Class: Trains::Visitor::Model

Inherits:
Base
  • Object
show all
Defined in:
lib/trains/visitor/model.rb

Overview

Visit ActiveRecord models and add migrations for reference fields

Constant Summary collapse

POSSIBLE_ASSOCIATIONS = 
%i[
  has_many
  belongs_to
  has_one
  has_and_belongs_to_many
  ignored_columns=
].freeze
MODEL_PARENT_CLASSES = 
%w[
  ApplicationRecord
  ActiveRecord::Base
].freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Model

skipcq: RB-LI1087



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# File 'lib/trains/visitor/model.rb', line 21

def initialize
  @result = []
end

Instance Attribute Details

#result ⇒ Object (readonly)

Returns the value of attribute result.



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# File 'lib/trains/visitor/model.rb', line 18

def result
  @result
end

Instance Method Details

#on_class(node) ⇒ Object 



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# File 'lib/trains/visitor/model.rb', line 25

def on_class(node)
  return unless node.parent_class
  return unless MODEL_PARENT_CLASSES.include? node.parent_class.source

  @model_class = node.identifier.source
  node.each_descendant(:send) { |send_node| parse_model(send_node) }
end

#parse_model(node) ⇒ Object 



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# File 'lib/trains/visitor/model.rb', line 33

def parse_model(node)
  return unless POSSIBLE_ASSOCIATIONS.include?(node.method_name)

  if node.method_name == :ignored_columns=
    return if node.arguments.nil?
    return unless node.arguments.first.is_a? RuboCop::AST::ArrayNode

    arguments = node.arguments.first.to_a
    arguments = arguments.select do |child|
      child.is_a?(RuboCop::AST::SymbolNode) || child.is_a?(RuboCop::AST::StrNode)
    end.map(&:value)

    @result << DTO::Migration.new(
      @model_class,
      :ignore_column,
      [*arguments.map { |arg| DTO::Field.new(arg.to_sym, nil) }],
      nil
    )

    return
  end

  @result << DTO::Migration.new(
    @model_class,
    :add_column,
    [DTO::Field.new(node.arguments.first.value.to_sym, :bigint)],
    nil
  )

  return unless node.method_name == :has_and_belongs_to_many

  @result <<
    DTO::Migration.new(
      node.arguments.first.value.to_s.singularize.camelize,
      :add_column,
      [DTO::Field.new(@model_class.tableize.to_sym, :bigint)],
      nil
    )
end