Class: GraphQL::Schema::BuildFromDefinition::ResolveMap Private

Inherits:
Object
  • Object
show all
Defined in:
lib/graphql/schema/build_from_definition/resolve_map.rb,
lib/graphql/schema/build_from_definition/resolve_map/default_resolve.rb

Overview

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.

Wrap a user-provided hash of resolution behavior for easy access at runtime.

Coerce scalar values by:

  • Checking for a function in the map like { Date: { coerce_input: ->(val, ctx) { ... }, coerce_result: ->(val, ctx) { ... } } }
  • Falling back to a passthrough

Interface/union resolution can be provided as a resolve_type: key.

Defined Under Namespace

Modules: NullScalarCoerce Classes: DefaultResolve

Instance Method Summary collapse

Constructor Details

#initialize(user_resolve_hash) ⇒ ResolveMap

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.

Returns a new instance of ResolveMap.



23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
 
# File 'lib/graphql/schema/build_from_definition/resolve_map.rb', line 23

def initialize(user_resolve_hash)
  @resolve_hash = Hash.new do |h, k|
    # For each type name, provide a new hash if one wasn't given:
    h[k] = Hash.new do |h2, k2|
      if k2 == "coerce_input" || k2 == "coerce_result"
        # This isn't an object field, it's a scalar coerce function.
        # Use a passthrough
        NullScalarCoerce
      else
        # For each field, provide a resolver that will
        # make runtime checks & replace itself
        h2[k2] = DefaultResolve.new(h2, k2)
      end
    end
  end
  @user_resolve_hash = user_resolve_hash
  # User-provided resolve functions take priority over the default:
  @user_resolve_hash.each do |type_name, fields|
    type_name_s = type_name.to_s
    case fields
    when Hash
      fields.each do |field_name, resolve_fn|
        @resolve_hash[type_name_s][field_name.to_s] = resolve_fn
      end
    when Proc
      # for example, "resolve_type"
      @resolve_hash[type_name_s] = fields
    else
      raise ArgumentError, "Unexpected resolve hash value for #{type_name.inspect}: #{fields.inspect} (#{fields.class})"
    end
  end

  # Check the normalized hash, not the user input:
  if @resolve_hash.key?("resolve_type")
    define_singleton_method :resolve_type do |type, obj, ctx|
      @resolve_hash.fetch("resolve_type").call(type, obj, ctx)
    end
  end
end

Instance Method Details

#call(type, field, obj, args, ctx) ⇒ 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. 



63
64
65
66
 
# File 'lib/graphql/schema/build_from_definition/resolve_map.rb', line 63

def call(type, field, obj, args, ctx)
  resolver = @resolve_hash[type.graphql_name][field.graphql_name]
  resolver.call(obj, args, ctx)
end

#coerce_input(type, value, ctx) ⇒ 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. 



68
69
70
 
# File 'lib/graphql/schema/build_from_definition/resolve_map.rb', line 68

def coerce_input(type, value, ctx)
  @resolve_hash[type.graphql_name]["coerce_input"].call(value, ctx)
end

#coerce_result(type, value, ctx) ⇒ 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. 



72
73
74
 
# File 'lib/graphql/schema/build_from_definition/resolve_map.rb', line 72

def coerce_result(type, value, ctx)
  @resolve_hash[type.graphql_name]["coerce_result"].call(value, ctx)
end