accessor

问题 I have a model A that "has many" B. class A < ActiveRecord::Base has_many :B attr_accessible :title end class B < ActiveRecord::Base belongs_to :A attr_accessible :name end I want to add a field to my "edit A" form : a textarea in which I will enter my B's :name for each line, and on submit, parse the field, and process each line. The question is, how should I do that ? Edit Following Rails - Add attributes not in model and update model attribute I have come to this : class A < ActiveRecord:

问题 I now know that the proper way to access Moose class attributes is to ALWAYS go through the accessor method that is automatically generated by Moose . See Friedo's answer to my previous question for the reasons why. However this raises a new question... How do you ensure Moose class attributes are handled correctly within regular expressions? Take the following for example: Person.pm package Person; use strict; use warnings; use Moose; has 'name' => (is => 'rw', isa => 'Str'); has 'age' =>

问题 I have three tables in MySQL database. category (excluded from this question) sub_category product The relationship between these tables is intuitive - one-to-many in the order in which they appear. I'm iterating through a list of SubCategory , List<SubCategory> using <p:dataGrid> as follows. <p:dataGrid var="row" value="#{featuredProductManagedBean}" rows="4" first="0" columns="1" rowIndexVar="rowIndex" paginator="true" paginatorAlwaysVisible="false" pageLinks="10" lazy="true"

问题 Each business object has a matching object that contains sql calls. I'd like to restrict these sql objects in a way where they can only be used by the matching business object. How can this be achieved? Update Greg brought up the point about testability. Since the SqlObjects will contain very business-process specific sql I don't want them reused in multiple buiness objects. (Basic CRUD operations are all code-generated) Is there a way to make the SqlObjects accessible to only one business

问题 For efficiency I want to access the member variable associated with a property in a subclass. If I have a property declared like: @interface Mumbo : NSObject @property (nonatomic) GLKVector3 position; @end In the implementation of Mumbo I can refer to position either as self.position or directly as _position (the default synthesized member variable - I am not using @synthesize). I use the latter for efficiency in some cases to avoid copying structures. However, in subclasses I cannot refer to

问题 Is there a way to define a property in a TypeScript module ? None of these compile: module My { // doesnt work get Value(): number { return 42; } // doesn't work either get function Value(): number { return 42; } // nope function get Value(): number { return 42; } } Right now I'm forced to use this: module My { declare var Value: number; Object.defineProperty(My, "Value", { get: () => 42 }); } The second form seems messy to me and the code hinting doesn't really treat it as a read-only

问题 I'm reading through .Net Docs and i came across this term "fidelity", Type safety is also used to help enforce encapsulation by guaranteeing the fidelity of the accessor keywords. What does it mean (in relation to accessor keywords)? 回答1: Sigh. There is simply too much documentation and not enough time for the development team to review it for accuracy in jargon. This overview is a mess of small errors and confusing, non-standard jargon usages. The paragraph in question is: Type safety is

问题 System.BadImageFormatException: Could not load file or assembly 'x_Accessor, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded. I am having a hard time finding a cure for this ailment... I have created unit tests for dot net test projects. With the default unit test framework. The automated tool created an accessor - which would be used for testing private methods

问题 In SpiderMonkey, how do I get the value of a property of a JSObject from within my C code? static JSBool JSD_getter(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval) { jsval js_id; JS_GetProperty(cx, obj, "id", &js_id); // js_id has JavaScript type int c_id; JS_ValueToInt32(cx, js_id, &c_id); // Now, c_id contains the actual value } // of obj.id, as a C native type 回答1: JS_GetProperty() 来源： https://stackoverflow.com/questions/107317/how-do-i-get-the-value-of-a-jsobject

问题 Getter methods can be used without an explicit receiver unless there is a local variable with the same name: class A; attr_reader :foo end A.new.instance_eval do @foo = :foo p foo end # => :foo This will not hold when there is a local variable with the same name, due to the principle that interpretation as a local variable has priority than as a method call whenever there is an ambiguity. class A; attr_reader :foo end A.new.instance_eval do foo = :bar @foo = :foo p foo end # => :bar However,