Module: Litetags::ClassMethods

Defined in:
lib/litetags.rb

Instance Method Summary collapse

Instance Method Details

#tag_columns(*column_names) ⇒ Object 



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# File 'lib/litetags.rb', line 12

def tag_columns(*column_names)
  @tag_columns ||= {}

  tag_columns_sanitize_list(column_names).each do |column_name|
    @tag_columns[column_name] ||= false
  end

  @tag_columns.each do |column_name, initialized|
    next if initialized

    column_name = column_name.to_s
    method_name = column_name.downcase

    # JSON_EACH("{table}"."{column}")
    json_each = Arel::Nodes::NamedFunction.new("JSON_EACH", [arel_table[column_name]])

    # SELECT DISTINCT value FROM "{table}", JSON_EACH("{table}"."{column}")
    define_singleton_method :"unique_#{method_name}" do |conditions = "true"|
      select("value")
        .from([arel_table, json_each])
        .distinct
        .pluck("value")
        .sort
    end

    # SELECT value, COUNT(*) AS count FROM "{table}", JSON_EACH("{table}"."{column}") GROUP BY value ORDER BY value
    define_singleton_method :"#{method_name}_cloud" do |conditions = "true"|
      select("value")
        .from([arel_table, json_each])
        .group("value")
        .order("value")
        .pluck(Arel.sql("value, COUNT(*) AS count"))
        .to_h
    end

    # SELECT "{table}".* FROM "{table}" WHERE "{table}"."{column}" IS NOT NULL AND "{table}"."{column}" != '[]'
    scope :"with_#{method_name}", -> {
      where.not(arel_table[column_name].eq(nil))
        .where.not(arel_table[column_name].eq([]))
    }

    # SELECT "{table}".* FROM "{table}" WHERE ("{table}"."{column}" IS NULL OR "{table}"."{column}" = '[]')
    scope :"without_#{method_name}", -> {
      where(arel_table[column_name].eq(nil))
        .or(where(arel_table[column_name].eq([])))
    }

    # SELECT "{table}".* FROM "{table}" WHERE EXISTS (SELECT 1 FROM JSON_EACH("{table}"."{column}") WHERE value IN ({values}) LIMIT 1)
    scope :"with_any_#{method_name}", ->(*items) {
      values = tag_columns_sanitize_list(items)
      overlap = Arel::SelectManager.new(json_each)
        .project(1)
        .where(Arel.sql("value").in(values))
        .take(1)
        .exists

      where overlap
    }

    # SELECT "{table}".* FROM "{table}" WHERE (SELECT COUNT(*) FROM JSON_EACH("{table}"."{column}") WHERE value IN ({values})) = {values.size};
    scope :"with_all_#{method_name}", ->(*items) {
      values = tag_columns_sanitize_list(items)
      count = Arel::SelectManager.new(json_each)
        .project(Arel.star.count)
        .where(Arel.sql("value").in(values))
      contains = Arel::Nodes::Equality.new(count, values.size)

      where contains
    }

    # SELECT "{table}".* FROM "{table}" WHERE NOT EXISTS (SELECT 1 FROM JSON_EACH("{table}"."{column}") WHERE value IN ({values}) LIMIT 1)
    scope :"without_any_#{method_name}", ->(*items) {
      values = tag_columns_sanitize_list(items)
      overlap = Arel::SelectManager.new(json_each)
        .project(1)
        .where(Arel.sql("value").in(values))
        .take(1)
        .exists
      where.not overlap
    }

    # SELECT "{table}".* FROM "{table}" WHERE (SELECT COUNT(*) FROM JSON_EACH("{table}"."{column}") WHERE value IN ({values})) != {values.size};
    scope :"without_all_#{method_name}", ->(*items) {
      values = tag_columns_sanitize_list(items)
      count = Arel::SelectManager.new(json_each)
        .project(Arel.star.count)
        .where(Arel.sql("value").in(values))
      contains = Arel::Nodes::Equality.new(count, values.size)
      where.not contains
    }

    before_validation -> { self[column_name] = self.class.tag_columns_sanitize_list(self[column_name]) }

    define_method :"has_any_#{method_name}?" do |*values|
      values = self.class.tag_columns_sanitize_list(values)
      existing = self.class.tag_columns_sanitize_list(self[column_name])
      (values & existing).present?
    end

    define_method :"has_all_#{method_name}?" do |*values|
      values = self.class.tag_columns_sanitize_list(values)
      existing = self.class.tag_columns_sanitize_list(self[column_name])
      (values & existing).size == values.size
    end

    alias_method :"has_#{method_name.singularize}?", :"has_all_#{method_name}?"

    @tag_columns[column_name] = true
  end
end

#tag_columns_sanitize_list(values = []) ⇒ Object 



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# File 'lib/litetags.rb', line 123

def tag_columns_sanitize_list(values = [])
  return [] if values.nil?
  values.select(&:present?).map(&:to_s).uniq.sort
end