Class: NextPage::Sort::NameEvaluator

Inherits:
Object
  • Object
show all
Defined in:
lib/next_page/sort/name_evaluator.rb

Overview

Name Evaluator

Determines if a name represents an attribute or a scope, provides mapping if the scope requires a prefix or suffix. Scope is checked first, allowing it to override an attribute of the same name. For scopes, method directional_scope? checks to see if the scope is a class method that accepts one parameter; if so, then the scope will be invoked with the direction.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(model, name) ⇒ NameEvaluator

Returns a new instance of NameEvaluator.



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# File 'lib/next_page/sort/name_evaluator.rb', line 14

def initialize(model, name)
  @model = model
  @name = name.to_s
  evaluate_for_scope
end

Instance Attribute Details

#scope_name ⇒ Object (readonly)

Returns the value of attribute scope_name.



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# File 'lib/next_page/sort/name_evaluator.rb', line 12

def scope_name
  @scope_name
end

Instance Method Details

#directional_scope? ⇒ Boolean

true when scope is class method with one parameter

Returns:

  • (Boolean) 


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# File 'lib/next_page/sort/name_evaluator.rb', line 25

def directional_scope?
  return false unless scope?

  @model.method(@scope_name).arity == 1
end

#scope? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/next_page/sort/name_evaluator.rb', line 20

def scope?
  @scope_name.present?
end

#valid_attribute_name? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/next_page/sort/name_evaluator.rb', line 31

def valid_attribute_name?
  @model.attribute_names.include?(@name)
end