Class: ActiveRecord::Relation::Merger

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

Overview

:nodoc:

Constant Summary collapse

NORMAL_VALUES = 
Relation::VALUE_METHODS - Relation::CLAUSE_METHODS -
[
  :select, :includes, :preload, :joins, :left_outer_joins,
  :order, :reverse_order, :lock, :create_with, :reordering
]

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(relation, other) ⇒ Merger

Returns a new instance of Merger.



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# File 'lib/active_record/relation/merger.rb', line 46

def initialize(relation, other)
  @relation = relation
  @values   = other.values
  @other    = other
end

Instance Attribute Details

#other ⇒ Object (readonly)

Returns the value of attribute other.



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# File 'lib/active_record/relation/merger.rb', line 44

def other
  @other
end

#relation ⇒ Object (readonly)

Returns the value of attribute relation.



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# File 'lib/active_record/relation/merger.rb', line 44

def relation
  @relation
end

#values ⇒ Object (readonly)

Returns the value of attribute values.



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# File 'lib/active_record/relation/merger.rb', line 44

def values
  @values
end

Instance Method Details

#merge ⇒ Object 



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# File 'lib/active_record/relation/merger.rb', line 58

def merge
  NORMAL_VALUES.each do |name|
    value = values[name]
    # The unless clause is here mostly for performance reasons (since the `send` call might be moderately
    # expensive), most of the time the value is going to be `nil` or `.blank?`, the only catch is that
    # `false.blank?` returns `true`, so there needs to be an extra check so that explicit `false` values
    # don't fall through the cracks.
    unless value.nil? || (value.blank? && false != value)
      relation.public_send(:"#{name}!", *value)
    end
  end

  relation.none! if other.null_relation?

  merge_select_values
  merge_multi_values
  merge_single_values
  merge_clauses
  merge_preloads
  merge_joins
  merge_outer_joins

  relation
end