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  • How to retrieve all the records from a Berkeley DB in Ruby

    - by Federico Builes
    I'd like to be able to get all the key-values stored in a Berkeley DB using the Ruby bindings from http://github.com/mattbauer/bdb/tree/master but I'm not sure how to proceed. Any pointers will be appreciated. UPDATE Here's a small script that loops over the keys and prints them. Based on Pax' answer: require 'rubygems' require 'bdb' env = Bdb::Env.new(0) env.open('foo', Bdb::DB_CREATE,0) db = env.db db.open(nil, 'db1.db', nil, Bdb::Db::BTREE, Bdb::DB_CREATE,0) db.put(nil, 'key', 'value', 0) db.put(nil, 'key1', 'value1', 0) db.put(nil, 'key2', 'value2', 0) dbc = db.cursor(nil,0) key,val = dbc.get(nil,nil,Bdb::DB_FIRST) while key p key,val key,val = dbc.get(nil,nil,Bdb::DB_NEXT) end dbc.close db.close(0) env.close

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  • WPF TypeConverter ConvertTo not firing

    - by JFoulkes
    Hi, I have a dependency property in a class which I need to be converted to a string. I have added the TypeConverty attribute on the property. The type I am converting is the .net Style class. [TypeConverter(typeof(BulletStyleTypeConverter))] public Style BulletStyle { get { return (Style)GetValue(BulletStyleProperty); } set { this.SetValue(BulletStyleProperty, value); } } When I put the string "Rectangle" in for BulletStyle in xaml it hits the ConvertFrom method in my converter. However, when I use XamlWriter.Save() to serialise this, the property does not appear as an attribute in the string which is produced. I have implemented ConvertTo and put a breakpoint on, which is never hit. I have implemented CanConvertTo and put a breakpoint on, which IS hit and returns true. So i'm stumped as to why ConvertTo never fires.

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  • Unix shell script with Iseries command

    - by user293058
    I am trying to ftp a file from unix to as400 and executing iseries command in the script. ftp is working fine,I am getting an error in jobd command as HOST=KCBNSXDD.svr.us.bank.net USER=test PASS=1234 #This is the password for the FTP user. ftp -env $HOST << EOF # Call 2. Here the login credentials are supplied by calling the variables. user $USER $PASS # Call 3. Here you will change to the directory where you want to put or get cd "\$QARCVBEN" # Call4. Here you will tell FTP to put or get the file. #Ebcdic #Mode b quote site crtccsid *user quote site crtccsid *sysval put prod.txt quote rcmd sbmjob cmd(call pgm(pmtiprcc0) parm('prod' 'DEV')) job(\$pmtiprcc) jobd(orderbatch) 550-Error occurred on command SBMJOB cmd(call pgm(pmtiprcc0)) job($pmtiprcc) jobd(orderbatch). 550 Errors occurred on SBMJOB command.. 221 QUIT subcommand received.

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  • the best method for google indexing text content in images?

    - by dnuske
    Hi everybody, I have a webpage where I put 1 image once in a while, this is just like xkcd.com I would like to know how to let google know the text in my images. My approach is to put the text in alt html attribute, like this: <img src="http://myapokalips.com/public/cartoons/021_Robot_Tattoo.png" alt="RETARD - aw, that's a sick tattoo! - yea, bro, it means 'strength'" /> is that right? or should I put the text in some random metatag? thank you in advance.

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  • in rails should i be installing as a gem or a plugin

    - by drake
    I am trying to use acts_as_audited plugin. Should I be installing it as a gem (put it in environment.rb) or a plugin? what is the advantage of one over the other. Later on I plan to put this app on the clients server for permanent hosting. so am I better off having it as a gem? if it is as a gem ...when i put the app on the clients server..will I not have to get this plugin again?

