Class: Armada::Relation

Inherits:
Object
  • Object
show all
Defined in:
lib/armada/relation.rb

Constant Summary collapse

FIND_OPTIONS_KEYS = 
%w(where offset order limit only distinct)

Instance Method Summary collapse

Constructor Details

#initialize(superclass) ⇒ Relation

Returns a new instance of Relation.



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# File 'lib/armada/relation.rb', line 29

def initialize(superclass)
  @superclass = superclass
  @join = "and"
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

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



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# File 'lib/armada/relation.rb', line 147

def method_missing(method, *args, &block)
  method = method.to_s
  if %w(create_index drop_index).include?(method)
    singleton_class.send(:define_method, method) do
      raise(ArgumentError, "Missing 'order' condition") unless option_defined?(:order)
      query(to_query(method, @order)) == 1
    end.call
  elsif %w(delete count update insert select checked_write multi_read multi_write list_indexes).include?(method)
    singleton_class.send(:define_method, method) do |*args, &block|
      query(to_query(method, *args, &block))
    end.call(*args, &block)
  else
    super
  end
end

Instance Method Details

#all ⇒ Object 



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# File 'lib/armada/relation.rb', line 130

def all
  results = self.select
  return results if option_defined?(:only) || @superclass.is_a?(String)
  results.map { |record| @superclass.send(:instantiate, record) }
end

#distinct ⇒ Object 



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# File 'lib/armada/relation.rb', line 122

def distinct
  self.dup.tap { |r| r.set_option(:distinct, true) }
end

#get_option(option) ⇒ Object 



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# File 'lib/armada/relation.rb', line 141

def get_option(option)
  instance_variable_get("@#{option}")
end

#limit(value) ⇒ Object 



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# File 'lib/armada/relation.rb', line 83

def limit(value)
  self.dup.tap { |r| r.set_option(:limit, value) }
end

#offset(value) ⇒ Object 



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# File 'lib/armada/relation.rb', line 79

def offset(value)
  self.dup.tap { |r| r.set_option(:offset, value) }
end

#only(*attributes) ⇒ Object 



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# File 'lib/armada/relation.rb', line 111

def only(*attributes)
  attributes.flatten!
  only = if option_defined?(:only)
    Array.wrap(@only).concat(attributes)
  else
    attributes.size == 1 ? attributes.first : attributes
  end
  
  self.dup.tap { |r| r.set_option(:only, only) }
end

#or ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/armada/relation.rb', line 74

def or
  raise(ArgumentError, "Missing 'where' condition") unless option_defined?(:where)
  self.dup.tap { |r| r.set_option(:join, "or") }
end

#order(*attributes) ⇒ Object 



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# File 'lib/armada/relation.rb', line 87

def order(*attributes)
  options = attributes.extract_options!
  
  attributes.flatten!
  attributes.map! do |attribute|
    attribute.is_a?(Array) ? attribute : [attribute, :asc]
  end
  
  order = attributes.concat(options.to_a).tap do |order|
    order.flatten! if order.size == 1
  end
  
  old_order = @order
  
  new_order = if option_defined?(:order)
    old_order = [old_order] unless old_order.first.is_a?(Array)
    order.first.is_a?(Array) ? old_order.concat(order) : old_order << order
  else
    order
  end
  
  self.dup.tap { |r| r.set_option(:order, new_order) }
end

#set_option(option, value) ⇒ Object 



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# File 'lib/armada/relation.rb', line 137

def set_option(option, value)
  instance_variable_set("@#{option}", value)
end

#to_query(method = nil, *args, &block) ⇒ Object 



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# File 'lib/armada/relation.rb', line 126

def to_query(method = nil, *args, &block)
  method ? send("generate_#{method}_query", *args, &block) : find_options
end

#where(conditions) ⇒ Object 



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# File 'lib/armada/relation.rb', line 34

def where(conditions)
  where = []
  conditions.each_pair do |attribute, value|
    if value.is_a?(Hash)
       value.each_pair do |operator, val|
         where << [operator, attribute, build_condition_value(val)]
       end
    else
      where << build_condition(attribute, value)  
    end
  end
  where = where.size > 1 ? where.unshift("and") : where.first
  
  join, old_where = [@join, @where]
  
  new_where = if option_defined?(:where)
    if join == old_where.first && old_where.first == where.first
      old_where.concat(where.from(1))
    elsif join == old_where.first && !is_conjunction?(where.first)
      old_where << where
    elsif join == where.first && is_conjunction?(old_where.first)
      old_where.tap { |w| w[-1] = ([join] << w.last).concat(where.from(1)) }
    elsif join == where.first && !is_conjunction?(old_where.first)
      where.insert(1,old_where)
    elsif join == "and" && old_where.first == "or" && !is_conjunction?(where.first) && !is_conjunction?(old_where.last.first)
      old_where.tap { |w| w[-1] = [join] << w.last << where }
    elsif join == "and" && old_where.first == "or" && !is_conjunction?(where.first) && is_conjunction?(old_where.last.first)
      old_where.tap { |w| w[-1] << where }
    else
      [join] << old_where << where
    end
  else
    where
  end
  self.dup.tap do |r|
    r.set_option(:where, new_where)
    r.set_option(:join, "and")
  end
end