Class: Jbuilder
- Inherits:
-
Object
- Object
- Jbuilder
- Defined in:
- lib/jbuilder.rb,
lib/jbuilder/blank.rb,
lib/jbuilder/errors.rb,
lib/jbuilder/railtie.rb,
lib/jbuilder/key_formatter.rb,
lib/jbuilder/dependency_tracker.rb
Direct Known Subclasses
Defined Under Namespace
Modules: DependencyTrackerMethods Classes: ArrayError, Blank, KeyFormatter, MergeError, NullError, Railtie
Constant Summary collapse
- BLANK =
Blank.new
- NON_ENUMERABLES =
[ ::Struct, ::OpenStruct ].to_set
- DependencyTracker =
Class.new(dependency_tracker::ERBTracker)
- @@key_formatter =
nil
- @@ignore_nil =
false
Class Method Summary collapse
-
.encode(*args, &block) ⇒ Object
Yields a builder and automatically turns the result into a JSON string.
-
.ignore_nil(value = true) ⇒ Object
Same as instance method ignore_nil! except sets the default.
-
.key_format(*args) ⇒ Object
Same as the instance method key_format! except sets the default.
Instance Method Summary collapse
-
#array!(collection = [], *attributes, &block) ⇒ Object
Turns the current element into an array and iterates over the passed collection, adding each iteration as an element of the resulting array.
-
#attributes! ⇒ Object
Returns the attributes of the current builder.
- #call(object, *attributes, &block) ⇒ Object
-
#child! ⇒ Object
Turns the current element into an array and yields a builder to add a hash.
-
#extract!(object, *attributes) ⇒ Object
Extracts the mentioned attributes or hash elements from the passed object and turns them into attributes of the JSON.
-
#ignore_nil!(value = true) ⇒ Object
If you want to skip adding nil values to your JSON hash.
-
#initialize(options = {}) {|_self| ... } ⇒ Jbuilder
constructor
A new instance of Jbuilder.
-
#key_format!(*args) ⇒ Object
Specifies formatting to be applied to the key.
-
#merge!(hash_or_array) ⇒ Object
Merges hash or array into current builder.
- #method_missing(*args, &block) ⇒ Object
-
#nil! ⇒ Object
(also: #null!)
Returns the nil JSON.
- #set!(key, value = BLANK, *args, &block) ⇒ Object
-
#target! ⇒ Object
Encodes the current builder as JSON.
Constructor Details
#initialize(options = {}) {|_self| ... } ⇒ Jbuilder
Returns a new instance of Jbuilder.
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# File 'lib/jbuilder.rb', line 13 def initialize( = {}) @attributes = {} @key_formatter = .fetch(:key_formatter){ @@key_formatter ? @@key_formatter.clone : nil} @ignore_nil = .fetch(:ignore_nil, @@ignore_nil) yield self if ::Kernel.block_given? end |
Dynamic Method Handling
This class handles dynamic methods through the method_missing method
#method_missing(*args, &block) ⇒ Object
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# File 'lib/jbuilder.rb', line 65 def method_missing(*args, &block) if ::Kernel.block_given? set!(*args, &block) else set!(*args) end end |
Class Method Details
.encode(*args, &block) ⇒ Object
Yields a builder and automatically turns the result into a JSON string
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# File 'lib/jbuilder.rb', line 23 def self.encode(*args, &block) new(*args, &block).target! end |
.ignore_nil(value = true) ⇒ Object
Same as instance method ignore_nil! except sets the default.
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# File 'lib/jbuilder.rb', line 130 def self.ignore_nil(value = true) @@ignore_nil = value end |
.key_format(*args) ⇒ Object
Same as the instance method key_format! except sets the default.
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# File 'lib/jbuilder.rb', line 106 def self.key_format(*args) @@key_formatter = KeyFormatter.new(*args) end |
Instance Method Details
#array!(collection = [], *attributes, &block) ⇒ Object
Turns the current element into an array and iterates over the passed collection, adding each iteration as an element of the resulting array.
Example:
json.array!(@people) do |person|
json.name person.name
json.age calculate_age(person.birthday)
end
[ { "name": David", "age": 32 }, { "name": Jamie", "age": 31 } ]
You can use the call syntax instead of an explicit extract! call:
json.(@people) { |person| ... }
It’s generally only needed to use this method for top-level arrays. If you have named arrays, you can do:
json.people(@people) do |person|
json.name person.name
json.age calculate_age(person.birthday)
end
{ "people": [ { "name": David", "age": 32 }, { "name": Jamie", "age": 31 } ] }
If you omit the block then you can set the top level array directly:
json.array! [1, 2, 3]
[1,2,3]
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# File 'lib/jbuilder.rb', line 185 def array!(collection = [], *attributes, &block) array = if collection.nil? [] elsif ::Kernel.block_given? _map_collection(collection, &block) elsif attributes.any? _map_collection(collection) { |element| extract! element, *attributes } else collection.to_a end merge! array end |
#attributes! ⇒ Object
Returns the attributes of the current builder.
