The new version of the Google Cloud Python

App engine - check to see if a property exists within Expando class

由 耗尽温柔 提交于 2020-01-03 18:50:18
问题 What is a good way to check to see if a property is populated in an expando class (Python for App Engine) Can I do: if Expando_class_name.property_name_to_check: do = someStuff Or is that going to give me an error? Thanks! 回答1: Use hasattr : if hasattr(expando_instance, 'foo'): # Do something with expando_instance.foo 回答2: A better way is to use the dynamic_properties method. if 'foo' in entity.dynamic_properties(): pass 来源： https://stackoverflow.com/questions/6339032/app-engine-check-to-see

Why .data() function of jQuery is better to prevent memory leaks?

由 我是研究僧i 提交于 2019-12-21 12:04:18
问题 Regarding to jQuery utility function jQuery.data() the online documentation says: "The jQuery.data() method allows us to attach data of any type to DOM elements in a way that is safe from circular references and therefore from memory leaks. " Why to use: document.body.foo = 52; can result a memory leak -or in what conditions- so that I should use jQuery.data(document.body, 'foo', 52); Should I ALWAYS prefer .data() instead of using expandos in any case? (I would appreciate if you can provide

Best way to add metadata to HTML elements

由 ☆樱花仙子☆ 提交于 2019-12-20 18:29:43
问题 I'm trying to put together a way of marking up various components in HTML that get parsed by a jQuery script and created when the page loads. For example, at the moment I can put the following in to my page.. <a href="link.html" class="Theme-Button Theme-Button-Style-win2007 Theme-Button-iconLeft Theme-Button-AlignmentCenter Theme-Button-fullWidth">This is a button</a> When the jQuery script finds it it'll inject the html necessary to create a button with an icon on it and all the necessary

Grails: println only works sometimes or something

由 我与影子孤独终老i 提交于 2019-12-12 06:03:17
问题 I make a brand new grails project and put this in the bootstrap: ExpandoMetaClass.enableGlobally() Integer.metaClass.precision = {->return 1} println 3.precision() println "rofl" println 15.precision() And it does what I expect, run-app prints: 1 rofl 1 But if i take out the println "rofl" it won't print that second one. It just prints one 1 without the rofl... WTF? Again, becasue this doesn't make any sense to me, this code: ExpandoMetaClass.enableGlobally() Integer.metaClass.precision = {-

Adding custom field to User programmatically through liferay.expando

由 假如想象 提交于 2019-12-12 03:43:11
问题 I am trying to add fields to com.liferay.portal.model.User , an extra attribute using Expando . Can someone explain to me how this method is adding a field because docs don't have much description. private void addUserCustomAttribute(long companyId, ExpandoTable userExpandoTable, String attributeName, int type) throws PortalException, SystemException { ExpandoColumnLocalServiceUtil.getColumn(userExpandoTable.getTableId(), attributeName); //should be addColumn(long tableId, String name, int

Why Doesn't JQuery Expose its UUID Functionality?

由 倖福魔咒の 提交于 2019-12-09 18:06:08
问题 Underneath the hood JQuery uses a map of "UUIDs" (just a counter it maintains as jQuery.uuid ) to work around the well-known memory leak issues browsers have when you attach a property to a tag in the DOM from Javascript. In lieu of doing so, JQuery uses the $.data(tag, name, value) to store data in a map keyed off of the uuid (a key that can be determined by checking tag[jQuery.expando] ). While $.data() is very useful, there are times you want to map data to tags without dumping that data

Reflect on an ExpandoObject

由 三世轮回 提交于 2019-12-07 03:57:29
问题 I have written a nifty function that will accept a system.object , reflect on its properties and serialize the object into a JSON string. It looks like this: public class JSONSerializer { public string Serialize(object obj) Now, I want to be able to do this to serialize a dynamic/ExpandoObject, but because my serializer uses reflection, it isn't able to do it. What's the workaround? public class Test { public dynamic MakeDynamicCat() { dynamic newCat = new ExpandoObject(); newCat.Name =

How to create dynamic fields in Google App Engine expando class?

由 有些话、适合烂在心里 提交于 2019-12-06 05:14:49
问题 I have a db expando class called widget. I'm passing in a json string and converting it to a dict and then adding it to the datastore. My question is how can I loop through my dict to create dynamic fields. widget = Widget.get_by_key_name(key_name) widget.name = self.request.get('wname') fields = simplejson.loads(self.request.get('wcontents')) for k,v in fields.iteritems(): widget.k = v This renders "k" as my field name as oppose to the k value in the dict. 回答1: The syntax widget.k references

Reflect on an ExpandoObject

由 ￣綄美尐妖づ 提交于 2019-12-05 06:48:34
I have written a nifty function that will accept a system.object , reflect on its properties and serialize the object into a JSON string. It looks like this: public class JSONSerializer { public string Serialize(object obj) Now, I want to be able to do this to serialize a dynamic/ExpandoObject, but because my serializer uses reflection, it isn't able to do it. What's the workaround? public class Test { public dynamic MakeDynamicCat() { dynamic newCat = new ExpandoObject(); newCat.Name = "Polly"; newCat.Pedigree = new ExpandoObject(); newCat.Pedigree.Breed = "Whatever"; return newCat; } public
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