Class: Ultrasphinx::Fields

Inherits:
Object show all
Includes:
Singleton
Defined in:
lib/ultrasphinx/fields.rb

Overview

This is a special singleton configuration class that stores the index field configurations. Rather than using a magic hash and including relevant behavior in Ultrasphinx::Configure and Ultrasphinx::Search, we unify it here.

Constant Summary collapse

TYPE_MAP = 
{
  'string' => 'text', 
  'text' => 'text', 
  'integer' => 'integer', 
  'date' => 'date', 
  'datetime' => 'date',
  'timestamp' => 'date',
  'float' => 'float',
  'boolean' => 'integer'
}

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Fields

Returns a new instance of Fields.



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# File 'lib/ultrasphinx/fields.rb', line 24

def initialize
  @types = {}
  @classes = Hash.new([])
  @groups = []
end

Instance Attribute Details

#classes ⇒ Object

Returns the value of attribute classes.



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# File 'lib/ultrasphinx/fields.rb', line 22

def classes
  @classes
end

#types ⇒ Object

Returns the value of attribute types.



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# File 'lib/ultrasphinx/fields.rb', line 22

def types
  @types
end

Instance Method Details

#cast(source_string, field) ⇒ Object 



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# File 'lib/ultrasphinx/fields.rb', line 61

def cast(source_string, field)
  if types[field] == "date"
    "UNIX_TIMESTAMP(#{source_string})"
  elsif types[field] == "integer"
    source_string # "CAST(#{source_string} AS UNSIGNED)"
  else
    source_string              
  end + " AS #{field}"
end

#configure(configuration) ⇒ Object 



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# File 'lib/ultrasphinx/fields.rb', line 86

def configure(configuration)

  configuration.each do |model, options|        

    klass = model.constantize        
    save_and_verify_type('class_id', 'integer', nil, klass)
    save_and_verify_type('class', 'string', nil, klass)
            
    begin
    
      # Fields are from the model
      # We destructively canonicize them back onto the configuration hash
      options['fields'] = options['fields'].to_a.map do |entry|
        entry = {'field' => entry} unless entry.is_a? Hash

        extract_table_alias!(entry, klass)
        extract_field_alias!(entry, klass)
        
        unless klass.columns_hash[entry['field']]
          # XXX I think this is here for migrations
          Ultrasphinx.say "warning: field #{entry['field']} is not present in #{model}"
        else
          save_and_verify_type(entry['as'], klass.columns_hash[entry['field']].type, entry['sortable'], klass)
          install_facets!(entry, klass)
        end            
      end  
      
      # Joins are whatever they are in the target       
      options['include'].to_a.each do |entry|
        extract_table_alias!(entry, klass)
        extract_field_alias!(entry, klass)

        save_and_verify_type(entry['as'] || entry['field'], entry['class_name'].constantize.columns_hash[entry['field']].type, entry['sortable'], klass)            
        install_facets!(entry, klass)
      end  
      
      # Regular concats are CHAR, group_concats are BLOB and need to be cast to CHAR
      options['concatenate'].to_a.each do |entry|
        extract_table_alias!(entry, klass) # XXX Doesn't actually do anything useful
        save_and_verify_type(entry['as'], 'text', entry['sortable'], klass) 
        install_facets!(entry, klass)
      end          
      
    rescue ActiveRecord::StatementInvalid
      Ultrasphinx.say "warning: model #{model} does not exist in the database yet"
    end  
  end
  
  self
end

#extract_field_alias!(entry, klass) ⇒ Object 



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# File 'lib/ultrasphinx/fields.rb', line 145

def extract_field_alias!(entry, klass)
  unless entry['as']    
    entry['as'] = entry['field'] 
  end
end

#extract_table_alias!(entry, klass) ⇒ Object 



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# File 'lib/ultrasphinx/fields.rb', line 151

def extract_table_alias!(entry, klass)
  unless entry['table']
    # Getting run twice; don't know why
    if entry['field'] and entry['field'].include? "."
      # This field is referenced by a table alias
      entry['table'], entry['field'] = entry['field'].split(".")
    else
      klass = entry['class_name'].constantize if entry['class_name']         
      entry['table'] = klass.table_name
    end
  end
end

#groups ⇒ Object 



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# File 'lib/ultrasphinx/fields.rb', line 30

def groups
  @groups.compact.sort_by do |string| 
    string[/= (.*)/, 1]
  end
end

#install_facets!(entry, klass) ⇒ Object 



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# File 'lib/ultrasphinx/fields.rb', line 137

def install_facets!(entry, klass)
  if entry['facet']
    save_and_verify_type(entry['as'], 'text', nil, klass) # source must be a string
    save_and_verify_type("#{entry['as']}_facet", 'integer', nil, klass)
  end
  entry
end

#null(field) ⇒ Object 



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# File 'lib/ultrasphinx/fields.rb', line 71

def null(field)      
  case types[field]
    when 'text'
      "''"
    when 'integer', 'float'
      "0"
    when 'date'
      "18000" # Midnight on 1/1/1970
    when nil
      raise "Field #{field} is missing"
    else
      raise "Field #{field} does not have a valid type #{types[field]}."
  end + " AS #{field}"
end

#save_and_verify_type(field, new_type, string_sortable, klass) ⇒ Object 



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# File 'lib/ultrasphinx/fields.rb', line 36

def save_and_verify_type(field, new_type, string_sortable, klass)
  # Smoosh fields together based on their name in the Sphinx query schema
  field, new_type = field.to_s, TYPE_MAP[new_type.to_s]

  if types[field]
    # Existing field name; verify its type
    raise ConfigurationError, "Column type mismatch for #{field.inspect}; was already #{types[field].inspect}, but is now #{new_type.inspect}." unless types[field] == new_type
    classes[field] = (classes[field] + [klass]).uniq

  else
    # New field      
    types[field] = new_type
    classes[field] = [klass]

    @groups << case new_type
      when 'float', 'integer'
        "sql_group_column = #{field}"
      when 'date'
        "sql_date_column = #{field}"
      when 'text' 
        "sql_str2ordinal_column = #{field}" if string_sortable
    end
  end
end