Class: Rapids::Batch::InsertInto

Inherits:
Object
  • Object
show all
Includes:
ModelExtensions
Defined in:
lib/rapids/batch/insert_into.rb

Instance Method Summary collapse

Methods included from ModelExtensions

#batch_table_name, #columns, #default_on_nil, #quote_bound_value, #sql_column_name

Constructor Details

#initialize(model, batch_definition, values, options = {}) ⇒ InsertInto

Returns a new instance of InsertInto.



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# File 'lib/rapids/batch/insert_into.rb', line 9

def initialize(model,batch_definition,values,options = {})
  @model = model
  @batch = batch_definition
  @values = values
  @options = options
end

Instance Method Details

#to_sql ⇒ Object 



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# File 'lib/rapids/batch/insert_into.rb', line 16

def to_sql
  columns_helper = ColumnsHelper.new(@model,@batch)
  insert_header_sql = columns_helper.map{|column,path|sql_column_name(column,path)}.join(",")
  
  values_sql = @values.map do |row|
    row_sql = columns_helper.map do |column,path|
      source_column_name = column.name
      destination_column = column
      
      @batch.find_or_creates.each do |find_or_create|
        if find_or_create.name == path.first && find_or_create.find_columns.any?{|fc|fc.is_a?(Array) && fc.first.to_s == column.name}
          source_column_name = find_or_create.find_columns.detect{|fc|fc.is_a?(Array) && fc.first.to_s == column.name}.last.to_s
        end
      end
    
      specific_object = path.inject(row) do |memo,hash_or_association_name|
        association_name = if hash_or_association_name.is_a?(Hash)
          hash_or_association_name[:name]
        else
          hash_or_association_name
        end
        if memo.respond_to?(association_name)
          memo.send(association_name)
        elsif memo.is_a?(Hash) && memo[association_name.to_s]
          memo[association_name.to_s]
        elsif association_name.is_a?(String)
          memo
        end
      end

      if specific_object.is_a?(Array)
        many_attributes = specific_object.map do |s|
          if s.is_a?(ActiveRecord::Base)
            s.instance_variable_get(:@attributes)[source_column_name]
          else
            s[source_column_name]
          end
        end.compact
        if many_attributes.empty?
          default_on_nil(nil,destination_column)
        else
          default_on_nil(many_attributes.sort.join(","),destination_column)
        end
      else
        val = if specific_object.is_a?(ActiveRecord::Base)
          specific_object.instance_variable_get(:@attributes)[source_column_name] #speeds things up a bit since it's not typed first before being quoted
        else
          specific_object[source_column_name]
        end
        default_on_nil(val,destination_column)
      end
    end
    "(#{row_sql.join(",")})".encode("utf-8", :undef => :replace, :replace => "")
  end.join(",")
  
  "INSERT INTO `#{batch_table_name}` (#{insert_header_sql}) VALUES #{values_sql}"
end