Class: Texticle::FullTextIndex

Inherits:
Object
  • Object
show all
Defined in:
lib/texticle/full_text_index.rb

Overview

:nodoc:

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, dictionary, model_class, &block) ⇒ FullTextIndex

Returns a new instance of FullTextIndex.



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# File 'lib/texticle/full_text_index.rb', line 5

def initialize name, dictionary, model_class, &block
  @name           = name
  @dictionary     = dictionary
  @model_class    = model_class
  @index_columns  = {}
  @string         = nil
  instance_eval(&block)
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(name, *args) ⇒ Object 



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# File 'lib/texticle/full_text_index.rb', line 49

def method_missing name, *args
  weight = args.shift || 'none'
  (index_columns[weight] ||= []) << name.to_s
end

Instance Attribute Details

#index_columns ⇒ Object

Returns the value of attribute index_columns.



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# File 'lib/texticle/full_text_index.rb', line 3

def index_columns
  @index_columns
end

Instance Method Details

#create ⇒ Object 



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# File 'lib/texticle/full_text_index.rb', line 14

def create
  @model_class.connection.execute create_sql
end

#create_sql ⇒ Object 



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# File 'lib/texticle/full_text_index.rb', line 22

def create_sql
  <<-eosql
    CREATE index #{@name}
    ON #{@model_class.table_name}
    USING gin((#{to_s}))
  eosql
end

#destroy ⇒ Object 



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# File 'lib/texticle/full_text_index.rb', line 18

def destroy
  @model_class.connection.execute destroy_sql
end

#destroy_sql ⇒ Object 



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# File 'lib/texticle/full_text_index.rb', line 30

def destroy_sql
  "DROP index IF EXISTS #{@name}"
end

#to_s ⇒ Object 



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# File 'lib/texticle/full_text_index.rb', line 34

def to_s
  return @string if @string
  vectors = []
  @index_columns.sort_by { |k,v| k }.each do |weight, columns|
    c = columns.map { |x| "coalesce(#{@model_class.table_name}.#{x}, '')" }
    if weight == 'none'
      vectors << "to_tsvector('#{@dictionary}', #{c.join(" || ' ' || ")})"
    else
      vectors <<
    "setweight(to_tsvector('#{@dictionary}', #{c.join(" || ' ' || ")}), '#{weight}')"
    end
  end
  @string = vectors.join(" || ' ' || ")
end