Class: ActiveRecord::Relation::HashMerger

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

Overview

:nodoc:

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(relation, hash) ⇒ HashMerger

Returns a new instance of HashMerger.


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# File 'lib/active_record/relation/merger.rb', line 10

def initialize(relation, hash)
  hash.assert_valid_keys(*Relation::VALUE_METHODS)

  @relation = relation
  @hash     = hash
end

Instance Attribute Details

#hashObject (readonly)

Returns the value of attribute hash


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# File 'lib/active_record/relation/merger.rb', line 8

def hash
  @hash
end

#relationObject (readonly)

Returns the value of attribute relation


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# File 'lib/active_record/relation/merger.rb', line 8

def relation
  @relation
end

Instance Method Details

#mergeObject

:nodoc:


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# File 'lib/active_record/relation/merger.rb', line 17

def merge #:nodoc:
  Merger.new(relation, other).merge
end

#otherObject

Applying values to a relation has some side effects. E.g. interpolation might take place for where values. So we should build a relation to merge in rather than directly merging the values.


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# File 'lib/active_record/relation/merger.rb', line 25

def other
  other = Relation.create(
    relation.klass,
    table: relation.table,
    predicate_builder: relation.predicate_builder
  )
  hash.each { |k, v|
    if k == :joins
      if Hash === v
        other.joins!(v)
      else
        other.joins!(*v)
      end
    elsif k == :select
      other._select!(v)
    else
      other.send("#{k}!", v)
    end
  }
  other
end