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  • python: subclass a metaclass

    - by Michael Konietzny
    Hello, for putting methods of various classes into a global registry I'm using a decorator with a metaclass. The decorator tags, the metaclass puts the function in the registry: class ExposedMethod (object): def __init__(self, decoratedFunction): self._decoratedFunction = decoratedFunction def __call__(__self,*__args,**__kw): return __self._decoratedFunction(*__args,**__kw) class ExposedMethodDecoratorMetaclass(type): def __new__(mcs, name, bases, dct): for obj_name, obj in dct.iteritems(): if isinstance(obj, ExposedMethod): WorkerFunctionRegistry.addWorkerToWorkerFunction(obj_name, name) return type.__new__(mcs, name, bases, dct) class MyClass (object): __metaclass__ = DiscoveryExposedMethodDecoratorMetaclass @ExposeDiscoveryMethod def myCoolExposedMethod (self): pass I've now came to the point where two function registries are needed. The first thought was to subclass the metaclass and put the other registry in. For that the new method has simply to be rewritten. Since rewriting means redundant code this is not what I really want. So, it would be nice if anyone could name a way how to put an attribute inside of the metaclass which is able to be read when new is executed. With that the right registry could be put in without having to rewrite new. Thanks and Greetings, Michael

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  • Can django's auth_user.username be varchar(75)?

    - by perrierism
    Django's auth_user.username field is 30 characters. That means you can't have auth_user.username store an email address. If you want to have users authenticate based on their email address it would seem you have to do some wonky stuff like writing your own authentication backend which authenticates based on (email, password) instead of (username, password) and furthermore, figuring out what you're going to put in the username field since it is required and it is a primary key. Do you put a hash in there, do you try to put the id in there... bleh! Why should you have to write all this code and consider edge cases simply because username is too small for your (farily common) purposes? Is there anything wrong with running alter table on auth_user to make username be varchar(75) so it can fit an email? What does that break if anything?

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  • 1 domain.. 2 server and 2 applications

    - by basit.
    i have a site like twitter.com on server one and on server two i have forum, which path is like domain.com/forum on server one i wanted to implement wild card dns and put main domain on it. but on server two i wanted to keep forum separate, i cant give sub-domain forum.domain.com, because all its links are already put in search engines and link back to domain.com/forum. so i was wondering, how can i put domain and wild card dns on server one and still able to give path on server 2 for domain.com/forum (as sub-folder). any ideas? do you think htaccess can do that job? if yes, then how?

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  • table class in php

    - by user225269
    Is it possible to put a table class in php, like this: echo "<table class='xd' border='1'> <tr> <th>IDNO</th> <th>ADDRESS</th> <th>LASTNAME</th> <th>FIRSTNAME</th> </tr>"; I have a table inside a table. The outside table is html. And if I only put table in the css. It will affect both. But when I put class in the table with php script. It won't work. Please help.

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  • ServerAlias www.example.com is not recognized

    - by Tianzhou Chen
    Below is my config file: NameVirtualHost 12.34.56.78:80 < VirtualHost 12.34.56.78:80 ServerAdmin [email protected] ServerName domain1.com ServerAlias www.domain1.com DocumentRoot /srv/www/domain1.com/public_html1/ ErrorLog /srv/www/domain1.com/logs/error.log CustomLog /srv/www/domain1.com/logs/access.log combined < /VirtualHost < VirtualHost 12.34.56.78:80 ServerAdmin [email protected] ServerName domain2.com ServerAlias www.domain2.com DocumentRoot /srv/www/domain2.com/public_html1/ ErrorLog /srv/www/domain2.com/logs/error.log CustomLog /srv/www/domain2.com/logs/access.log combined < /VirtualHost The thing is when I put www.domain1.com into browser, apache2 doesn't retrieve the web page resides in /srv/www/domain1.com/public_html1/, instead, it gets the page from the default document root defined in another file. However, if I put www.domain2.com, everything works fine. I don't see any difference between two VirtualHost config block, so I wonder what does make the difference. BTW, I haven't put any .htaccess file under their document root. Thanks for your advice! Tianzhou

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  • Scala type conversion error, need help!

