Class: Exwiw::TableConfig

Inherits:
Object
  • Object
show all
Includes:
Serdes
Defined in:
lib/exwiw/table_config.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.from_symbol_keys(hash) ⇒ Object 



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# File 'lib/exwiw/table_config.rb', line 13

def self.from_symbol_keys(hash)
  from(JSON.parse(hash.to_json))
end

Instance Method Details

#belongs_to(table_name) ⇒ Object 



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# File 'lib/exwiw/table_config.rb', line 21

def belongs_to(table_name)
  belongs_tos.find { |relation| relation.table_name == table_name }
end

#build_extract_query(extract_target_table, extract_target_ids, tables_by_name) ⇒ Object 



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# File 'lib/exwiw/table_config.rb', line 25

def build_extract_query(extract_target_table, extract_target_ids, tables_by_name)
  # target is itself
  if name == extract_target_table
    return [{
      from: name,
      where: [{ primary_key => extract_target_ids }],
      join: [],
      select: column_names,
    }]
  end

  # it is not related to target table
  if belongs_to.empty?
    return [{
      from: name,
      where: [],
      join: [],
      select: column_names,
    }]
  end

  belongs_to_extract_target_table = belongs_tos.find { |relation| relation.table_name == extract_target_table }
  if belongs_to_extract_target_table
    key = belongs_to_extract_target_table.foreign_key
    return [{ from: name, where: [{ key => extract_target_ids }], join: [], select: column_names }]
  end

  ret = compute_dependency_to_table(extract_target_table, tables_by_name)

  if ret.empty?
    [{
      from: name,
      where: [],
      join: [],
      select: column_names,
    }]
  else
    last = ret.last
    last[:where] = [{ last[:foreign_key] => extract_target_ids }]
    ret
  end
end

#column_names ⇒ Object 



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# File 'lib/exwiw/table_config.rb', line 17

def column_names
  columns.map(&:name)
end

#merge(passed_table) ⇒ Object 



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# File 'lib/exwiw/table_config.rb', line 68

def merge(passed_table)
  return passed_table if passed_table.to_hash == self.to_hash


  TableConfig.new.tap do |merged_table|
    merged_table.name = name
    merged_table.primary_key = passed_table.primary_key
    merged_table.filter = filter
    merged_table.belongs_tos = passed_table.belongs_tos

    receiver_column_by_name = columns.each_with_object({}) { |column, hash| hash[column.name] = column }

    merged_table.columns =
      passed_table.columns.map do |passed_column|
        if receiver_column_by_name.key?(passed_column.name)
          receiver_column = receiver_column_by_name[passed_column.name]
          receiver_column
        else
          passed_column
        end
      end
  end
end