postgis - formatting/parsing form values in Ruby on Rails -


i working rgeo (postgis) , ruby on rails, total newbie both. i've got model contains coordinates attribute (latitude & longitude). using text input field when binding form that attribute, wanted format value human readable form. being 'rendered' raw db value, i.e., '0101000020e61000009468c9e3698c5ec065fed13769d64740'. i'd format '-122.193963, 47.675086' user. conversely, if user updates value, need parse format postgis can understand.

i've been searching , reading can find binding data forms in ror, can't find useful.

you seeing hex-encoded representation of well-known binary (wkb). there many geometry accessors coordinate information in different formats or representations. example:

select st_astext(geom) wkt, st_y(geom) latitude, st_x(geom) longitude (   select '0101000020e61000009468c9e3698c5ec065fed13769d64740'::geometry geom ) f;               wkt              | latitude  |  longitude ------------------------------+-----------+-------------  point(-122.193963 47.675086) | 47.675086 | -122.193963

on ruby rgeo side, similar information can obtained using wkbparser. example, in tc_wkb_parser.rb similar:

parser_ = ::rgeo::wkrep::wkbparser.new obj_ = parser_.parse('0101000020e61000009468c9e3698c5ec065fed13769d64740') print [obj_.y, obj_.x]  # [-122.193963, 47.675086]

Comments

Post a Comment

Popular posts from this blog

get url and add instance to a model with prefilled foreign key :django admin -

Image
i have page in each contest shown in row. each row contains contest id , link other model names have foreign key contest. news model: class news(models.model): title = models.charfield(max_length=50, null=true) description = models.textfield() time = models.timefield( default= datetime.datetime.now().time()) contest = models.foreignkey(contest) i want use admin adding , changing these models. want when user clicks on 'news' has foreign key contest id=1, shows list of news value foreign key. use {% instance in instances %} <tr class="{% cycle 'row1' 'row2' %}"> <td>{{ instance.title }}</td> <td>{{ instance.starttime }}</td> <td>{{ instance.timespan }}</td> <td>{{ instance.date }}</td> <td><a href="/adm...
Read more

android - Keyboard hides my half of edit-text and button below it even in scroll view -

i having trouble keyboard covers edit-text , half of button in scroll view. here's layout , please tell me how should resolve problem. many questions on topic none of them s working me. <?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:background="@drawable/bg" android:layout_height="match_parent"> <scrollview android:layout_width="match_parent" android:fillviewport="true" android:layout_height="match_parent"> <relativelayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical"> <linearlayout android:layout_width="match_parent" android:layout_height="w...
Read more

css - Make div keyboard-scrollable in jQuery Mobile? -

from can tell, although jquery-mobile-powered pages can contain divs overflow set scroll or auto, , these divs can scrolled one-screen bar or mouse wheel, cannot scrolled using arrow keys, page-up/page-down, or home/end. instead, official "page" div (with data-role="page") absorbs input. perhaps other divs can't acquire focus, i'm not sure. is there way around this? edit: jsfiddle of simple example: https://jsfiddle.net/qogz0shx/ <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script> <script src="https://ajax.googleapis.com/ajax/libs/jquerymobile/1.4.5/jquery.mobile.min.js"> </script> <link rel="stylesheet" href="https://code.jquery.com/mobile/1.4.5/jquery.mobile-1.4.5.css"/> <style> #outer { overflow:scroll; height: 50vh; width: 50vw; } #inner { height: 500vh; width: 500vw; } ...
Read more