Class: Rails::Clean::Schema::Analyzer

Inherits:
Object
  • Object
show all
Defined in:
lib/rails/clean/schema/analyzer.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Analyzer

Returns a new instance of Analyzer.



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# File 'lib/rails/clean/schema/analyzer.rb', line 6

def initialize
  @schema_info = ActiveRecord::Base.connection.tables.index_with do |table|
    {
      columns: ActiveRecord::Base.connection.columns(table).map(&:name),
      indexes: ActiveRecord::Base.connection.indexes(table).map(&:columns).flatten
    }
  end

  @model_info = ActiveRecord::Base.descendants.select do |model|
    model.table_exists? && !model.abstract_class?
  end.index_with do |model|
    {
      table: model.table_name,
      columns: model.column_names
    }
  end
end

Instance Method Details

#run ⇒ Object 



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# File 'lib/rails/clean/schema/analyzer.rb', line 24

def run
  unused_tables = @schema_info.keys - @model_info.values.map { |info| info[:table] }

  unused_columns = {}
  @model_info.each do |model, info|
    table = info[:table]
    next unless @schema_info[table]

    schema_columns = @schema_info[table][:columns]
    model_columns = info[:columns]
    unused = schema_columns - model_columns
    unused_columns[table] = unused if unused.any?
  end

  {
    unused_tables: unused_tables,
    unused_columns: unused_columns
  }
end