PouchDB designing for forwards compatibility -


i starting out pouchdb , looking solution allow me change schema in future without major pain, don't have worry if have thought of everything. i'm seeking plan case might need change structure didn't predict (example: let's start concept of single "wish list" later support multiple named lists instead).

the high level idea have have internally-meaningful "schema version" saved every pouchdb instance. client side js read in, , if there data migration necessary, can perform before continuing. there "best practice" ways this?

there's plugin called pouchdb-migrate can use accomplish this. keeping integer version fine; can use "duck versioning" (e.g. "i'm adding lastname field in v2, if there's no lastname, document must v1").


Comments

Post a Comment

Popular posts from this blog

c++ - Difference between pre and post decrement in recursive function argument -

i have following sample code used pre-decrement void function(int c) { if(c == 0) { return; } else { cout << "dp" << c << endl; function(--c); cout << c << endl; return; } } this function give output input 4 : dp3 dp2 dp1 dp0 0 1 2 3 but when use post decrement void function(int c) { if(c == 0) { return; } else { cout << "dp" << c << endl; function(c--); cout << c << endl; return; } } output goes in infinite loop dp4 can explain me in detail why happens ? this happens because function(c--) called same value of c , when finishes c decremented. recursively called, hence called same value no chance of return , hit stack overflow error. assume this, int x = 1, y = 0; y = x++ result y == 1 , x == 2. if y = ++x , bot x , y 2.
Read more

c# - Retrieve google contact -

i'm using .net retrieve contact info google contact. however, retrieves including sent email not stored in contact. there anyway can retrieve contact contact? here code requestsettings rs = new requestsettings("", email, password); rs.autopaging = true; contactsrequest cr = new contactsrequest(rs); feed<contact> contacts = cr.getcontacts(); foreach (contact contact in contacts.entries) { name name = contact.name; response.write(name.givenname + " " + name.familyname + "<br/>"); foreach (email emailid in contact.emails) { response.write(emailid.address + "<br/>"); } response.write("<br/>"); } im using google.gdata.contacts package nuget v 2.2.0 string redirecturi = "urn:ietf:wg:oauth:2.0:oob"; // build base oauth2 parameters var oauth2
Read more

javascript - How to insert selected radio button value into table cell -

i have 5 radio buttons <input type="radio" id="rating">1 <input type="radio" id="rating2">2 <input type="radio" id="rating3">3 <input type="radio" id="rating4">4 <input type="radio" id="rating5">5 i have 1 table <table id="mytabledata" border="1" style="width:100%"> <tr id="templaterow"> <th>ratings</th> </tr> </table> one add button <input type="button" id="add" value="add" onclick="addradiovalue()"> i've written code dynamically add rows table, when select radio button , click on add button, value of selected radio button should inserted new cell within table ratings. i able thing text box, i'm not able radio button. can me? your problems didn't have name set on radios , tryi
Read more