The Ruby method that is invoked on an object when you send it a message (or call a method) that it doesn't understand.
The method_missing method is used to respond to methods when you don't know what methods you need to understand until runtime.
Questions tagged [method-missing]
124 questions
3
votes
4 answers
Allow unqualified access to Ruby constants in a different module
According to this answer, one can get a constant into the global namespace with an include at the top level, at least in IRB. Naively, I thought I could do the same trick inside a module:
module Foo
class Bar
def frob(val)
"frobbed…
David Moles
- 48,006
- 27
- 136
- 235
3
votes
1 answer
AxHost.GetPictureFromIPicture() method missing, retrieving picture (attachment) from MS Access database
I'm trying to use AxHost.GetPictureFromIPicture() to get a GIF image (saved as an attachment type) from MS Access 2013 database file (*.accdb) - convert it to Image so I can display it in a PictureBox. But the method is not there! :( Am I missing…
Forrest G
- 31
- 1
3
votes
1 answer
Ruby. How to know which class instance method is defined?
I want to know which class method_missing is defined.
It is defined in Object.
How can I figure out which class along the hierarchy overrides it?
Zhang Kai Yu
- 362
- 2
- 8
3
votes
2 answers
Define class methods dynamically in Rails
I define class methods dynamically in Rails as follows:
class << self
%w[school1 school2].each do |school|
define_method("self.find_by_#{school}_id") do |id|
MyClass.find_by(school: school, id: id)
end
end
end
How can I use…
AdamNYC
- 19,887
- 29
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3
votes
1 answer
Defining method_missing on Active record in rails 4 throws SystemStackError: stack level too deep on attributes
I recently upgraded my app to rails 4.0 and ruby 2.0
I'm having problems understanding why my method_missing definitions won't work. I'm pretty sure I'm not doing anything differently than I was before.
Specifically, I'm trying to create a method…
rainbowFish
- 265
- 3
- 13
2
votes
1 answer
When might a dispatch table be as good as method_missing in Ruby?
Are there any situations where a dispatch table, implemented as a hash of lambdas, might be as good, if not better, than over-riding Ruby's method_missing? I'm asking because I used this technique today as I'm a comparative newbie with Ruby, but…
Dexygen
- 12,287
- 13
- 80
- 147
2
votes
1 answer
Stack level too deep when using `method_missing`
I have a dummy object that always yield itself:
x = Object.new; x.define_singleton_method(:method_missing) { |*| x }
x.foo.bar.baz == x # => true
I wanted to simplify it, but suddenly it doesn't work anymore:
x = Object.new; def…
Ulysse BN
- 10,116
- 7
- 54
- 82
2
votes
7 answers
method_missing in "Programming Ruby" over my head
method_missing
*obj.method_missing( symbol h , args i ) → other_obj
Invoked by Ruby when obj is sent a
message it cannot handle. symbol is
the symbol for the method called, and
args are any arguments that were
passed to it. The example…
j. parks
- 23
- 1
- 5
2
votes
1 answer
groovy "MissingMethodException" RESTAPI call
I am trying to access data from RESTAPI using groovy code where i am getting error as below:
groovy.lang.MissingMethodException: No signature of method: java.lang.String.call() is applicable for argument types: () values: []
Possible solutions:…
Symonds
- 184
- 1
- 2
- 15
2
votes
3 answers
Rails: method_missing is not called on model when using associations
My current code:
class Product < ActiveRecord::Base
belongs_to :category
end
class Category < ActiveRecord::Base
def method_missing name
true
end
end
Category.new.ex_undefined_method #=>…
Tom Maeckelberghe
- 1,969
- 3
- 21
- 24
2
votes
0 answers
Crystal lang : method_missing for class object?
Something like this?
class A
module ClassMethods
macro method_missing(call)
{% p call %}
end
end
extend ClassMethods
end
A.a
Result of the code is Error : undefined method 'a' for A:Class. It seems…
XQY
- 552
- 4
- 17
2
votes
1 answer
custom method_missing ignored if instance is defined via an ActiveRecord association
I have submissions that might be in various states and wrote a method_missing override that allows me to check their state with calls like
submission.draft?
submission.published?
This works wonderfully.
I also, for various reasons that might not…
chadoh
- 4,343
- 6
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- 64
2
votes
2 answers
Rails: "Stack level too deep" error when calling "id" primary key method
This is a repost on another issue, better isolated this time.
In my environment.rb file I changed this line:
config.time_zone = 'UTC'
to this line:
config.active_record.default_timezone = :utc
Ever since, this…
AmitA
- 3,239
- 1
- 22
- 31
2
votes
1 answer
Why are some undefined methods (e.g. Foo) not captured by `method_missing`?
I tried to capture undefined methods by the following definition:
def method_missing m
puts "#{m} is missing"
end
When I write an undefined method such as foo after it, it is captured by method_missing:
foo # => foo is missing
but when I write…
sawa
- 165,429
- 45
- 277
- 381
2
votes
1 answer
Ruby metaprogramming with method_missing to make a HTML DSL
I'm learning metaprogramming and am trying to make a little DSL to generate HTML. The @result instance variable is not generating the correct answer because when the h1 method is called, the @result instance variable is reset. Is there an elegant…
Powers
- 18,150
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