Module: Koala::Facebook::GraphAPIMethods

Included in:
API
Defined in:
lib/koala/api/graph_api.rb

Overview

Methods used to interact with the Facebook Graph API.

See github.com/arsduo/koala/wiki/Graph-API for a general introduction to Koala and the Graph API.

The Graph API is made up of the objects in Facebook (e.g., people, pages, events, photos, etc.) and the connections between them (e.g., friends, photo tags, event RSVPs, etc.). Koala provides access to those objects types in a generic way. For example, given an OAuth access token, this will fetch the profile of the active user and the list of the user's friends:

You can see a list of all of the objects and connections supported by the API at developers.facebook.com/docs/reference/api/.

You can obtain an access token via OAuth or by using the Facebook JavaScript SDK. If you're using the JavaScript SDK, you can use the OAuth#get_user_from_cookie method to get the OAuth access token for the active user from the cookie provided by Facebook. See the Koala and Facebook documentation for more information.

Examples:

graph = Koala::Facebook::API.new(access_token)
user = graph.get_object("me")
friends = graph.get_connections(user["id"], "friends")

Instance Method Summary collapse

Instance Method Details

#batch(http_options = {}, &block) ⇒ Object

Execute a set of Graph API calls as a batch. See batch request documentation for more information and examples.

Examples:

results = @api.batch do |batch_api|
  batch_api.get_object('me')
  batch_api.get_object(KoalaTest.user1)
end
# => [{'id' => my_id, ...}, {'id' => koppel_id, ...}]

# You can also provide blocks to your operations to process the
# results, which is often useful if you're constructing batch
# requests in various locations and want to keep the code
# together in logical places.
# See readme.md and the wiki for more examples.
@api.batch do |batch_api|
  batch_api.get_object('me') {|data| data["id"] }
  batch_api.get_object(KoalaTest.user1) {|data| data["name"] }
end
# => [my_id, "Alex Koppel"]

Raises:

  • (Koala::Facebook::APIError)

    only if there is a problem with the overall batch request (e.g. connectivity failure, an operation with a missing dependency). Individual calls that error out will be represented as an unraised APIError in the appropriate spot in the results array.



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# File 'lib/koala/api/graph_api.rb', line 471

def batch(http_options = {}, &block)
  batch_client = GraphBatchAPI.new(access_token, self)
  if block
    yield batch_client
    batch_client.execute(http_options)
  else
    batch_client
  end
end

#debug_token(input_token, &block) ⇒ Object

Get an access token information The access token used to instantiate the API object needs to be the app access token or a valid User Access Token from a developer of the app. See developers.facebook.com/docs/howtos/login/debugging-access-tokens/#step1



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# File 'lib/koala/api/graph_api.rb', line 387

def debug_token(input_token, &block)
  access_token_info = graph_call("debug_token", {:input_token => input_token})

  block ? block.call(access_token_info) : access_token_info
end

#delete_connections(id, connection_name, args = {}, options = {}, &block) ⇒ Object

Note:

to access connections like /user_id/CONNECTION/other_user_id, simply pass “CONNECTION/other_user_id” as the connection_name

Delete an object's connection (for instance, unliking the object).



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# File 'lib/koala/api/graph_api.rb', line 161

def delete_connections(id, connection_name, args = {}, options = {}, &block)
  # Deletes a given connection
  raise AuthenticationError.new(nil, nil, "Delete requires an access token") unless @access_token
  graph_call("#{id}/#{connection_name}", args, "delete", options, &block)
end

#delete_like(id, options = {}, &block) ⇒ Object

Unlike a given object. Convenience method equivalent to delete_connection(id, “likes”).



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# File 'lib/koala/api/graph_api.rb', line 297

def delete_like(id, options = {}, &block)
  # Unlikes a given object for the logged-in user
  raise AuthenticationError.new(nil, nil, "Unliking requires an access token") unless @access_token
  graph_call("#{id}/likes", {}, "delete", options, &block)
end

#delete_object(id, options = {}, &block) ⇒ Object

Delete an object from the Graph if you have appropriate permissions.



