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Module: Mongo::Options::Mapper

Relationships & Source Files
Defined in: lib/mongo/options/mapper.rb

Overview

Utility class for various options mapping behavior.

Since:

  • 2.0.0

Instance Method Summary

Instance Method Details

#transform(options, mappings) ⇒ Hash

Transforms the provided options to a new set of options given the provided mapping.

::Mongo::Options which are not present in the provided mapping are returned unmodified.

Examples:

Transform the options.

Mapper.transform({ name: 1 }, { :name => :nombre })

Parameters:

  • options (Hash) —

    The options to transform

  • mappings (Hash) —

    The key mappings.

Returns:

  • (Hash) —

    The transformed options.

Since:

  • 2.0.0

[ GitHub ] 

  


# File 'lib/mongo/options/mapper.rb', line 42



def transform(options, mappings)
  map = transform_keys_to_strings(mappings)
  opts = transform_keys_to_strings(options)
  opts.reduce({}) do |transformed, (key, value)|
    if map[key]
      transformed[map[key]] = value
    else
      transformed[key] = value
    end
    transformed
  end
end


  








  

    #transform_documents(options, mappings, document = BSON::Document.new)  ⇒ BSON::Document 
  



  

    

Transforms the provided options to a new set of options given the provided mapping. Expects BSON::Documents in and out so no explicit string conversion needs to happen.


  





    

    
Examples:

        


Transform the options.



      
Mapper.transform_documents({ name: 1 }, { :name => :nombre })

  


Parameters:


    
  
  • 
    options
    (BSON::Document)
—    
    

    The options to transform
    

    
  
    • 
  
  • 
    mappings
    (BSON::Document)
—    
    

    The key mappings.
    

    
  
    • 
  
  • 
    document
    (BSON::Document)
    (defaults to: BSON::Document.new)
—    
    

    The output document.
    

    
  
    • 



Returns:


    
  
  • 
    (BSON::Document)
—    
    

    The transformed options.
    

    
  
    • 



Since:


    
  
  • 
    
    

    2.0.0
    

    
  
    • 





  [ GitHub ]


  

  


# File 'lib/mongo/options/mapper.rb', line 69



def transform_documents(options, mappings, document = BSON::Document.new)
  options.reduce(document) do |transformed, (key, value)|
    name = mappings[key]
    transformed[name] = value if name && !value.nil?
    transformed
  end
end


  








  

    #transform_keys_to_strings(options)  ⇒ Hash 
  



  

    

Coverts all the keys of the options to strings.


  





    

    
Examples:

        


Convert all option keys to strings.



      
Mapper.transform({ :name => 1 })

  


Parameters:


    
  
  • 
    options
    (Hash)
—    
    

    The options to transform.
    

    
  
    • 



Returns:


    
  
  • 
    (Hash)
—    
    

    The transformed options.
    

    
  
    • 



Since:


    
  
  • 
    
    

    2.0.0
    

    
  
    • 





  [ GitHub ]


  

  


# File 'lib/mongo/options/mapper.rb', line 87



def transform_keys_to_strings(options)
  options.reduce({}) do |transformed, (key, value)|
    transformed[key.to_s] = value
    transformed
  end
end


  








  

    #transform_keys_to_symbols(options)  ⇒ Hash 
  



  

    

Coverts all the keys of the options to symbols.


  





    

    
Examples:

        


Convert all option keys to symbols.



      
Mapper.transform({ 'name' => 1 })

  


Parameters:


    
  
  • 
    options
    (Hash)
—    
    

    The options to transform.
    

    
  
    • 



Returns:


    
  
  • 
    (Hash)
—    
    

    The transformed options.
    

    
  
    • 



Since:


    
  
  • 
    
    

    2.2.2
    

    
  
    • 





  [ GitHub ]


  

  


# File 'lib/mongo/options/mapper.rb', line 104



def transform_keys_to_symbols(options)
  options.reduce({}) do |transformed, (key, value)|
    transformed[key.to_sym] = value
    transformed
  end
end


  








  

    #transform_values_to_strings(options)  ⇒ Hash 
  



  

    

Coverts all the symbol values to strings.


  





    

    
Examples:

        


Convert all option symbol values to strings.



      
Mapper.transform({ :name => 1 })

  


Parameters:


    
  
  • 
    options
    (Hash)
—    
    

    The options to transform.
    

    
  
    • 



Returns:


    
  
  • 
    (Hash)
—    
    

    The transformed options.
    

    
  
    • 



Since:


    
  
  • 
    
    

    2.0.0
    

    
  
    • 





  [ GitHub ]


  

  


# File 'lib/mongo/options/mapper.rb', line 121



def transform_values_to_strings(options)
  options.reduce({}) do |transformed, (key, value)|
    transformed[key] = value.is_a?(Symbol) ? value.to_s : value
    transformed
  end
end