Pharo中如何获取指定类的所有Setter方法？

Hey there! I remember struggling with this exact question when I was new to Pharo—don't worry, there are a couple of simple, reliable ways to get those setter methods. Let's break them down using your ClassA example:

1. Use the Method Protocol (Most Direct for Your Case) #

Since you mentioned your setter methods are already grouped under the setters protocol, this is the easiest approach. Pharo lets you fetch all methods in a specific protocol directly with this code:

ClassA methodsInProtocol: #setters

Running this will return a collection containing exactly your name: and age: methods. This works perfectly because you've already organized your setters into a dedicated protocol—no extra filtering needed!

2. Filter by Setter Naming Pattern (For Unorganized Protocols) #

If you ever need to find setters without relying on a protocol, you can use Pharo's method selector rules. Setters in Pharo almost always end with a colon (:) and are instance methods. Here's a quick way to grab them:

ClassA instanceMethods select: [:method | method selector endsWith: ':']

This will get all instance methods with a colon at the end. Note: This might include non-setter methods (like do: or with:) if your class has them, so it's less precise than using the protocol.

Extra Precise: Check if the Method Assigns to an Instance Variable #

For absolute accuracy (to only get methods that actually set an instance variable), you can inspect the method's parse tree:

ClassA instanceMethods select: [:method |
  method parseTree isAssignment and: [
    method parseTree variable isInstanceVariable and: [
      method selector = (method parseTree variable name , ':') asSymbol
    ]
  ]
]

This checks three key things:

• The method contains an assignment operation
• The assignment targets an instance variable of the class
• The method's selector matches the variable name plus a colon (e.g., name: for the name variable)

This will only return true setter methods, even if you have other colon-ending methods in your class.

For your ClassA example, either the protocol method or the precise parse tree check will give you exactly the name: and age: methods you need.

内容的提问来源于stack exchange，提问作者Mansour Faouziel