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Class: ActiveRecord::DynamicMatchers::Method

Relationships & Source Files
Extension / Inclusion / Inheritance Descendants
Subclasses:
FindBy, FindByBang
Inherits: Object
Defined in: activerecord/lib/active_record/dynamic_matchers.rb

Class Method Summary

Class Method Details

.attribute_names(model, name) (private)

[ GitHub ] 

  


# File 'activerecord/lib/active_record/dynamic_matchers.rb', line 51



def attribute_names(model, name)
  attribute_names = name.match(pattern)[1].split("_and_")
  attribute_names.map! { |name| model.attribute_aliases[name] || name }
end


  








  

    .attributes_hash(model, method_name)   (private)
  



  

    

Given that the parameters starts with _, the finder needs to use the same parameter name.


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/dynamic_matchers.rb', line 68



def attributes_hash(model, method_name)
  "{" + attribute_names(model, method_name).map { |name| ":#{name} => _#{name}" }.join(",") + "}"
end


  








  

    .body(model, method_name)   (private)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/dynamic_matchers.rb', line 56



def body(model, method_name)
  "#{finder}(#{attributes_hash(model, method_name)})"
end


  








  

    .define(model, name)  
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/dynamic_matchers.rb', line 38



def define(model, name)
  model.class_eval <<-CODE, __FILE__, __LINE__ + 1
  def self.#{name}(#{signature(model, name)})
    #{body(model, name)}
  end
  CODE
end


  








  

    .make_pattern(prefix, suffix)   (private)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/dynamic_matchers.rb', line 47



def make_pattern(prefix, suffix)
  /\A#{prefix}_([_a-zA-Z]\w*)#{suffix}\Z/
end


  








  

    .match(name)  
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/dynamic_matchers.rb', line 30



def match(name)
  FindBy.match?(name) || FindByBang.match?(name)
end


  








  

    .signature(model, method_name)   (private)
  



  

    

The parameters in the signature may have reserved Ruby words, in order to prevent errors, we start each param name with _.


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/dynamic_matchers.rb', line 62



def signature(model, method_name)
  attribute_names(model, method_name.to_s).map { |name| "_#{name}" }.join(", ")
end


  








  

    .valid?(model, name)  ⇒ Boolean 
  



  

    
  





  


  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/dynamic_matchers.rb', line 34



def valid?(model, name)
  attribute_names(model, name.to_s).all? { |name| model.columns_hash[name] || model.reflect_on_aggregation(name.to_sym) }
end