Class: Rasti::DB::Relations::ManyToMany
- Inherits:
-
Base
- Object
- Base
- Rasti::DB::Relations::ManyToMany
show all
- Defined in:
- lib/rasti/db/relations/many_to_many.rb
Instance Attribute Summary
Attributes inherited from Base
#name, #source_collection_class
Instance Method Summary
collapse
Methods inherited from Base
#from_many?, #from_one?, #initialize, #join_relation_name, #many_to_many?, #many_to_one?, #one_to_many?, #one_to_one?, #target_collection_class, #to_many?, #to_one?
Instance Method Details
#add_join(environment, dataset, prefix = nil) ⇒ Object
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# File 'lib/rasti/db/relations/many_to_many.rb', line 67
def add_join(environment, dataset, prefix=nil)
validate_join!
many_to_many_relation_alias = with_prefix prefix, "#{relation_collection_name}_#{SecureRandom.base64}"
relation_name = prefix ? Sequel[prefix] : Sequel[source_collection_class.collection_name]
many_to_many_condition = {
Sequel[many_to_many_relation_alias][source_foreign_key] => relation_name[source_collection_class.primary_key]
}
relation_alias = join_relation_name prefix
relation_condition = {
Sequel[relation_alias][target_collection_class.primary_key] => Sequel[many_to_many_relation_alias][target_foreign_key]
}
dataset.join(qualified_relation_collection_name(environment).as(many_to_many_relation_alias), many_to_many_condition)
.join(environment.qualify_collection(target_collection_class).as(relation_alias), relation_condition)
end
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#apply_filter(environment, dataset, primary_keys) ⇒ Object
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# File 'lib/rasti/db/relations/many_to_many.rb', line 88
def apply_filter(environment, dataset, primary_keys)
if source_collection_class.data_source_name == relation_data_source_name
dataset.join(qualified_relation_collection_name(environment), source_foreign_key => source_collection_class.primary_key)
.where(Sequel[relation_collection_name][target_foreign_key] => primary_keys)
.select_all(source_collection_class.collection_name)
.distinct
else
data_source = environment.data_source relation_data_source_name
fks = data_source.db.from(data_source.qualify(relation_collection_name))
.where(target_collection_class.foreign_key => primary_keys)
.select_map(source_collection_class.foreign_key)
.uniq
dataset.where(source_collection_class.primary_key => fks)
end
end
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#fetch_graph(environment, rows, selected_attributes = nil, excluded_attributes = nil, relations_graph = nil) ⇒ Object
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# File 'lib/rasti/db/relations/many_to_many.rb', line 22
def fetch_graph(environment, rows, selected_attributes=nil, excluded_attributes=nil, relations_graph=nil)
pks = rows.map { |row| row[source_collection_class.primary_key] }
if target_collection_class.data_source_name == relation_data_source_name
target_data_source = environment.data_source_of target_collection_class
dataset = target_data_source.db.from(environment.qualify_collection(target_collection_class))
.join(qualified_relation_collection_name(environment), target_foreign_key => target_collection_class.primary_key)
.where(Sequel[relation_collection_name][source_foreign_key] => pks)
.select_all(target_collection_class.collection_name)
selected_attributes ||= target_collection_class.collection_attributes - excluded_attributes if excluded_attributes
dataset = dataset.select(*selected_attributes.map { |a| Sequel[target_collection_class.collection_name][a] }) if selected_attributes
join_rows = dataset.select_append(Sequel[relation_collection_name][source_foreign_key].as(:source_foreign_key)).all
else
relation_data_source = environment.data_source relation_data_source_name
relation_index = relation_data_source.db.from(relation_data_source.qualify(relation_collection_name))
.where(source_foreign_key => pks)
.select_hash_groups(target_foreign_key, source_foreign_key)
query = target_collection_class.new environment
query = query.exclude_attributes(*excluded_attributes) if excluded_attributes
query = query.select_attributes(*selected_attributes) if selected_attributes
join_rows = query.where(target_collection_class.primary_key => relation_index.keys).raw.flat_map do |row|
relation_index[row[target_collection_class.primary_key]].map do |source_primary_key|
row.merge(source_foreign_key: source_primary_key)
end
end
end
relations_graph.fetch_graph join_rows if relations_graph
relation_rows = join_rows.each_with_object(Hash.new { |h,k| h[k] = [] }) do |row, hash|
attributes = row.select { |attr,_| target_collection_class.model.attribute_names.include? attr }
hash[row[:source_foreign_key]] << target_collection_class.model.new(attributes)
end
rows.each do |row|
row[name] = relation_rows.fetch row[source_collection_class.primary_key], []
end
end
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#relation_collection_name ⇒ Object
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# File 'lib/rasti/db/relations/many_to_many.rb', line 14
def relation_collection_name
@relation_collection_name ||= options[:relation_collection_name] || [source_collection_class.collection_name, target_collection_class.collection_name].sort.join('_').to_sym
end
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#relation_data_source_name ⇒ Object
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# File 'lib/rasti/db/relations/many_to_many.rb', line 18
def relation_data_source_name
@relation_data_source_name ||= options[:relation_data_source_name] || source_collection_class.data_source_name
end
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#source_foreign_key ⇒ Object
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# File 'lib/rasti/db/relations/many_to_many.rb', line 6
def source_foreign_key
@source_foreign_key ||= options[:source_foreign_key] || source_collection_class.foreign_key
end
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#target_foreign_key ⇒ Object
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# File 'lib/rasti/db/relations/many_to_many.rb', line 10
def target_foreign_key
@target_foreign_key ||= options[:target_foreign_key] || target_collection_class.foreign_key
end
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