    - by Mansoor Ashraf
    Hello I am getting a weird error when trying to use a Java map in Scala. This is the snippet of code val value:Double = map.get(name) if (value eq null) map.put(name, time) else map.put(name, value + time) the map is defined as val map=new ConcurrentHashMap[String,Double] and this is the error I am getting error: type mismatch; found : Double required: ?{val eq: ?} Note that implicit conversions are not applicable because they are ambiguous: both method double2Double in object Predef of type (Double)java.lang.Double and method doubleWrapper in object Predef of type (Double)scala.runtime.RichDouble are possible conversion functions from Double to ?{val eq: ?} if (value eq null) map.put(name, time) I am new to Scala so I am having a hard time parsing the stacktrace. Any help would be appreciated

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  • The Bizarre Hidden Powers of the Preprocessor? [closed]

    - by ApprenticeHacker
    The preprocessor in C and C++ deserves an entire essay on its own to explore its rich possibilities for obfuscation. It is true that the C++ (and C) preprocessor can be used for a lot of powerful stuff. #ifdefs and #defines are often used to determine platforms, compilers and backends. Manipulating the code likewise. However, can anyone list some of the most powerful and bizarre things you can do with the preprocessor? The most sinister use of the preprocessor I've found is this: #ifndef DONE #ifdef TWICE // put stuff here to declare 3rd time around void g(char* str); #define DONE #else // TWICE #ifdef ONCE // put stuff here to declare 2nd time around void g(void* str); #define TWICE #else // ONCE // put stuff here to declare 1st time around void g(std::string str); #define ONCE #endif // ONCE #endif // TWICE #endif // DONE This declares different things based on how many times the header is included. Are there any other bizarre unknown powers of the C++ preprocessor?

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  • Help with split

    - by Andeeh
    I have something that splits each line of a file. here is a sample of a line it might split "James","Project5","15/05/2010","3" I have this code Private Sub Command1_Click() Open jobs For Input As #1 Do While Not EOF(1) Line Input #1, tmpstring splititems = Split(tmpstring, ",") Form1.Print splititems(0) Form1.Print splititems(1); Form1.Print splititems(2); Form1.Print splititems(3) Loop Close #1 End Sub I would like it to instead of outputting a name each time there is a name, just put the project under the name that is already there. e.g. if there was another line in the file with the name james and he had been working on project 2 in that line I would like it to just put project 2 under the "James" that had already been put on the form. Any help would be fantastic

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  • How to delete a contact in android 2.1

    - by Rishabh
    Hi, I have added one contact to android by following code. ContentValues values = new ContentValues(); Uri rawContactUri = getContentResolver().insert(RawContacts.CONTENT_URI, values); long rawContactId = ContentUris.parseId(rawContactUri); values.clear(); values.put(Data.RAW_CONTACT_ID, rawContactId); values.put(Data.MIMETYPE, StructuredName.CONTENT_ITEM_TYPE); values.put(StructuredName.DISPLAY_NAME, "Mike Sullivan"); getContentResolver().insert(Data.CONTENT_URI, values); It shows up on emulator 2.1, but when i am going to delete it manually by "delete contact" option, its not deleteing from emulator. If I edit some thing on it then only it deletes. How can i directly delete it from menu ? Thanks in advance...

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  • Rails, REST Architecture and HTML 5: Cross domain requests with pre-flight requests

    - by Orion
    While working on a project to make our site HTML 5 friendly, we were eager to embrace the new method for Cross Domain requests (no more posting through hidden iframes!!!). Using the Access Control specification we begin setting up some tests to verify the behaviour of various browsers. The current Rails RESTful architecture relies on the four HTTP verbs: GET, POST, PUT, DELETE. However in the Access Control spec, it dictates that non-simple methods (PUT, DELETE) require a pre-flight request using the HTTP verb OPTIONS. In addition during testing we discovered that Firefox 3.5.8 pre-flight POST requests as well. My question is this. Is anyone aware of any project for the Rails framework working to address the issue? If not, any opinions about the best strategy to support the OPTIONS method, since it has to support the routes for all the POST, PUT, DELETE methods?

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  • How to use a variable in an awk expression

    - by lugte098
    I'm trying to make this command: sed bla bla filename | awk '{printf "%s %s_entry_%.3f %.3f %.3f %.3f",$1,$3,$4,$5,$6,$7}' But the thing is, i want the %.3f part to be variable. So in one case it could be %.3f and in another it could be %.3f %.3f %.3f. So i'll just use a static one in my example code for clarity. So if i want 4 of these %.3f and put them in variable $values like so: values="%.3f %.3f %.3f %.3f" Then how can i put this string in the awk expression, without making awk to just put literally "${values}" in there. The following is my non-working-attempt: sed bla bla filename | awk '{printf "%s %s_entry_${values}",$1,$3,$4,$5,$6,$7}'

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  • Ruby on Rails: Routing error

