Class: ROM::SQL::Schema::Inferrer Private

Inherits:
ROM::Schema::Inferrer
  • Object
show all
Defined in:
lib/rom/sql/schema/inferrer.rb

This class is part of a private API. You should avoid using this class if possible, as it may be removed or be changed in the future.

Constant Summary collapse

FALLBACK_SCHEMA =

This constant is part of a private API. You should avoid using this constant if possible, as it may be removed or be changed in the future.

{
  attributes: EMPTY_ARRAY,
  indexes: EMPTY_SET,
  foreign_keys: EMPTY_SET
}.freeze

Instance Method Summary collapse

Instance Method Details

#call(schema, gateway) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.


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# File 'lib/rom/sql/schema/inferrer.rb', line 35

def call(schema, gateway)
  if enabled?
    infer_from_database(gateway, schema, **super)
  else
    infer_from_attributes(gateway, schema, **super)
  end
rescue Sequel::Error => error
  on_error(schema.name, error)
  { **FALLBACK_SCHEMA, indexes: schema.indexes }
end

#foreign_keys_from_attributes(attributes) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.


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# File 'lib/rom/sql/schema/inferrer.rb', line 106

def foreign_keys_from_attributes(attributes)
  attributes.
    select(&:foreign_key?).
    map { |attr| SQL::ForeignKey.new([attr.unwrap], attr.target) }.
    to_set
end

#foreign_keys_from_database(gateway, schema, attributes) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.


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# File 'lib/rom/sql/schema/inferrer.rb', line 86

def foreign_keys_from_database(gateway, schema, attributes)
  dataset = schema.name.dataset

  gateway.connection.foreign_key_list(dataset).map { |definition|
    columns, table, key = definition.values_at(:columns, :table, :key)
    attrs = columns.map { |name| attributes[name] }

    SQL::ForeignKey.new(attrs, table, parent_keys: key)
  }.to_set
end

#indexes_from_attributes(attributes) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.


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# File 'lib/rom/sql/schema/inferrer.rb', line 98

def indexes_from_attributes(attributes)
  attributes.
    select(&:indexed?).
    map { |attr| SQL::Index.new([attr.unwrap]) }.
    to_set
end

#indexes_from_database(gateway, schema, attributes) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.


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# File 'lib/rom/sql/schema/inferrer.rb', line 70

def indexes_from_database(gateway, schema, attributes)
  if gateway.connection.respond_to?(:indexes)
    dataset = schema.name.dataset

    gateway.connection.indexes(dataset).map { |index_name, definition|
      columns, unique = definition.values_at(:columns, :unique)
      attrs = columns.map { |name| attributes[name] }

      SQL::Index.new(attrs, name: index_name, unique: unique)
    }.to_set
  else
    EMPTY_SET
  end
end

#infer_from_attributes(_gateway, schema, attributes:, **rest) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.


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# File 'lib/rom/sql/schema/inferrer.rb', line 59

def infer_from_attributes(_gateway, schema, attributes:, **rest)
  indexes = schema.indexes | indexes_from_attributes(attributes)
  foreign_keys = foreign_keys_from_attributes(attributes)

  { **rest,
    attributes: attributes.map { |attr| mark_indexed(attr, indexes) },
    foreign_keys: foreign_keys,
    indexes: indexes }
end

#infer_from_database(gateway, schema, attributes:, **rest) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.


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# File 'lib/rom/sql/schema/inferrer.rb', line 47

def infer_from_database(gateway, schema, attributes:, **rest)
  idx = attributes_index(attributes)
  indexes = indexes_from_database(gateway, schema, idx)
  foreign_keys = foreign_keys_from_database(gateway, schema, idx)

  { **rest,
    attributes: attributes.map { |attr| mark_fk(mark_indexed(attr, indexes), foreign_keys) },
    foreign_keys: foreign_keys,
    indexes: indexes }
end

#suppress_errorsObject

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.


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# File 'lib/rom/sql/schema/inferrer.rb', line 114

def suppress_errors
  with(raise_on_error: false, silent: true)
end