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# File 'lib/koala/api/graph_api.rb', line 93

def delete_object(id, options = {}, &block)
  # Deletes the object with the given ID from the graph.
  raise AuthenticationError.new(nil, nil, "Delete requires an access token") unless @access_token
  graph_call(id, {}, "delete", options, &block)
end

#fql_multiquery(queries = {}, args = {}, options = {}, &block) ⇒ Object

Make an FQL multiquery. This method simplifies the result returned from multiquery into a more logical format.

Examples:

@api.fql_multiquery({
  "query1" => "select post_id from stream where source_id = me()",
  "query2" => "select fromid from comment where post_id in (select post_id from #query1)"
})
# returns {"query1" => [obj1, obj2, ...], "query2" => [obj3, ...]}
# instead of [{"name":"query1", "fql_result_set":[]},{"name":"query2", "fql_result_set":[]}]


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# File 'lib/koala/api/graph_api.rb', line 352

def fql_multiquery(queries = {}, args = {}, options = {}, &block)
  resolved_results = if results = get_object("fql", args.merge(:q => MultiJson.dump(queries)), options)
    # simplify the multiquery result format
    results.inject({}) {|outcome, data| outcome[data["name"]] = data["fql_result_set"]; outcome}
  end

  block ? block.call(resolved_results) : resolved_results
end

#fql_query(query, args = {}, options = {}, &block) ⇒ Object

Make an FQL query. Convenience method equivalent to get_object(“fql”, :q => query).



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# File 'lib/koala/api/graph_api.rb', line 331

def fql_query(query, args = {}, options = {}, &block)
  get_object("fql", args.merge(:q => query), options, &block)
end

#get_comments_for_urls(urls = [], args = {}, options = {}, &block) ⇒ Object

Fetches the comments from fb:comments widgets for a given set of URLs (array or comma-separated string). See developers.facebook.com/blog/post/490.



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# File 'lib/koala/api/graph_api.rb', line 402

def get_comments_for_urls(urls = [], args = {}, options = {}, &block)
  return [] if urls.empty?
  args.merge!(:ids => urls.respond_to?(:join) ? urls.join(",") : urls)
  get_object("comments", args, options, &block)
end

#get_connection(id, connection_name, args = {}, options = {}, &block) ⇒ Koala::Facebook::API::GraphCollection Also known as: get_connections

Note:

to access connections like /user_id/CONNECTION/other_user_id, simply pass “CONNECTION/other_user_id” as the connection_name

Fetch information about a given connection (e.g. type of activity – feed, events, photos, etc.) for a specific user. See Facebook's documentation for a complete list of connections.



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# File 'lib/koala/api/graph_api.rb', line 113

def get_connection(id, connection_name, args = {}, options = {}, &block)
  # Fetches the connections for given object.
  graph_call("#{id}/#{connection_name}", args, "get", options, &block)
end

#get_object(id, args = {}, options = {}, &block) ⇒ Object

Get information about a Facebook object.

Examples:

get_object("me")  # => {"id" => ..., "name" => ...}
get_object("me") {|data| data['education']}  # => only education section of profile

Raises:



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# File 'lib/koala/api/graph_api.rb', line 54

def get_object(id, args = {}, options = {}, &block)
  # Fetches the given object from the graph.
  graph_call(id, args, "get", options, &block)
end

#get_objects(ids, args = {}, options = {}, &block) ⇒ Object

Get information about multiple Facebook objects in one call.

Raises:



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# File 'lib/koala/api/graph_api.rb', line 69

def get_objects(ids, args = {}, options = {}, &block)
  # Fetches all of the given objects from the graph.
  # If any of the IDs are invalid, they'll raise an exception.
  return [] if ids.empty?
  graph_call("", args.merge("ids" => ids.respond_to?(:join) ? ids.join(",") : ids), "get", options, &block)
end

#get_page(params, &block) ⇒ Object

Note:

You'll rarely need to use this method unless you're using Sinatra or another non-Rails framework (see GraphCollection for more information).

