Class: Metka::Model

Inherits:
Module
  • Object
show all
Defined in:
lib/metka/model.rb

Instance Method Summary collapse

Constructor Details

#initialize(columns:, **options) ⇒ Model

Returns a new instance of Model.



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# File 'lib/metka/model.rb', line 17

def initialize(columns:, **options)
  @columns = columns.dup.freeze
  @options = options.dup.freeze
end

Instance Method Details

#included(base) ⇒ Object 



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# File 'lib/metka/model.rb', line 22

def included(base)
  columns = @columns
  parser = ->(tags) {
    @options[:parser] ? @options[:parser].call(tags) : Metka.config.parser.instance.call(tags)
  }

  # @param model [ActiveRecord::Base] model on which to execute search
  # @param tags [Object] list of tags, representation depends on parser used
  # @param options [Hash] options
  #   @option :join_operator [Metka::AND, Metka::OR]
  #   @option :on [Array<String>] list of column names to include in query
  # @returns ViewPost::ActiveRecord_Relation
  tagged_with_lambda = ->(model, tags, **options) {
    cols = options.delete(:on)
    parsed_tag_list = parser.call(tags)

    return model if parsed_tag_list.empty?

    request = ::Metka::QueryBuilder.new.call(model, cols, parsed_tag_list, options)
    model.where(request)
  }

  base.class_eval do
    columns.each do |column|
      scope "with_all_#{column}", ->(tags) { tagged_with(tags, on: [column]) }
      scope "with_any_#{column}", ->(tags) { tagged_with(tags, on: [column], any: true) }
      scope "without_all_#{column}", ->(tags) { tagged_with(tags, on: [column], exclude: true) }
      scope "without_any_#{column}", ->(tags) { tagged_with(tags, on: [column], any: true, exclude: true) }
    end

    unless respond_to?(:tagged_with)
      scope :tagged_with, ->(tags = '', options = {}) {
        options[:join_operator] ||= ::Metka::OR
        options = {any: false}.merge(options)
        options[:on] ||= columns

        tagged_with_lambda.call(self, tags, **options)
      }
    end
  end

  base.define_singleton_method :metka_cloud do |*columns|
    return [] if columns.blank?

    prepared_unnest = columns.map { |column| "#{table_name}.#{column}" }.join(' || ')
    subquery = all.select("UNNEST(#{prepared_unnest}) AS tag_name")

    unscoped.from(subquery).group(:tag_name).pluck(:tag_name, Arel.sql('COUNT(*) AS taggings_count'))
  end

  columns.each do |column|
    base.define_method(column.singularize + '_list=') do |v|
      write_attribute(column, parser.call(v).to_a)
      write_attribute(column, nil) if send(column).empty?
    end

    base.define_method(column.singularize + '_list') do
      parser.call(send(column))
    end

    base.define_singleton_method :"#{column.singularize}_cloud" do
      metka_cloud(column)
    end
  end
end