    - by JamesMcL13
    I am having trouble deleting and showing user records. Here is my routes.rb FinalApp::Application.routes.draw do resources :admin devise_for :users, :controllers => { :registrations => 'admin' } resources :projects match "search" => "projects#search", :as => :search root :to => 'projects#index' end Here is my admin controller: class AdminController < ApplicationController def index @users = User.all respond_to do |format| format.html # index.html.erb format.json { render :json => @users } end end def create @user = User.new(params[:user]) respond_to do |format| if @user.save format.html { redirect_to @user, notice: 'User was successfully created.' } format.json { render json: @user, status: :created, location: @user } else format.html { render action: "new" } format.json { render json: @user.errors, status: :unprocessable_entity } end end end # GET /users/1 # GET /users/1.json def show @user = User.find(params[:id]) @user_user_id = params[:id] respond_to do |format| format.html # show.html.erb format.json { render json: @user } end end # GET /users/new # GET /users/new.json def new @user = User.new respond_to do |format| format.html # new.html.erb format.json { render json: @user } end end # GET /users/1/edit def edit @user = User.find(params[:id]) end # POST /users # POST /users.json # PUT /users/1 # PUT /users/1.json def update @user = User.find(params[:id]) respond_to do |format| if @user.update_attributes(params[:user]) format.html { redirect_to @user, notice: 'User was successfully updated.' } format.json { head :no_content } else format.html { render action: "edit" } format.json { render json: @user.errors, status: :unprocessable_entity } end end end # DELETE /users/1 # DELETE /users/1.json def destroy @user = User.find(params[:id]) @user.destroy respond_to do |format| format.html { redirect_to users_url } format.json { head :no_content } end end end Here is my view: <%= stylesheet_link_tag "admin" %> <body> <div id ="title1">Admin</div> <div class ="menu"></div> <div id ="section3"> <table id = "mytable"> <table border = "1"> <tr> <th>Username </th> <th>Email</th> <th>First Name</th> <th>Last Name</th> <th>Admin?</th> <th></th> <th></th> <th></th> </tr> <%= link_to "New User", admin_new_path %><br /> <% @users.each do |t| %> <tr> <td><%= t.username %></td> <td><%= t.email %></td> <td><%= t.firstname %></td> <td><%= t.lastname %></td> <td><%= t.admin %></td> <td><%= link_to 'Show', t %></td> <td> <%= button_to "Delete", t, method: :delete, data: { confirm: 'Are you sure?' } %></td> </tr> <% end %> </table></br> </body> </html> I can display the User database, but when I go to delete a record. I get this error No route matches [DELETE] "/users/11". I am new to rails so please remember this when trying to help. Thanks in advance. Edit: here are my routes = admin_index GET /admin(.:format) admin#index POST /admin(.:format) admin#create new_admin GET /admin/new(.:format) admin#new edit_admin GET /admin/:id/edit(.:format) admin#edit admin GET /admin/:id(.:format) admin#show PUT /admin/:id(.:format) admin#update DELETE /admin/:id(.:format) admin#destroy new_user_session GET /users/sign_in(.:format) devise/sessions#new user_session POST /users/sign_in(.:format) devise/sessions#create destroy_user_session DELETE /users/sign_out(.:format) devise/sessions#destroy user_password POST /users/password(.:format) devise/passwords#create new_user_password GET /users/password/new(.:format) devise/passwords#new edit_user_password GET /users/password/edit(.:format) devise/passwords#edit PUT /users/password(.:format) devise/passwords#update cancel_user_registration GET /users/cancel(.:format) admin#cancel user_registration POST /users(.:format) admin#create new_user_registration GET /users/sign_up(.:format) admin#new edit_user_registration GET /users/edit(.:format) admin#edit PUT /users(.:format) admin#update DELETE /users(.:format) admin#destroy projects GET /projects(.:format) projects#index POST /projects(.:format) projects#create new_project GET /projects/new(.:format) projects#new edit_project GET /projects/:id/edit(.:format) projects#edit project GET /projects/:id(.:format) projects#show PUT /projects/:id(.:format) projects#update DELETE /projects/:id(.:format) projects#destroy search /search(.:format) projects#search root / projects#index

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  • How do I place a DIV tag image on the very top of the page in HTML5?

