Tagged Questions

DataMapper is a Object Relational Mapper written in Ruby. It implements an architectural pattern with the same name (with some changes).

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Datamapper with ParanoidBoolean is breaking navigation

Here I put an example to illustrate the problem. Try running it as is -> will not work, and then try commenting out the property :deleted, ParanoidBoolean http://pastebin.com/iWamnVj5 When the ...
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25 views

Creating entries in table from another table

Here are some tables in my database. (A template has some number of tasks associated with it): Templates ========= id template_name ----------------- 1 Template 1 2 Template 2 Tasks ===== id ...
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1answer
40 views

Ruby Datamapper will not insert serial data

I have created a Ruby script that gets serial data and if it starts with certain characters, prints string (SMS), inserts string into a file, parses string, then inserts parsed data into a MySql ...
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1answer
12 views

LoadError on Windows when trying to generate a model

When trying to generate a model in a new Padrino project, I get the following: C:\temp\ruby\test>padrino g model client ...
0
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1answer
29 views

DataMapper `has n` for different types of a model

I would like to have a model with different types of has n, for example: class Blog include DataMapper::Resource property :id, Serial has 1, :owner # of type user... has n, :authors # of ...
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76 views

Ruby DataMapper complex parent-child relationship

I'm designing an API and database for somebody's app. I have some models in DataMapper, like User, Job, etc. I'm trying to structure relationships such that a Job can have 1 owner (User), 1 worker ...
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25 views

Modelling comments in a database

I'm planning on modelling Users which can add Comments about other data models. User has many Comments Comment has a single author (User) I'd like to allow commenting on virtually any data model I ...
0
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1answer
31 views

ruby datamapper - symmetric self-referential many-to-many relationship

I'm not an expert in databases and relational logic and I'm a bit confused about what I have to do in the following situation. I have a model Expression where I want to implement a TranslationPair ...
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8 views

DataMapper Inheritance with Validation

I have the following defined: class Event include DataMapper::Resource property :id, Serial # For managing single table inheritance property :type, Discriminator end class DurationEvent ...
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30 views

How do I reprogram Rails' polymorphic_url and url_for helpers for namespaced models?

I have extant DataMapper models. I'm using them in a Rails app. They're named something like Org::Model::Foo. I've already set up a ...
0
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1answer
78 views

Accessing the resource inside load/dump

consider the following example module DataMapper class Property class CustomType < DataMapper::Property::Text def load(value) # do stuff and return formatted value end ...
1
vote
1answer
39 views

ruby datamapper how to include child associations from has n association in query

Suppose I have an Article with n Comments. How would I go about grabbing all the comments with the article in one query with DataMapper? Something like the following false code: ...
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0answers
22 views

ruby datamapper breakdown of Serial vs String property for key

Should every table have a Serial id? When would you need one, when wouldnt you? (associations, performance, etc?) YouTube identifies videos with a key like "ttpYdIodMWc". I want something similar, ...
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vote
1answer
79 views

One-to-one DataMapper association

I'm very new to DataMapper, and I'm trying to create models for the following scenario: I've got a number of users (with a user name, password etc.), who can also be players or referees or both (so ...
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0answers
14 views

Datamapper - save new record into external database

I use DataMapper to connect to multiple databases. Reads and updates work, but when I try to create new record in my external database, it tries to save the record into the default database. Here is ...

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