Certain calls such as #get_connections return an array of results which you can page through forwards and backwards (to see more feed stories, search results, etc.). Those methods use get_page to request another set of results from Facebook.



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# File 'lib/koala/api/graph_api.rb', line 433

def get_page(params, &block)
  graph_call(*params, &block)
end

#get_page_access_token(id, args = {}, options = {}, &block) ⇒ Object

Get a page's access token, allowing you to act as the page. Convenience method for @api.get_object(page_id, :fields => “access_token”).



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# File 'lib/koala/api/graph_api.rb', line 370

def get_page_access_token(id, args = {}, options = {}, &block)
  access_token = get_object(id, args.merge(:fields => "access_token"), options) do |result|
    result ? result["access_token"] : nil
  end

  block ? block.call(access_token) : access_token
end

#get_picture(object, args = {}, options = {}, &block) ⇒ Object

Note:

to delete photos or videos, use delete_object(id)

Fetches a photo. (Facebook returns the src of the photo as a response header; this method parses that properly, unlike using get_connections(“photo”).)



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# File 'lib/koala/api/graph_api.rb', line 178

def get_picture(object, args = {}, options = {}, &block)
  # Gets a picture object, returning the URL (which Facebook sends as a header)
  resolved_result = graph_call("#{object}/picture", args, "get", options.merge(:http_component => :headers)) do |result|
    result ? result["Location"] : nil
  end
  block ? block.call(resolved_result) : resolved_result
end

#graph_call(path, args = {}, verb = "get", options = {}) { ... } ⇒ Object

Make a call directly to the Graph API. (See any of the other methods for example invocations.)

Yields:

  • response when making a batch API call, you can pass in a block that parses the results, allowing for cleaner code. The block's return value is returned in the batch results. See the code for #get_picture or #fql_multiquery for examples. (Not needed in regular calls; you'll probably rarely use this.)

Raises:



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# File 'lib/koala/api/graph_api.rb', line 498

def graph_call(path, args = {}, verb = "get", options = {}, &post_processing)
  # enable appsecret_proof by default
  options = {:appsecret_proof => true}.merge(options) if @app_secret
  result = api(path, args, verb, options) do |response|
    error = check_response(response.status, response.body)
    raise error if error
  end

  # turn this into a GraphCollection if it's pageable
  result = GraphCollection.evaluate(result, self)

  # now process as appropriate for the given call (get picture header, etc.)
  post_processing ? post_processing.call(result) : result
end

#put_comment(id, message, options = {}, &block) ⇒ Object

Comment on a given object. Convenience method equivalent to put_connection(id, “comments”).

To delete comments, use delete_object(comment_id). To get comments, use get_connections(object, “likes”).



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# File 'lib/koala/api/graph_api.rb', line 269

def put_comment(id, message, options = {}, &block)
  # Writes the given comment on the given post.
  put_connections(id, "comments", {:message => message}, options, &block)
end

#put_connections(id, connection_name, args = {}, options = {}, &block) ⇒ Object

Note:

to access connections like /user_id/CONNECTION/other_user_id, simply pass “CONNECTION/other_user_id” as the connection_name

Write an object to the Graph for a specific user. See Facebook's documentation for all the supported writeable objects. It is important to note that objects take the singular form, i.e. “event” when using put_connections.

Most write operations require extended permissions. For example, publishing wall posts requires the “publish_stream” permission. See developers.facebook.com/docs/authentication/ for details about extended permissions.

Examples:

graph.put_connections("me", "feed", :message => "Hello, world")
=> writes "Hello, world" to the active user's wall

Raises:



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# File 'lib/koala/api/graph_api.rb', line 143

def put_connections(id, connection_name, args = {}, options = {}, &block)
  # Posts a certain connection
  raise AuthenticationError.new(nil, nil, "Write operations require an access token") unless @access_token

  graph_call("#{id}/#{connection_name}", args, "post", options, &block)
end

#put_like(id, options = {}, &block) ⇒ Object

Like a given object. Convenience method equivalent to put_connections(id, “likes”).

