mongodb - How to update the Embedded Data which is inside of another Embedded Data? -


i have document below in mongodb:

{     "_id": "test",     "tasks": [         {             "name": "task1",             "parameter": [                 {                     "name": "para1",                     "type": "string",                     "value": "*****"                 },                 {                     "name": "para2",                     "type": "string",                     "value": "*****"                 }             ]         },         {                "name": "task2",             "parameter": [                 {                     "name": "para1",                     "type": "string",                     "value": "*****"                 },                 {                     "name": "para2",                     "type": "string",                     "value": "*****"                 }             ]         }     ] }

there embedded data structure (parameter) inside of embedded data structure (tasks). want update para1 in task1's parameter.

i have tried many ways can use query tasks.parameter.name find para1 cannot update it. example in doc using .$. update value in embedded data structure doesn't work in case.

anyone have ideas ?

mongodb supports positional operator once, , top level array. there ticket server-831 change behavior use case. can follow issue there , vote it.

however, might able change approach accomplish want do. 1 way change schema. collapse tasks name array document looks this:

{ _id:test, tasks: [     {         task:1         name:para1,         type:string,         value:*****     },     {         task:1           name:para2,         type:string,         value:*****     },     {         task:2         name:para1,         type:string,         value:*****     },     {         task:2         name:para2,         type:string,         value:*****     } ] }

another approach may work use $pull , $push. instance replace task (this assumes tasks.parameter.name unique array of parameters): 

db.test2.update({$and: [{"tasks.name": "task3"}, {"tasks.parameter.name":"para1"}]}, {$pull: {"tasks.$.parameter": {"name": "para1"}}}) db.test2.update({"tasks.name": "task3"}, {$push: {"tasks.$.parameter": {"name": "para3", type: "string", value: 1}}})

with solution need careful regard concurrency, there brief moment document doesn't exist.


Comments

Post a Comment

Popular posts from this blog

apache - Remove .php and add trailing slash in url using htaccess not loading css -

i have add following code htaccess file removing .php extension , add trailing slash urls. worked fine reduced page loading speed , css code not loading @ all. pages ugly. please help rewriteengine on rewritebase / ## hide .php extension snippet # externally redirect /dir/foo.php /dir/foo rewritecond %{the_request} ^[a-z]{3,}\s([^.]+)\.php [nc] rewriterule ^ %1/ [r,l] # add trailing slash rewritecond %{request_filename} !-f rewritecond %{request_uri} !/$ rewriterule . %{request_uri}/ [l,r=301] # internally forward /dir/foo /dir/foo.php rewritecond %{request_filename} !-d rewritecond %{request_filename}.php -f rewriterule ^(.*?)/?$ $1.php [l] we can rewrite urls using .htaccess files. before writing in .htaccess files need verify kind of server using. can check server adding a <?php phpinfo(); ?> in php page. ensure mod_rewrite module enabled in apache server. can identified checking phpinfo included page. common methods used url rewriting follows ...
Read more

javascript - jQuery show full size image on click -

pretty self explanatory not workking . i want display full image when user click on image... yes know there tons of plugins but i want keep simple. any idea ? css : .full { display: none; width: 500px; height: 500px; margin-left: 100px; margin-top: -300px; position: fixed; background-color: #f00; z-index: 6; } .thumbnail { width: 50px; height: 50px; } html: <img class="thumbnail" src="http://4.bp.blogspot.com/-uhbdp2esxng/txneptvi92i/aaaaaaaaaky/upfqis7zto0/s1600/rihanna-wallpaper.jpg"> jquery: $(document).ready(function() { $('.thumbnail').on('click', function() { var img = $('<img />',{src:this.src,'class':'full'}); $('.full').html(img).show(); console.log('done!'); }); }); try looking how jquery works. $(document).ready(function() { $('.thumbnail').on('click', function(...
Read more