datamapper

问题 I've got a database view that I need to send to a Web API call in JSON format, but I'm having a hard time figuring out how to get the datamapper to un-flatten the data. The format I want to get to is something like: { "PersonId": "12345" , "CommonProp": "asdf" , "DataForPerson": [ { "Prop1": "prop 1 value A", "Prop2": "prop 2 value A" } , { "Prop1": "prop 1 value B", "Prop2": "prop 2 value B" } ] } The format coming in from the view is something like: PersonId CommonProp Prop1 Prop2 12345

问题 I have this to select columns from a table and I want to pass this to Jquery ajax fn. I am using below code but getting invalid json My table has three column id, name and city but I am not selecting city This is my json reponse ["{id:1,name\":\"JOHN\",\"city\":\"null\"}" ,"{\"id\":2,\"name\":\"MICHEAL\,\"city\":\"null\"}"] 回答1: Sadly the current stable (1.8.1) WanWizard datamapper DMZ_Json class double encode fields when you call all_to_json() . This issue seem to be fixed in the develop

问题 I'm using the data mapper pattern in Java for accessing the database. Is it OK to call a mapper inside of another mapper? As far as I'm concerned, mappers should work on their own without a dependency on other mappers, but it seems that someone else who works on the same project with me has a different opinion. To give an example: I have a Customer object and a ContactPerson object. The Customer has a ContactPerson object in it as a field. For getting data from a database, I have both a

问题 I am having trouble understanding the datamapper design pattern. I have two queries (one to get albums and one to get artist). I want to produce a list of albums and artists (band members). There is a one to many relationship between the two. SQL Queries public function getArtist() { $adapter = $this->getAdapter(); $sql = new Sql($adapter); $select = $sql->select(); $select->from('genre'); $select->where(array( 'album_id' => $album,)); $selectString = $sql->getSqlStringForSqlObject($select);

问题 I'm creating a very simple timeshare application using Sinatra and Datamapper. Every user in the application will have n reservations and for the time being each reservation runs from Monday to Sunday and there can only be one reservation per week. Now I will need a view with a textbox (and label) for each week of the year where the users will put their name (through autocompletion or something) and thereby creating a reservation for that week. And if the week is reserved the name will of

问题 I have this many-many DataMapper/MySQL setup with Torrent and Tag, as follows: class Torrent include DataMapper::Resource property :id, Serial property :name, String property :magnet, Text property :created_at, DateTime has n, :tags, :through => Resource end class Tag include DataMapper::Resource property :id, Serial property :name, String property :hits, Integer has n, :torrents, :through => Resource end When trying to destroy a torrent, however, via Torrent.first.destroy or something

问题 From my Rails 3 app i want a JSON like this: {count:10, pictures:[ {id:1}, ... ] } I tried render( :json => { :count => 10, :pictures => @pictures.to_json(:only=>:id) } ) but in this case, my pictures get escaped ..."pictures":"[{\"id\":2653299}, .... In my old merb app I had the following simple line in my controller: display( { :count=>@count, :pictures => @pictures } ) Because I am using datamapper as my ORM and dm-serializer I am not sure where to influence the generated json. 回答1: Your

问题 I'm just diving into Datamapper (and Sinatra) and have a question about associations. Below are some models I have. This is what I want to implemented. I'm having an issue with Workoutitems and Workout. Workout will be managed separately, but Workoutitems has a single workout associated with each row. Workout - just a list of types of workouts (run, lift, situps, etc) Selected workout - this is the name of a set of workouts, along with notes by the user and trainer. It has a collection of N

问题 I'm just diving into Datamapper (and Sinatra) and have a question about associations. Below are some models I have. This is what I want to implemented. I'm having an issue with Workoutitems and Workout. Workout will be managed separately, but Workoutitems has a single workout associated with each row. Workout - just a list of types of workouts (run, lift, situps, etc) Selected workout - this is the name of a set of workouts, along with notes by the user and trainer. It has a collection of N

问题 Assume we have a Customer class which has a complex property called Address. Something like this: public class Customer { public string Name { get; set; } public Address { get; set; } } I need to implement Data Mapper pattern to persist Customer objects to the database. Should I have something like CustomerDataMapper that persists the Customer AND the Address or 2 different Data Mappers: CustomerDataMapper and AddressDataMapper? I'd like to know your thoughts on this. Cheers, Mosh 回答1: If you