Class: Arel::Middleware::Result

Inherits:
Object
  • Object
show all
Defined in:
lib/arel/middleware/result.rb

Overview

Class is very similar to ActiveRecord::Result activerecord/lib/active_record/result.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(from_caster, to_caster, original_data) ⇒ Result

Returns a new instance of Result.



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# File 'lib/arel/middleware/result.rb', line 22

def initialize(from_caster, to_caster, original_data)
  @from_caster = from_caster
  @to_caster = to_caster
  @original_data = original_data
  @modified = false
end

Instance Attribute Details

#original_data ⇒ Object (readonly)

Returns the value of attribute original_data.



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# File 'lib/arel/middleware/result.rb', line 16

def original_data
  @original_data
end

Class Method Details

.create(from:, to:, data:) ⇒ Object 



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# File 'lib/arel/middleware/result.rb', line 18

def self.create(from:, to:, data:)
  Result.new from, to, data
end

Instance Method Details

#column_objects ⇒ Object 



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# File 'lib/arel/middleware/result.rb', line 33

def column_objects
  @column_objects ||= from_caster.column_objects(original_data)
end

#columns ⇒ Object 



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# File 'lib/arel/middleware/result.rb', line 29

def columns
  @columns ||= column_objects.map(&:name)
end

#hash_rows ⇒ Object 



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# File 'lib/arel/middleware/result.rb', line 60

def hash_rows
  @hash_rows ||=
    begin
      rows.map do |row|
        hash = {}

        index = 0
        length = columns.length

        while index < length
          hash[columns[index]] = row[index]
          index += 1
        end

        hash
      end
    end
end

#modified? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arel/middleware/result.rb', line 83

def modified?
  @modified
end

#remove_column(column_name) ⇒ Object 



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# File 'lib/arel/middleware/result.rb', line 41

def remove_column(column_name)
  column_index = columns.index(column_name)
  raise "Unknown column `#{column_name}`. Existing columns: `#{columns}`" if column_index.nil?

  @hash_rows = nil
  @columns = nil
  @modified = true

  column_objects.delete_at(column_index)
  deleted_rows = []

  rows.map! do |row|
    deleted_rows << row.delete_at(column_index)
    row
  end

  deleted_rows
end

#rows ⇒ Object 



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# File 'lib/arel/middleware/result.rb', line 37

def rows
  @rows ||= from_caster.rows(original_data)
end

#to_casted_result ⇒ Object 



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# File 'lib/arel/middleware/result.rb', line 79

def to_casted_result
  to_caster.cast_to(self)
end