Class: EvilSeed::RelationDumper

Inherits:
Object
  • Object
show all
Defined in:
lib/evil_seed/relation_dumper.rb

Overview

This class performs actual dump generation for single relation and all its not yet loaded dependencies

- Fetches all tuples for root (it does not instantiate AR records but it casts values to Ruby types)
- Extracts foreign key values for all belongs_to associations
- Dumps belongs_to associations(recursion!)
- Dumps all tuples for root, writes them in file
- Dumps all other associations (recursion!)
- Returns all results to caller in correct order

TODO: This class obviously breaks SRP principle and thus should be split!

Constant Summary collapse

MAX_IDENTIFIERS_IN_IN_STMT = 
1_000

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(relation, root_dumper, association_path, **options) ⇒ RelationDumper

Returns a new instance of RelationDumper.



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# File 'lib/evil_seed/relation_dumper.rb', line 33

def initialize(relation, root_dumper, association_path, **options)
  @relation               = relation
  @root_dumper            = root_dumper
  @verbose                = configuration.verbose
  @identifiers            = options[:identifiers]
  @to_load_map            = Hash.new { |h, k| h[k] = [] }
  @foreign_keys           = Hash.new { |h, k| h[k] = [] }
  @loaded_ids             = []
  @model_class            = relation.klass
  @search_key             = options[:search_key] || model_class.primary_key
  @association_path       = association_path
  @inverse_reflection     = options[:inverse_of]
  @record_dumper          = configuration.record_dumper_class.new(model_class, configuration, self)
  @nullify_columns        = []
  @table_names            = {}
  @belongs_to_reflections = setup_belongs_to_reflections
  @has_many_reflections   = setup_has_many_reflections
  @options                = options
  @current_deep           = association_path.split('.').size
  @dont_nullify           = dont_nullify

  puts("- #{association_path}") if verbose
end

Instance Attribute Details

#association_path ⇒ Object (readonly)

Returns the value of attribute association_path.



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# File 'lib/evil_seed/relation_dumper.rb', line 26

def association_path
  @association_path
end

#belongs_to_reflections ⇒ Object (readonly)

Returns the value of attribute belongs_to_reflections.



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# File 'lib/evil_seed/relation_dumper.rb', line 26

def belongs_to_reflections
  @belongs_to_reflections
end

#current_deep ⇒ Object (readonly)

Returns the value of attribute current_deep.



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# File 'lib/evil_seed/relation_dumper.rb', line 26

def current_deep
  @current_deep
end

#foreign_keys ⇒ Object (readonly)

Returns the value of attribute foreign_keys.



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# File 'lib/evil_seed/relation_dumper.rb', line 26

def foreign_keys
  @foreign_keys
end

#has_many_reflections ⇒ Object (readonly)

Returns the value of attribute has_many_reflections.



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# File 'lib/evil_seed/relation_dumper.rb', line 26

def has_many_reflections
  @has_many_reflections
end

#identifiers ⇒ Object (readonly)

Returns the value of attribute identifiers.



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# File 'lib/evil_seed/relation_dumper.rb', line 26

def identifiers
  @identifiers
end

#inverse_reflection ⇒ Object (readonly)

Returns the value of attribute inverse_reflection.



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# File 'lib/evil_seed/relation_dumper.rb', line 26

def inverse_reflection
  @inverse_reflection
end

#loaded_ids ⇒ Object (readonly)

Returns the value of attribute loaded_ids.



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# File 'lib/evil_seed/relation_dumper.rb', line 26

def loaded_ids
  @loaded_ids
end

#model_class ⇒ Object (readonly)

Returns the value of attribute model_class.



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# File 'lib/evil_seed/relation_dumper.rb', line 26

def model_class
  @model_class
end

#nullify_columns ⇒ Object (readonly)

Returns the value of attribute nullify_columns.



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# File 'lib/evil_seed/relation_dumper.rb', line 26

def nullify_columns
  @nullify_columns
end

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/evil_seed/relation_dumper.rb', line 26

def options
  @options
end

#record_dumper ⇒ Object (readonly)

Returns the value of attribute record_dumper.



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# File 'lib/evil_seed/relation_dumper.rb', line 26

def record_dumper
  @record_dumper
end

#relation ⇒ Object (readonly)

Returns the value of attribute relation.



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# File 'lib/evil_seed/relation_dumper.rb', line 26

def relation
  @relation
end

#root_dumper ⇒ Object (readonly)

Returns the value of attribute root_dumper.



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# File 'lib/evil_seed/relation_dumper.rb', line 26

def root_dumper
  @root_dumper
end

#search_key ⇒ Object (readonly)

Returns the value of attribute search_key.



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# File 'lib/evil_seed/relation_dumper.rb', line 26

def search_key
  @search_key
end

#table_names ⇒ Object (readonly)

Returns the value of attribute table_names.



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# File 'lib/evil_seed/relation_dumper.rb', line 26

def table_names
  @table_names
end

#to_load_map ⇒ Object (readonly)

Returns the value of attribute to_load_map.



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# File 'lib/evil_seed/relation_dumper.rb', line 26

def to_load_map
  @to_load_map
end

#verbose ⇒ Object (readonly)

Returns the value of attribute verbose.



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# File 'lib/evil_seed/relation_dumper.rb', line 26

def verbose
  @verbose
end

Instance Method Details

#call ⇒ Array<IO>

Generate dump and write it into io

Returns:

  • (Array<IO>) —

    List of dump IOs for separate tables in order of dependencies (belongs_to are first)



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# File 'lib/evil_seed/relation_dumper.rb', line 59

def call
  dump!
  if deep_limit and current_deep > deep_limit
    [record_dumper.result].flatten.compact
  else
    belongs_to_dumps = dump_belongs_to_associations!
    has_many_dumps   = dump_has_many_associations!
    [belongs_to_dumps, record_dumper.result, has_many_dumps].flatten.compact
  end
end