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# File 'lib/jbuilder.rb', line 240 def attributes! @attributes end |
#call(object, *attributes, &block) ⇒ Object
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# File 'lib/jbuilder.rb', line 224 def call(object, *attributes, &block) if ::Kernel.block_given? array! object, &block else extract! object, *attributes end end |
#child! ⇒ Object
Turns the current element into an array and yields a builder to add a hash.
Example:
json.comments do
json.child! { json.content "hello" }
json.child! { json.content "world" }
end
{ "comments": [ { "content": "hello" }, { "content": "world" } ]}
More commonly, you’d use the combined iterator, though:
json.comments(@post.comments) do |comment|
json.content comment.formatted_content
end
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# File 'lib/jbuilder.rb', line 150 def child! @attributes = [] unless ::Array === @attributes @attributes << _scope{ yield self } end |
#extract!(object, *attributes) ⇒ Object
Extracts the mentioned attributes or hash elements from the passed object and turns them into attributes of the JSON.
Example:
@person = Struct.new(:name, :age).new('David', 32)
or you can utilize a Hash
@person = { name: 'David', age: 32 }
json.extract! @person, :name, :age
{ "name": David", "age": 32 }, { "name": Jamie", "age": 31 }
You can also use the call syntax instead of an explicit extract! call:
json.(@person, :name, :age)
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# File 'lib/jbuilder.rb', line 216 def extract!(object, *attributes) if ::Hash === object _extract_hash_values(object, attributes) else _extract_method_values(object, attributes) end end |
#ignore_nil!(value = true) ⇒ Object
If you want to skip adding nil values to your JSON hash. This is useful for JSON clients that don’t deal well with nil values, and would prefer not to receive keys which have null values.
Example:
json.ignore_nil! false
json.id User.new.id
{ "id": null }
json.ignore_nil!
json.id User.new.id
{}
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# File 'lib/jbuilder.rb', line 125 def ignore_nil!(value = true) @ignore_nil = value end |
#key_format!(*args) ⇒ Object
Specifies formatting to be applied to the key. Passing in a name of a function will cause that function to be called on the key. So :upcase will upper case the key. You can also pass in lambdas for more complex transformations.
Example:
json.key_format! :upcase
json. do
json.name "David"
json.age 32
end
{ "AUTHOR": { "NAME": "David", "AGE": 32 } }
You can pass parameters to the method using a hash pair.
json.key_format! camelize: :lower
json.first_name "David"
{ "firstName": "David" }
Lambdas can also be used.
json.key_format! ->(key){ "_" + key }
json.first_name "David"
{ "_first_name": "David" }
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# File 'lib/jbuilder.rb', line 101 def key_format!(*args) @key_formatter = KeyFormatter.new(*args) end |
#merge!(hash_or_array) ⇒ Object
Merges hash or array into current builder.
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# File 'lib/jbuilder.rb', line 245 def merge!(hash_or_array) @attributes = _merge_values(@attributes, hash_or_array) end |
#nil! ⇒ Object Also known as: null!
Returns the nil JSON.
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# File 'lib/jbuilder.rb', line 233 def nil! @attributes = nil end |
#set!(key, value = BLANK, *args, &block) ⇒ Object
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# File 'lib/jbuilder.rb', line 30 def set!(key, value = BLANK, *args, &block) result = if ::Kernel.block_given? if !_blank?(value) # json.comments @post.comments { |comment| ... } # { "comments": [ { ... }, { ... } ] } _scope{ array! value, &block } else # json.comments { ... } # { "comments": ... } _merge_block(key){ yield self } end elsif args.empty? if ::Jbuilder === value # json.age 32 # json.person another_jbuilder # { "age": 32, "person": { ... } value.attributes! else # json.age 32 # { "age": 32 } value end elsif _is_collection?(value) # json.comments @post.comments, :content, :created_at # { "comments": [ { "content": "hello", "created_at": "..." }, { "content": "world", "created_at": "..." } ] } _scope{ array! value, *args } else # json.author @post.creator, :name, :email_address # { "author": { "name": "David", "email_address": "[email protected]" } } _merge_block(key){ extract! value, *args } end _set_value key, result end |
#target! ⇒ Object
Encodes the current builder as JSON.
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# File 'lib/jbuilder.rb', line 250 def target! @attributes.to_json end |