To get a list of a user's or object's likes, use get_connections(id, “likes”).



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# File 'lib/koala/api/graph_api.rb', line 284

def put_like(id, options = {}, &block)
  # Likes the given post.
  put_connections(id, "likes", {}, options, &block)
end

#put_object(parent_object, connection_name, args = {}, options = {}, &block) ⇒ Object

Note:

put_object is (for historical reasons) the same as put_connections. Please use put_connections; in a future version of Koala (2.0?), put_object will issue a POST directly to an individual object, not to a connection.

Write an object to the Graph for a specific user.

See Also:



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# File 'lib/koala/api/graph_api.rb', line 82

def put_object(parent_object, connection_name, args = {}, options = {}, &block)
  put_connections(parent_object, connection_name, args, options, &block)
end

#put_picture(*picture_args, &block) ⇒ Object

Note:

to access the media after upload, you'll need the user_photos or user_videos permission as appropriate.

Upload a photo.

This can be called in multiple ways:

put_picture(file, [content_type], ...)
put_picture(path_to_file, [content_type], ...)
put_picture(picture_url, ...)

You can also pass in uploaded files directly from Rails or Sinatra. See the Koala wiki for more information.

Examples:

put_picture(file, content_type, {:message => "Message"}, 01234560)
put_picture(params[:file], {:message => "Message"})
# with URLs, there's no optional content type field
put_picture(picture_url, {:message => "Message"}, my_page_id)


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# File 'lib/koala/api/graph_api.rb', line 210

def put_picture(*picture_args, &block)
  put_connections(*parse_media_args(picture_args, "photos"), &block)
end

#put_video(*video_args, &block) ⇒ Object

Upload a video. Functions exactly the same as put_picture.

See Also:



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# File 'lib/koala/api/graph_api.rb', line 216

def put_video(*video_args, &block)
  args = parse_media_args(video_args, "videos")
  args.last[:video] = true
  put_connections(*args, &block)
end

#put_wall_post(message, attachment = {}, target_id = "me", options = {}, &block) ⇒ Object

Write directly to the user's wall. Convenience method equivalent to put_connections(id, “feed”).

To get wall posts, use get_connections(user, “feed”) To delete a wall post, use delete_object(post_id)

Examples:

@api.put_wall_post("Hello there!", {
  "name" => "Link name",
  "link" => "http://www.example.com/",
  "caption" => "{*actor*} posted a new review",
  "description" => "This is a longer description of the attachment",
  "picture" => "http://www.example.com/thumbnail.jpg"
})

See Also:



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# File 'lib/koala/api/graph_api.rb', line 249

def put_wall_post(message, attachment = {}, target_id = "me", options = {}, &block)
  if properties = attachment.delete(:properties) || attachment.delete("properties")
    properties = MultiJson.dump(properties) if properties.is_a?(Hash) || properties.is_a?(Array)
    attachment["properties"] = properties
  end
  put_connections(target_id, "feed", attachment.merge({:message => message}), options, &block)
end

#search(search_terms, args = {}, options = {}, &block) ⇒ Koala::Facebook::API::GraphCollection

Search for a given query among visible Facebook objects. See Facebook documentation for more information.



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# File 'lib/koala/api/graph_api.rb', line 312

def search(search_terms, args = {}, options = {}, &block)
  args.merge!({:q => search_terms}) unless search_terms.nil?
  graph_call("search", args, "get", options, &block)
end

#set_app_restrictions(app_id, restrictions_hash, args = {}, options = {}, &block) ⇒ Object

App restrictions require you to JSON-encode the restriction value. This is neither obvious nor intuitive, so this convenience method is provided.



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# File 'lib/koala/api/graph_api.rb', line 417

def set_app_restrictions(app_id, restrictions_hash, args = {}, options = {}, &block)
  graph_call(app_id, args.merge(:restrictions => MultiJson.dump(restrictions_hash)), "post", options, &block)
end