    - by Jacob
    Hello there. I'm trying to put an x-repeat "grid" of images by using background-image in CSS, then using the id in a DIV tag. My intention is to put a sort of "panel", then always extends to the very top of the page, and loops with repeat-x. It works just fine without a DOCTYPE, but when I put the clean in the code, it pushes the image in the tag downwards, as if there's a margin on the top of the page of about 15 px or so. I tried top-margin, z-index, with no success. Excuse me if I'm asking a silly question, but I'm sort of new. Thanks, -Jacob

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  • SSIS - How do I see/set the field types in a Recordset?

    - by thursdaysgeek
    I'm looking at an inherited SSIS package, and a stored procedure is sending records to a recordset called USER:NEW_RECORDS. It's of type Object, and the value is System.Object. It is then used for inputting that data to a SQL table. We're getting an error, because it seems that the numeric results of the stored procedure are being put in a DT_WSTR field, and then failing when it is then put into a decimal field in the database. Most of the records are working, but one, which happens to have a longer number of decimal digits, is failing. I want to see exactly what my SSIS recordset field types are, and probably change them, so I can force the data to be truncated properly and copied. Or, perhaps, I'm not even looking at this correctly. The data is put into the recordset using a SQL Task that executes the stored procedure.

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  • Deploy custom web service to sharepoint server(2007/2010)?

    - by leif
    According to MSDN, for deploying custom web service, we need to create *wsdl.aspx and *disco.aspx files, and put them with .asmx together under _vti_bin folder (C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\isapi). And put the dll under bin folder of the root of sharepoint virtual directory. It works correctly for me. However, i also found that if i put .asmx file under the root virtual directory without creating those *wsdl.aspx and *disco.aspx files. It can work as well and much easier than the above way. So i'm wondering what's the potential issues in this way?

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  • storing data in a database using edit text and button

    - by user1841444
    Hai im trying to Insert data into database using EditText and Button i have created. Im stuck at Activity part of the Code.I unbale to proceed how to write the Onclick action part for Button and EditText part Please help me. Im new to android DBAdapter.java package com.example.database1; import android.content.ContentValues; import android.content.Context; import android.database.Cursor; import android.database.SQLException; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteOpenHelper; import android.util.Log; public class DBAdapter { public static final String KEY_ROWID = "_id"; public static final String KEY_ISBN = "isbn"; public static final String KEY_TITLE = "title"; public static final String KEY_PUBLISHER = "publisher"; private static final String TAG = "DBAdapter"; private static final String DATABASE_NAME = "books"; private static final String DATABASE_TABLE = "titles"; private static final int DATABASE_VERSION = 1; private static final String DATABASE_CREATE = "create table titles (_id integer primary key autoincrement, " + "isbn text not null, title text not null, " + "publisher text not null);"; private final Context context; private DatabaseHelper DBHelper; private SQLiteDatabase db; public DBAdapter(Context ctx) { this.context = ctx; DBHelper = new DatabaseHelper(context); } private static class DatabaseHelper extends SQLiteOpenHelper { DatabaseHelper(Context context) { super(context, DATABASE_NAME, null, DATABASE_VERSION); } @Override public void onCreate(SQLiteDatabase db) { db.execSQL(DATABASE_CREATE); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { Log.w(TAG, "Upgrading database from version " + oldVersion + " to " + newVersion + ", which will destroy all old data"); db.execSQL("DROP TABLE IF EXISTS titles"); onCreate(db); } } //---opens the database--- public DBAdapter open() throws SQLException { db = DBHelper.getWritableDatabase(); return this; } //---closes the database--- public void close() { DBHelper.close(); } //---insert a title into the database--- public long insertTitle(String isbn, String title, String publisher) { ContentValues initialValues = new ContentValues(); initialValues.put(KEY_ISBN, isbn); initialValues.put(KEY_TITLE, title); initialValues.put(KEY_PUBLISHER, publisher); return db.insert(DATABASE_TABLE, null, initialValues); } //---deletes a particular title--- public boolean deleteTitle(long rowId) { return db.delete(DATABASE_TABLE, KEY_ROWID + "=" + rowId, null) > 0; } //---retrieves all the titles--- public Cursor getAllTitles() { return db.query(DATABASE_TABLE, new String[] { KEY_ROWID, KEY_ISBN, KEY_TITLE, KEY_PUBLISHER}, null, null, null, null, null); } //---retrieves a particular title--- public Cursor getTitle(long rowId) throws SQLException { Cursor mCursor = db.query(true, DATABASE_TABLE, new String[] { KEY_ROWID, KEY_ISBN, KEY_TITLE, KEY_PUBLISHER }, KEY_ROWID + "=" + rowId, null, null, null, null, null); if (mCursor != null) { mCursor.moveToFirst(); } return mCursor; } //---updates a title--- public boolean updateTitle(long rowId, String isbn, String title, String publisher) { ContentValues args = new ContentValues(); args.put(KEY_ISBN, isbn); args.put(KEY_TITLE, title); args.put(KEY_PUBLISHER, publisher); return db.update(DATABASE_TABLE, args, KEY_ROWID + "=" + rowId, null) > 0; } } DatabaseActivity.java package com.example.database1; import android.os.Bundle; import android.app.Activity; import android.database.Cursor; import android.view.Menu; import android.widget.Toast; public class DatabaseActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_database); DBAdapter db=new DBAdapter(this); db.open(); } } activity_database.xml: <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent"> <EditText android:id="@+id/edit1" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <EditText android:id="@+id/edit2" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <EditText android:id="@+id/edit3" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <Button android:id="@+id/submit" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </LinearLayout>

