Class: RedisMemo::MemoizeQuery::CachedSelect::BindParams

Inherits:
Object
  • Object
show all
Defined in:
lib/redis_memo/memoize_query/cached_select/bind_params.rb

Instance Method Summary collapse

Instance Method Details

#memoizable? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/redis_memo/memoize_query/cached_select/bind_params.rb', line 111

def memoizable?
  return false if params.empty?

  params.each do |model, attrs_set|
    return false if attrs_set.empty?

    attrs_set.each do |attrs|
      return false unless RedisMemo::MemoizeQuery
        .memoized_columns(model)
        .include?(attrs.keys.sort)
    end
  end

  true
end

#params ⇒ Object 



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# File 'lib/redis_memo/memoize_query/cached_select/bind_params.rb', line 5

def params
  #
  # Bind params is hash of sets: each key is a model class, each value is a
  # set of hashes for memoized column conditions. Example:
  #
  #   {
  #      Site => [
  #        {name: 'a', city: 'b'},
  #        {name: 'a', city: 'c'},
  #        {name: 'b', city: 'b'},
  #        {name: 'b', city: 'c'},
  #      ],
  #   }
  #
  @params ||= Hash.new do |models, model|
    models[model] = []
  end
end

#product(other) ⇒ Object 



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# File 'lib/redis_memo/memoize_query/cached_select/bind_params.rb', line 42

def product(other)
  #  Example:
  #
  #  and(
  #    [{a: 1}, {a: 2}],
  #    [{b: 1}, {b: 2}],
  #  )
  #
  #  =>
  #
  #  [
  #    {a: 1, b: 1},
  #    {a: 1, b: 2},
  #    {a: 2, b: 1},
  #    {a: 2, b: 2},
  #  ]
  return unless other

  # The tree is almost always right-heavy. Merge into the right node for better
  # performance.
  params.each do |model, attrs_set|
    next if attrs_set.empty?

    # The other model does not have any conditions so far: carry the
    # attributes over to the other node
    if other.params[model].empty?
      other.params[model] = attrs_set
      next
    end

    # Distribute the current attrs into the other
    other_attrs_set_size = other.params[model].size
    other_attrs_set = other.params[model]
    merged_attrs_set = Array.new(other_attrs_set_size * attrs_set.size)

    attrs_set.each_with_index do |attrs, i|
      other_attrs_set.each_with_index do |other_attrs, j|
        k = i * other_attrs_set_size + j
        merged_attrs = merged_attrs_set[k] = other_attrs.dup
        attrs.each do |name, val|
          # Conflict detected. For example:
          #
          #   (a = 1 or b = 1) and (a = 2 or b = 2)
          #
          #  Keep:     a = 1 and b = 2, a = 2 and b = 1
          #  Discard:  a = 1 and a = 2, b = 1 and b = 2
          if merged_attrs.include?(name) && merged_attrs[name] != val
            merged_attrs_set[k] = nil
            break
          end

          merged_attrs[name] = val
        end
      end
    end

    merged_attrs_set.compact!
    other.params[model] = merged_attrs_set
  end

  other
end

#union(other) ⇒ Object 



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# File 'lib/redis_memo/memoize_query/cached_select/bind_params.rb', line 24

def union(other)
  return unless other

  # The tree is almost always right-heavy. Merge into the right node for better
  # performance.
  other.params.merge!(params) do |_, other_attrs_set, attrs_set|
    if other_attrs_set.empty?
      attrs_set
    elsif attrs_set.empty?
      other_attrs_set
    else
      attrs_set + other_attrs_set
    end
  end

  other
end

#uniq! ⇒ Object 



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# File 'lib/redis_memo/memoize_query/cached_select/bind_params.rb', line 105

def uniq!
  params.each do |_, attrs_set|
    attrs_set.uniq!
  end
end