Class: BabySqueel::DSL

Inherits:
Table
  • Object
show all
Defined in:
lib/baby_squeel/dsl.rb

Instance Attribute Summary

Attributes inherited from Table

#_join, #_on, #_table

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Table

#[], #_arel, #alias, #alias!, #association, #initialize, #inner, #inner!, #on, #on!, #outer, #outer!

Constructor Details

This class inherits a constructor from BabySqueel::Table

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(meth, *args, &block) ⇒ Object (private) 



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# File 'lib/baby_squeel/dsl.rb', line 39

def method_missing(meth, *args, &block)
  if !args.empty? && !block_given?
    func(meth, args)
  else
    super
  end
end

Class Method Details

.evaluate(scope, &block) ⇒ Object

Evaluates a block in the context of a new DSL instance.



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# File 'lib/baby_squeel/dsl.rb', line 8

def self.evaluate(scope, &block)
  new(scope).evaluate(&block)
end

Instance Method Details

#evaluate(&block) ⇒ Object

Evaluates a DSL block. If arity is given, this method ‘yield` itself, rather than `instance_eval`.



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# File 'lib/baby_squeel/dsl.rb', line 29

def evaluate(&block)
  if block.arity.zero?
    Nodes.unwrap instance_eval(&block)
  else
    Nodes.unwrap yield(self)
  end
end

#func(name, *args) ⇒ Object

Create a SQL function. See Arel::Nodes::NamedFunction.

Arguments

  • name - The name of a SQL function (ex. coalesce).

  • args - The arguments to be passed to the SQL function.

Example

Post.select { func('coalesce', id, 1) }
#=> SELECT COALESCE("posts"."id", 1) FROM "posts"



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# File 'lib/baby_squeel/dsl.rb', line 23

def func(name, *args)
  Nodes.wrap Arel::Nodes::NamedFunction.new(name.to_s, args)
end