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  • Netbeans jar file icon problems

    - by Erma
    I finally found how to make an exe project in Netbeans, so a jar file and execute it from the DESKTOP. The only problem I have ocurred is that after I open the jar file and login with my username and password the button icons are not shown, if I put a string it appears but if I put the image it doesn't appear. So,I had to restore this code: JButton btnNew = new JButton(new ImageIcon("new.gif")); JButton btnUpdate = new JButton(new ImageIcon("NotePad.gif")); JButton btnDelete = new JButton(new ImageIcon("delete.gif")); JButton btnSearch = new JButton(new ImageIcon("find.gif")); and put this one: JButton btnNew = new JButton("ADD"); JButton btnUpdate = new JButton("Update"); JButton btnDelete = new JButton("Delete"); JButton btnSearch = new JButton("Search"); It now works but I would like to have the icons please. Any idea?

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  • xml with special character, encoding utf-8

    - by Sergio Morieca
    I have a few simple questions, because I got confused reading all difference responses. 1) If I have an xml with prolog: and I'm going to unmarshall it with Java (for example: JaXB). I suppose, that I can't put CROSS OF LORRAINE (http://www.fileformat.info/info/unicode/char/2628/index.htm) inside, but I can put "\u2628", correct? 2) I've also heard that UTF-8 doesn't contain it, but anything in Unicode can be saved with encoding UTF-8 (or UTF-16), and here is an example from this page: UTF-8 (hex) 0xE2 0x98 0xA8 (e298a8) Is my reasoning correct? Can I use this form and put it in the xml with utf-8 encoding?

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  • Cannot run an executable binary file on another Linux System??

    - by Claire Huang
    I'm using Ubuntu 10.04 and Qt4.6, and I've created an executable binary file on my own computer through QtCreator. Now I want to put my executable file on CentOS 5, but it seems that this executable file cannot run on CentOS. Do I need to set some compile parameters to make it runnable on Linux other than Ubuntu?? Or do I need to put some lib files with the executable binary file? (For windows, the .exe file should put together with some .dll files to provide the correct dynamic lib linkage, is there some similar problem on linux?) Thanks for your help!

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  • hackage package dependencies and future-proof libraries

    - by yairchu
    In the dependencies section of a cabal file: Build-Depends: base >= 3 && < 5, transformers >= 0.2.0 Should I be doing something like Build-Depends: base >= 3 && < 5, transformers >= 0.2.0 && < 0.3.0 (putting upper limits on versions of packages I depend on) or not? I'll use a real example: my "List" package on Hackage (List monad transformer and class) If I don't put the limit - my package could break by a change in "transformers" If I do put the limit - a user that uses "transformers" but is using a newer version of it will not be able to use lift and liftIO with ListT because it's only an instance of these classes of transformers-0.2.x I guess that applications should always put upper limits so that they never break, so this question is only about libraries: Shall I use the upper version limit on dependencies or not?

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