Ruby on Rails

Thank you for the heads-up Sam!

 

-Blake

From: samsaffron
Sent: Wednesday, March 25, 2020 21:56
To: Ruby on Rails: Talk
Subject: [Rails] We are moving to https://discuss.rubyonrails.org/

 

Hi There,

 

The Rails team has decided to migrate all the talk, docs and core Google groups to  https://discuss.rubyonrails.org/.

 

Starting from can you post any talk discussion there. If you are having any trouble finding your bearings I will be watching closely and do my best to help out!

 

The theme used on the forum is open source and accepts contributions https://github.com/rails/discourse-rubyonrails-theme

 

See you on the forum! We will be locking this group shortly and migrating the final missing posts over to the new home.

 

Sam  

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It appears that you have configured a database, but that database isn't running correctly, or doesn't have a user named "root". That name is commonly used in a default MySQL install. If you're using a different database engine, then the default user may be named differently. That's where I would start looking. The answer will be very specific to your own server.

Walter

> On Mar 23, 2020, at 11:11 AM, Thouba Nahakpam <samsungmeitei@gmail.com> wrote:
>
> Hello,
> When I try to access localhost:3000, it shows ActiveRecord::NoDatabaseError. Can anybody tell me how to fix it? I have attached a screenshot of it below.
> Thanks.
>
> <RAD.JPG>
>
>
>
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San Ji, thank for your answer.  But how does Ruby runtime know which function to call?  There must be a way for human to mimic that...  Right?

On Sat, Mar 21, 2020 at 10:35 AM San Ji <sarun101@gmail.com> wrote:

To my knowledge, what you are looking for is not possible for Ruby.

What you got in RubyMine is the closest, basically it index all words and apply some language heuristics to scope down choices. This is good enough in most cases.

Systematic way to do it is impossible because Ruby supports metaprogramming.
Take ActiveRecord as an example, you got attribute-related methods that defines in databases, not even in Ruby code. If you connect to different databases, the method definitions will be different. Nothing can even point that out (represent that) properly, at least not with user interface of an IDE.

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To my knowledge, what you are looking for is not possible for Ruby.

What you got in RubyMine is the closest, basically it index all words and apply some language heuristics to scope down choices. This is good enough in most cases.

Systematic way to do it is impossible because Ruby supports metaprogramming.
Take ActiveRecord as an example, you got attribute-related methods that defines in databases, not even in Ruby code. If you connect to different databases, the method definitions will be different. Nothing can even point that out (represent that) properly, at least not with user interface of an IDE.

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I meant, specifically, their new open-source video offering. They have a bunch of quick-start code that you can use to build a whole custom videoconferencing rig. I haven't dug into it in depth, but Twilio usually do a very thorough job of documenting (and writing) their applications.

Walter

> On Mar 19, 2020, at 9:59 PM, tom <tomabroad@gmail.com> wrote:
>
> yes thank you, used them for sms...
>
>
>
> On Thu, Mar 19, 2020, 5:18 PM Walter Lee Davis <waltd@wdstudio.com> wrote:
> Have you looked at this yet? https://www.twilio.com/docs/video
>
> Walter
>
> > On Mar 19, 2020, at 5:00 PM, tom <tomabroad@gmail.com> wrote:
> >
> > hi,
> >
> > i have just finished a webrtc chat via action cable, but before spending even more time on it trying to get video on as well, i was wondering if anyone can share any 'tips' or guides.
> >
> > thank you all in advance
> >
> >
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Have you looked at this yet? https://www.twilio.com/docs/video

Walter

> On Mar 19, 2020, at 5:00 PM, tom <tomabroad@gmail.com> wrote:
>
> hi,
>
> i have just finished a webrtc chat via action cable, but before spending even more time on it trying to get video on as well, i was wondering if anyone can share any 'tips' or guides.
>
> thank you all in advance
>
>
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When dealing with polymorphic associations, is it possible to have a has_many through query that pulls in ALL available source_types?

My understanding so far is that each source type needs its own query method, as I show here in the Image model

**image.rb**

```

has_many :image_tags

has_many :tags, through: :image_tags, source: :taggable, source_type: 'Tag'

has_many :people, through: :image_tags, source: :taggable, source_type: 'Person'

has_many :businesses, through: :image_tags, source: :taggable, source_type: 'Business'

...

