Class: DeclareSchema::Model::HabtmModelShim

Inherits:
Object
  • Object
show all
Defined in:
lib/declare_schema/model/habtm_model_shim.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(join_table, foreign_keys, parent_table_names) ⇒ HabtmModelShim

Returns a new instance of HabtmModelShim.



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# File 'lib/declare_schema/model/habtm_model_shim.rb', line 15

def initialize(join_table, foreign_keys, parent_table_names)
  foreign_keys.is_a?(Array) && foreign_keys.size == 2 or
    raise ArgumentError, "foreign_keys must be <Array[2]>; got #{foreign_keys.inspect}"
  parent_table_names.is_a?(Array) && parent_table_names.size == 2 or
    raise ArgumentError, "parent_table_names must be <Array[2]>; got #{parent_table_names.inspect}"
  @join_table = join_table
  @foreign_keys = foreign_keys.sort # Rails requires these be in alphabetical order
  @parent_table_names = @foreign_keys == foreign_keys ? parent_table_names : parent_table_names.reverse # match the above sort
end

Instance Attribute Details

#foreign_keys ⇒ Object (readonly)

Returns the value of attribute foreign_keys.



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# File 'lib/declare_schema/model/habtm_model_shim.rb', line 13

def foreign_keys
  @foreign_keys
end

#join_table ⇒ Object (readonly)

Returns the value of attribute join_table.



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# File 'lib/declare_schema/model/habtm_model_shim.rb', line 13

def join_table
  @join_table
end

#parent_table_names ⇒ Object (readonly)

Returns the value of attribute parent_table_names.



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# File 'lib/declare_schema/model/habtm_model_shim.rb', line 13

def parent_table_names
  @parent_table_names
end

Class Method Details

.from_reflection(refl) ⇒ Object 



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# File 'lib/declare_schema/model/habtm_model_shim.rb', line 7

def from_reflection(refl)
  new(refl.join_table, [refl.foreign_key, refl.association_foreign_key],
                       [refl.active_record.table_name, refl.class_name.constantize.table_name])
end

Instance Method Details

#_declared_primary_key ⇒ Object 



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# File 'lib/declare_schema/model/habtm_model_shim.rb', line 43

def _declared_primary_key
  foreign_keys
end

#_table_options ⇒ Object 



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# File 'lib/declare_schema/model/habtm_model_shim.rb', line 25

def _table_options
  {}
end

#constraint_specs ⇒ Object 



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# File 'lib/declare_schema/model/habtm_model_shim.rb', line 64

def constraint_specs
  [
    ForeignKeyDefinition.new(foreign_keys.first, child_table: @join_table, parent_table: parent_table_names.first, constraint_name: "#{join_table}_FK1", dependent: :delete),
    ForeignKeyDefinition.new(foreign_keys.last, child_table: @join_table, parent_table: parent_table_names.last, constraint_name: "#{join_table}_FK2", dependent: :delete)
  ]
end

#field_specs ⇒ Object 



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# File 'lib/declare_schema/model/habtm_model_shim.rb', line 33

def field_specs
  foreign_keys.each_with_index.each_with_object({}) do |(foreign_key, i), result|
    result[foreign_key] = ::DeclareSchema::Model::FieldSpec.new(self, foreign_key, :bigint, position: i, null: false)
  end
end

#ignore_indexes ⇒ Object 



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# File 'lib/declare_schema/model/habtm_model_shim.rb', line 60

def ignore_indexes
  []
end

#index_definitions ⇒ Object 



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# File 'lib/declare_schema/model/habtm_model_shim.rb', line 47

def index_definitions
  [
    IndexDefinition.new(foreign_keys.last, table_name: table_name, unique: false) # index for queries where we only have the last foreign key
  ]
end

#index_definitions_with_primary_key ⇒ Object 



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# File 'lib/declare_schema/model/habtm_model_shim.rb', line 53

def index_definitions_with_primary_key
  [
    *index_definitions,
    IndexDefinition.new(foreign_keys, name: Model::IndexDefinition::PRIMARY_KEY_NAME, unique: true) # creates a primary composite key on both foreign keys
  ]
end

#primary_key ⇒ Object 



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# File 'lib/declare_schema/model/habtm_model_shim.rb', line 39

def primary_key
  false # no single-column primary key in database
end

#table_name ⇒ Object 



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# File 'lib/declare_schema/model/habtm_model_shim.rb', line 29

def table_name
  join_table
end