raise ArgumentError when the wrong name is passed to lr_has_nested_at…

…tributes_for

example/person.rb

@@ -3,9 +3,10 @@
 # Example class
 class Person < LazyRecord::Base
   attr_accessor :name, :age, :haircut
-  lr_has_many :dogs, :cats
+  lr_has_many :dogs
+  lr_has_many :kitties, class_name: 'Cat'
   lr_has_one :friend
-  lr_accepts_nested_attributes_for :dogs, :cats
+  lr_accepts_nested_attributes_for :dogs, :kitties
 
   lr_scope :new_with_dog, lambda { |opts = {}|
     dog = opts.fetch(:dog) { {} }

lib/lazy_record/collections.rb

@@ -92,9 +92,18 @@ def lr_accepts_nested_attributes_for(*collections)
       mod.module_eval do
         collections.each do |collection|
           options = _collections[collection]
+          _no_collection_error(collection) unless options
           define_collection_attributes_setter(collection, options)
         end
       end
     end
+
+    def _no_collection_error(collection)
+      klass = collection.to_s.classify
+      klass = _collections.find { |_col, opt| opt[:class_name] == klass }.first
+      suggestion = klass ? ". Did you mean #{klass}?" : ''
+      msg = "#{self} doesn't have a collection of #{collection}#{suggestion}"
+      raise ArgumentError, msg, caller
+    end
   end
 end

spec/lazy_record/collections_spec.rb

@@ -88,5 +88,11 @@
       expect(parent.children.map(&:age)).to eq [11, 12]
       expect(parent.brothers.map(&:name)).to eq %w[Sue Bob]
     end
+
+    it 'does not allow accepting nested attributes unless it has the collection' do
+      block = -> { Parent.class_eval { lr_accepts_nested_attributes_for :siblings } }
+
+      expect(&block).to raise_error(ArgumentError, "Parent::Collections doesn't have a collection of siblings. Did you mean brothers?")
+    end
   end
 end