```

**tag.rb**

```

has_many :image_tags, as: :taggable

has_many :images, through: :image_tags

```

**image_tag.rb**

```

belongs_to :image

belongs_to :taggable, polymorphic: true

def build_taggable(params)

  self.taggable = taggable_type.constantize.new(params)

end

```

What I'd like to be able to do, however, is create one query method that pulls in all associated records regardless of what source_type they might belong to.

Just thinking out loud, would that likely involve creating some sort of raw SQL join that acts directly on the ImageTags table? Or is there a more Railsy/ActiveRecordy way of approaching it? 

Thank you in advance for any help or insights!

-Blake

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Hassan,


On 2020-03-15 11:31, Hassan Schroeder wrote:
> On Sat, Mar 14, 2020 at 3:52 PM Philip Rhoades <phil@pricom.com.au>
> wrote:
>
>> Docker crashed and I lost the Rails container so I have to go back to
>> the original source.
>
> I don't know what "lost the Rails container" means. Can't you just
> rerun the Dockerfile?


No.


>> Could someone suggest how I could fix the problem seen below? - I
>> deleted the Gemfile.lock file first.
>
> Why?


Because leaving the original lock file there caused "bundle install
--path vendor/bundle" to fail with:

Installing json 1.8.3 with native extensions
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

     current directory:
/home/phr/src/ruby/rails/domain-sf/vendor/bundle/ruby/2.6.0/gems/json-1.8.3/ext/json/ext/generator
/usr/bin/ruby -I /usr/share/rubygems -r
./siteconf20200315-119213-1sg3qup.rb extconf.rb
creating Makefile

current directory:
/home/phr/src/ruby/rails/domain-sf/vendor/bundle/ruby/2.6.0/gems/json-1.8.3/ext/json/ext/generator
make "DESTDIR=" clean
rm -f
rm -f generator.so  *.o  *.bak mkmf.log .*.time

current directory:
/home/phr/src/ruby/rails/domain-sf/vendor/bundle/ruby/2.6.0/gems/json-1.8.3/ext/json/ext/generator
make "DESTDIR="
gcc -I. -I/usr/include -I/usr/include/ruby/backward -I/usr/include -I.
-DJSON_GENERATOR    -fPIC -O2 -g -pipe -Wall -Werror=format-security
-Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions
-fstack-protector-strong
-grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1
-specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -mtune=generic
-fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection
-fPIC -m64 -o generator.o -c
generator.c
generator.c: In function 'generate_json':
generator.c:861:25: error: 'rb_cFixnum' undeclared (first use in this
function); did you mean 'mFixnum'?
   861 |     } else if (klass == rb_cFixnum) {
       |                         ^~~~~~~~~~
       |                         mFixnum
generator.c:861:25: note: each undeclared identifier is reported only
once for each function it appears in
generator.c:863:25: error: 'rb_cBignum' undeclared (first use in this
function); did you mean 'mBignum'?
   863 |     } else if (klass == rb_cBignum) {
       |                         ^~~~~~~~~~
       |                         mBignum
make: *** [Makefile:245: generator.o] Error 1

make failed, exit code 2

Gem files will remain installed in
/home/phr/src/ruby/rails/domain-sf/vendor/bundle/ruby/2.6.0/gems/json-1.8.3
for inspection.
Results logged to
/home/phr/src/ruby/rails/domain-sf/vendor/bundle/ruby/2.6.0/extensions/x86_64-linux/2.6.0/json-1.8.3/gem_make.out

An error occurred while installing json (1.8.3), and Bundler cannot
continue.
Make sure that `gem install json -v '1.8.3' --source
'https://rubygems.org/'` succeeds before bundling.

