Class: Ddr::Index::QueryClause

Inherits:
Object
  • Object
show all
Defined in:
lib/ddr/index/query_clause.rb

Constant Summary collapse

ANY_FIELD = 
Field.new('*').freeze
ANY_VALUE = 
"[* TO *]"
QUOTE = 
'"'
TERM_QUERY = 
"{!term f=%{field}}%{value}"
STANDARD_QUERY = 
"%{field}:%{value}"
NEGATIVE_QUERY = 
"-%{field}:%{value}"
DISJUNCTION = 
"{!lucene q.op=OR df=%{field}}%{value}"

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.absent(field) ⇒ Object

Builds a query clause to filter where field is NOT present (no values)



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# File 'lib/ddr/index/query_clause.rb', line 68

def absent(field)
  new(field: field, value: ANY_VALUE, template: NEGATIVE_QUERY)
end

.before(field, value) ⇒ Object Also known as: before_date_time

Builds a query clause to filter where date field value is earlier than a date/time value.



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# File 'lib/ddr/index/query_clause.rb', line 79

def before(field, value)
  new(field: field, value: "[* TO %s]" % Ddr::Utils.solr_date(value))
end

.before_days(field, value) ⇒ Object

Builds a query clause to filter where date field value is earlier than a number of days before now.



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# File 'lib/ddr/index/query_clause.rb', line 85

def before_days(field, value)
  new(field: field, value: "[* TO NOW-%iDAYS]" % value)
end

.disjunction(field, values) ⇒ Object

Builds a query clause to filter where field contains at least one of a set of values.



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# File 'lib/ddr/index/query_clause.rb', line 73

def disjunction(field, values)
  value = values.map { |v| quote(v) }.join(" ")
  new(field: field, value: value, template: DISJUNCTION)
end

.negative(field, value) ⇒ Object

Builds a query clause to filter where field does not have the given value.



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# File 'lib/ddr/index/query_clause.rb', line 58

def negative(field, value)
  new(field: field, value: value, template: NEGATIVE_QUERY, quote_value: true)
end

.present(field) ⇒ Object

Builds a query clause to filter where field is present (i.e, has any value)



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# File 'lib/ddr/index/query_clause.rb', line 63

def present(field)
  new(field: field, value: ANY_VALUE)
end

.quote(value) ⇒ Object 



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# File 'lib/ddr/index/query_clause.rb', line 33

def quote(value)
  # Derived from Blacklight::Solr::SearchBuilderBehavior#solr_param_quote
  unless value =~ /\A[a-zA-Z0-9$_\-\^]+\z/
    QUOTE + value.gsub("'", "\\\\\'").gsub('"', "\\\\\"") + QUOTE
  else
    value
  end
end

.term(field, value) ⇒ Object

Builds a “term query” clause to filter where field contains value.



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# File 'lib/ddr/index/query_clause.rb', line 90

def term(field, value)
  new(field: field, value: value, template: TERM_QUERY)
end

.unique_key(value) ⇒ Object Also known as: id

Builds a query clause to retrieve the index document by unique key.



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# File 'lib/ddr/index/query_clause.rb', line 43

def unique_key(value)
  term(UniqueKeyField.instance, value)
end

.where(field, value) ⇒ Object 



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# File 'lib/ddr/index/query_clause.rb', line 48

def where(field, value)
   values = Array(value)
  if values.size > 1
    disjunction(field, values)
  else
    new(field: field, value: values.first, quote_value: true)
  end
end

Instance Method Details

#quote(value) ⇒ Object 



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# File 'lib/ddr/index/query_clause.rb', line 27

def quote(value)
  self.class.quote(value)
end

#to_s ⇒ Object 



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# File 'lib/ddr/index/query_clause.rb', line 23

def to_s
  template % { field: field, value: quote_value ? quote(value) : value }
end