Class: ROM::Processor::Transproc
- Inherits:
-
ROM::Processor
- Object
- ROM::Processor
- ROM::Processor::Transproc
- Includes:
- Transproc::Composer
- Defined in:
- lib/rom/processor/transproc.rb
Overview
Data mapping transformer builder using Transproc
This builds a transproc function that is used to map a whole relation
Defined Under Namespace
Modules: Functions
Instance Attribute Summary collapse
-
#header ⇒ Header
readonly
private
Header from a mapper.
-
#mapping ⇒ Hash
readonly
private
Header’s attribute mapping.
-
#model ⇒ Class
readonly
private
Model class from a mapper.
-
#row_proc ⇒ Proc
readonly
private
Row-processing proc.
Class Method Summary collapse
-
.build(header) ⇒ Transproc::Function
private
Build a transproc function from the header.
Instance Method Summary collapse
-
#initialize(header) ⇒ Transproc
constructor
private
A new instance of Transproc.
-
#to_transproc ⇒ Transproc::Function
private
Coerce mapper header to a transproc data mapping function.
Methods inherited from ROM::Processor
Constructor Details
#initialize(header) ⇒ Transproc
This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.
Returns a new instance of Transproc.
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# File 'lib/rom/processor/transproc.rb', line 66 def initialize(header) @header = header @model = header.model @mapping = header.mapping initialize_row_proc end |
Instance Attribute Details
#header ⇒ Header (readonly)
This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.
Returns header from a mapper.
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# File 'lib/rom/processor/transproc.rb', line 37 def header @header end |
#mapping ⇒ Hash (readonly)
This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.
Returns header’s attribute mapping.
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# File 'lib/rom/processor/transproc.rb', line 47 def mapping @mapping end |
#model ⇒ Class (readonly)
This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.
Returns model class from a mapper.
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# File 'lib/rom/processor/transproc.rb', line 42 def model @model end |
#row_proc ⇒ Proc (readonly)
This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.
Returns row-processing proc.
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# File 'lib/rom/processor/transproc.rb', line 52 def row_proc @row_proc end |
Class Method Details
.build(header) ⇒ Transproc::Function
This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.
Build a transproc function from the header
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# File 'lib/rom/processor/transproc.rb', line 61 def self.build(header) new(header).to_transproc end |
Instance Method Details
#to_transproc ⇒ Transproc::Function
This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.
Coerce mapper header to a transproc data mapping function
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# File 'lib/rom/processor/transproc.rb', line 78 def to_transproc compose(t(:identity)) do |ops| combined = header.combined ops << t(:combine, combined.map(&method(:combined_args))) if combined.any? ops << header.preprocessed.map { |attr| visit(attr, true) } ops << t(:map_array, row_proc) if row_proc ops << header.postprocessed.map { |attr| visit(attr, true) } end end |