In Gemfile:
   rails was resolved to 4.1.5, which depends on
     actionmailer was resolved to 4.1.5, which depends on
       actionpack was resolved to 4.1.5, which depends on
         actionview was resolved to 4.1.5, which depends on
           activesupport was resolved to 4.1.5, which depends on
             json


>> $ ./bin/rails s
>> /home/phr/src/ruby/rails/domain-sf/vendor/bundle/ruby/2.6.0/gems/activesupport-4.1.5/lib/active_support/core_ext/object/duplicable.rb:82:
>> warning: BigDecimal.new is deprecated; use BigDecimal() method
>> instead.
>> => Booting Puma
>> => Rails 4.1.5 application starting in development on
>
> Did you originally develop this Rails 4.1.5 app using Ruby 2.6.0? Or
> I guess more exactly have you been running it on that Ruby version
> successfully?


I can't remember what version of Ruby it was - it was from earlier than
2015 . . it was running on whatever version of Ruby that was in the
container - which is gone because the whole docker setup was corrupted .
. I may have backups on old hard disks but it would take too long to try
and re-create old OS environment, Docker version etc so I thought the
best thing to do was just the Rails app running directly on my current
machine (Linux Fedora 31).

Thanks,

Phil.
--
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PO Box 896
Cowra  NSW  2794
Australia
E-mail:  phil@pricom.com.au

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> On Mar 14, 2020, at 12:17 PM, Rob Jonson <rob@hobbyistsoftware.com> wrote:
>
> thanks folks,
>
> I guess I'm asking more about the practical pain points. - As you say, I trust rails to deal with most of the day-to-day.
>
> do you end up battling to get your postgres install working after upgrading mac (or postgres?)

You can install Postgres as a user-space application (with an icon and everything), so this can be a non-issue.

> do you have problems with string encoding incompatibilities in obscure email addresses?

If it doesn't fit into UTF-8, then you may have a problem. Do you have a problem now, in MySQL? What encoding and charset are you using now?

> do you have a convenient gui for browsing (like SequelPro)

TablePlus is pretty nice.

> are there other similar annoyances, or does it 'just work'

Like another commenter posted, I have used it on Heroku with SQLite on the dev side, and no issues.

>
> whatever I use, I like to stick with the same db in dev & production, ( using mysql or sqlite for my tests and postgres on the server seems like it is asking for trouble)

It could be a problem, or it could be a sign that you are depending on a database feature to hide a bug. At work, we use SQLite for testing (including the CI stuff on GitLab) and Oracle on the production server. We try for 100% test coverage.

Walter

>
> cheers,
>
> Rob
>
>
>
>
> On Sat, 14 Mar 2020 at 15:17, Phil Edelbrock <edelbrp@gmail.com> wrote:
>
> I think Ariel's reply is spot-on.  Rails is basically DB agnostic, however I think the trend is that PostgreSQL is the more favored backend (except for stuff like Wordpress).  We're doing a lot more SQL procedural stuff these days with our rails apps (e.g. kicking out JSON from a single query can be literally 1,000x times faster in cases vs. asking Rails to query a model and format the same thing).  I find PostgreSQL a lot easier to admin as well, but to each their own.
>
> Good luck!
>
>
> Phil
>
>
>> On Mar 14, 2020, at 7:37 AM, Ariel Juodziukynas <arieljuod@gmail.com> wrote:
>>
>> Usually ActiveRecord takes care of most of the differences, and postresql has a lot of similarities with mysql. I guess it would be a different call if you ask about learning a completely different db engine like mongo or graphql, but learning postgresql shouldn't take too much time knowing MySQL, at least to be proficient. I even have a project that I used sqlite to prototype and postresql when deploying it to heroku for tests and I had to do nothing to make it work on both databases thanks to AR.
>>
>> Also, heroku prefers postrgres for example and heroku is really popular for rails hosting.
>>
>> El sáb., 14 mar. 2020 a las 10:58, Rob Jonson (<rob.jonson@gmail.com>) escribió:
>> Hi Folks,
>>
>> I have been using Mysql for forever, and broadly it works fine for me, with two complaints
>> 1) occasional issues with mismatches in encoding/collation on strings
>> 2) hours lost on every mac upgrade trying to get mysql working properly again
>>
>> I know that people are generally favouring postgresql these days, I'm wondering if anyone can comment on whether it's worth putting in the effort to learn a new db?
>>
>> all the best
>>
>> Rob
>>
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