Class: GraphQL::Pagination::Connections

Inherits:
Object
  • Object
show all
Defined in:
lib/graphql/pagination/connections.rb

Overview

A schema-level connection wrapper manager.

Attach as a plugin.

Examples:

Using new default connections

class MySchema < GraphQL::Schema
  use GraphQL::Pagination::Connections
end

Adding a custom wrapper

class MySchema < GraphQL::Schema
  use GraphQL::Pagination::Connections
  connections.add(MyApp::SearchResults, MyApp::SearchResultsConnection)
end

Removing default connection support for arrays (they can still be manually wrapped)

class MySchema < GraphQL::Schema
  use GraphQL::Pagination::Connections
  connections.delete(Array)
end

See Also:

  • {Schema{Schema.connections}

Defined Under Namespace

Classes: ImplementationMissingError

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(schema:) ⇒ Connections

Returns a new instance of Connections.



42
43
44
45
46
# File 'lib/graphql/pagination/connections.rb', line 42

def initialize(schema:)
  @schema = schema
  @wrappers = {}
  add_default
end

Class Method Details

.use(schema_defn) ⇒ Object



31
32
33
34
35
36
37
38
39
40
# File 'lib/graphql/pagination/connections.rb', line 31

def self.use(schema_defn)
  if schema_defn.is_a?(Class)
    schema_defn.connections = self.new(schema: schema_defn)
  else
    # Unwrap a `.define` object
    schema_defn = schema_defn.target
    schema_defn.connections = self.new(schema: schema_defn)
    schema_defn.class.connections = schema_defn.connections
  end
end

Instance Method Details

#add(nodes_class, implementation) ⇒ Object



48
49
50
# File 'lib/graphql/pagination/connections.rb', line 48

def add(nodes_class, implementation)
  @wrappers[nodes_class] = implementation
end

#all_wrappersObject



56
57
58
59
60
61
62
63
64
# File 'lib/graphql/pagination/connections.rb', line 56

def all_wrappers
  all_wrappers = {}
  @schema.ancestors.reverse_each do |schema_class|
    if schema_class.respond_to?(:connections) && (c = schema_class.connections)
      all_wrappers.merge!(c.wrappers)
    end
  end
  all_wrappers
end

#delete(nodes_class) ⇒ Object



52
53
54
# File 'lib/graphql/pagination/connections.rb', line 52

def delete(nodes_class)
  @wrappers.delete(nodes_class)
end

#wrap(field, object, arguments, context, wrappers: all_wrappers) ⇒ Object

Used by the runtime to wrap values in connection wrappers.



68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
# File 'lib/graphql/pagination/connections.rb', line 68

def wrap(field, object, arguments, context, wrappers: all_wrappers)
  impl = nil

  object.class.ancestors.each { |cls|
    impl = wrappers[cls]
    break if impl
  }

  if impl.nil?
    raise ImplementationMissingError, "Couldn't find a connection wrapper for #{object.class} during #{field.path} (#{object.inspect})"
  end

  impl.new(
    object,
    context: context,
    max_page_size: field.max_page_size || context.schema.default_max_page_size,
    first: arguments[:first],
    after: arguments[:after],
    last: arguments[:last],
    before: arguments[:before],
  )
end