class Sunspot::DSL::Fulltext

This DSL exposes the functionality provided by Solr's fulltext Dismax handler.

Public Instance Methods

additive_boost(factor_or_function, &block) click to toggle source
# File lib/sunspot/dsl/fulltext.rb, line 174
def additive_boost(factor_or_function, &block)
  if factor_or_function.is_a?(Sunspot::Query::FunctionQuery)
    @query.add_additive_boost_function(factor_or_function)
  else
    Sunspot::Util.instance_eval_or_call(
      Scope.new(@query.create_boost_query(factor_or_function), @setup),
      &block
    )
  end
end
boost(factor_or_function, &block) click to toggle source

Boost queries allow specification of an arbitrary scope for which matching documents should receive an extra boost. You can either specify a boost factor and a block, or a boost function. The block is evaluated in the usual scope DSL, and field names are attribute fields, not text fields, as in other scope.

The boost function can be a constant (numeric or string literal), a field name or another function. You can build arbitrarily complex functions, which are passed transparently to solr.

This method can be called more than once for different boost queries with different boosts.

Example

Sunspot.search(Post) do
  keywords 'super fan' do
    boost(2.0) do
      with(:featured, true)
    end

    boost(function { sum(:average_rating, product(:popularity, 10)) })
  end
end

In the above search, featured posts will receive a boost of 2.0 and all posts will be boosted by (average_rating + popularity * 10).

# File lib/sunspot/dsl/fulltext.rb, line 170
def boost(factor_or_function, &block)
  additive_boost(factor_or_function, &block)
end
boost_fields(boosts) click to toggle source

Add boost to certain fields, without restricting which fields are searched.

Example

Sunspot.search(Post) do
  keywords('pork sandwich') do
    boost_fields :title => 1.5
  end
end
# File lib/sunspot/dsl/fulltext.rb, line 201
def boost_fields(boosts)
  boosts.each_pair do |field_name, boost|
    begin
      @setup.text_fields(field_name).each do |field|
        @query.add_fulltext_field(field, boost)
      end
    rescue Sunspot::UnrecognizedFieldError
      # We'll let this one slide.
    end
  end
end
exclude_fields(*field_names) click to toggle source

Exclude the given fields from the search. All fields that are configured for the types under search and not listed here will be searched.

# File lib/sunspot/dsl/fulltext.rb, line 57
def exclude_fields(*field_names)
  @exclude_fields.concat(field_names)
end
fields(*field_names) click to toggle source

Specify which fields to search. Field names specified as arguments are given default boost; field boosts can be specified by passing a hash of field names keyed to boost values as the last argument.

If you wish to boost certain fields without restricting which fields are searched, use boost_fields

Example

Sunspot.search(Post) do
  keywords 'search is cool' do
    fields(:body, :title => 2.0)
  end
end

This would search the :body field with default boost (1.0), and the :title field with a boost of 2.0

# File lib/sunspot/dsl/fulltext.rb, line 36
def fields(*field_names)
  @fields_added = true
  boosted_fields = field_names.pop if field_names.last.is_a?(Hash)
  field_names.each do |field_name|
    @setup.text_fields(field_name).each do |field|
      @query.add_fulltext_field(field, field.default_boost)
    end
  end
  if boosted_fields
    boosted_fields.each_pair do |field_name, boost|
      @setup.text_fields(field_name).each do |field|
        @query.add_fulltext_field(field, boost)
      end
    end
  end
end
highlight(*args) click to toggle source

Enable keyword highlighting for this search. By default, the fields under search will be highlighted; you may also may pass one or more symbol arguments indicating fields to be highlighted (they don't even have to be the same fields you're searching).

Example

Sunspot.search(Post) do
  keywords 'show me the highlighting' do
    highlight :title, :body
  end
end

You may also pass a hash of options as the last argument. Options are the following:

Full disclosure: I barely understand what these options actually do; this documentation is pretty much just copied from the (wiki.apache.org/solr/HighlightingParameters#head-23ecd5061bc2c86a561f85dc1303979fe614b956)[Solr Wiki]

:max_snippets

The maximum number of highlighted snippets to generate per field

:fragment_size

The number of characters to consider for a highlighted fragment

:merge_continuous_fragments

Collapse continuous fragments into a single fragment

:phrase_highlighter

Highlight phrase terms only when they appear within the query phrase in the document

:require_field_match

If true, a field will only be highlighted if the query matched in this particular field (only has an effect if :phrase_highlighter is true as well)

# File lib/sunspot/dsl/fulltext.rb, line 96
def highlight(*args)
  options = args.last.kind_of?(Hash) ? args.pop : {}
  fields = []
  args.each { |field_name| fields.concat(@setup.text_fields(field_name)) }

  @query.add_highlight(fields, options)
end
minimum_match(minimum_match) click to toggle source

The minimum number of search terms that a result must match. By default, all search terms must match; if the number of search terms is less than this number, the default behavior applies.

# File lib/sunspot/dsl/fulltext.rb, line 218
def minimum_match(minimum_match)
  @query.minimum_match = minimum_match
end
multiplicative_boost(factor_or_function) click to toggle source
# File lib/sunspot/dsl/fulltext.rb, line 185
def multiplicative_boost(factor_or_function)
  @query.add_multiplicative_boost_function(factor_or_function)
end
phrase_fields(boosted_fields) click to toggle source

Phrase fields are an awesome dismax feature that adds extra boost to documents for which all the fulltext keywords appear in close proximity in one of the given fields. Excellent for titles, headlines, etc.

Boosted fields are specified in a hash of field names to a boost, as with the fields and boost_fields methods.

Example

Sunspot.search(Post) do
  keywords 'nothing reveals like relevance' do
    phrase_fields :title => 2.0
  end
end
# File lib/sunspot/dsl/fulltext.rb, line 120
def phrase_fields(boosted_fields)
  if boosted_fields
    boosted_fields.each_pair do |field_name, boost|
      @setup.text_fields(field_name).each do |field|
        @query.add_phrase_field(field, boost)
      end
    end
  end
end
phrase_slop(slop) click to toggle source

The maximum number of words that can appear between search terms for a field to qualify for phrase field boost. See query_phrase_slop for examples. Phrase slop is only meaningful if phrase fields are specified (see phrase_fields), and it does not have an effect on which results are returned; only on what their respective boosts are.

# File lib/sunspot/dsl/fulltext.rb, line 137
def phrase_slop(slop)
  @query.phrase_slop = slop
end
query_phrase_slop(slop) click to toggle source

The number of words that can appear between the words in a user-entered phrase (i.e., keywords in quotes) and still match. For instance, in a search for “"great pizza"” with a query phrase slop of 1, “great pizza” and “great big pizza” will match, but “great monster of a pizza” will not. Default behavior is a query phrase slop of zero.

# File lib/sunspot/dsl/fulltext.rb, line 229
def query_phrase_slop(slop)
  @query.query_phrase_slop = slop
end
tie(tie) click to toggle source

A tiebreaker coefficient for scores derived from subqueries that are lower-scoring than the maximum score subquery. Typically a near-zero value is useful. See wiki.apache.org/solr/DisMaxRequestHandler#tie_.28Tie_breaker.29 for more information.

# File lib/sunspot/dsl/fulltext.rb, line 240
def tie(tie)
  @query.tie = tie
end