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[Music] hello friends welcome back to order development tutorial video we were discussing about the relation between models using three type of fields in the last videos like one-to-many many-to-many mini to one fields okay so in this video we are getting into a new area it's called inheritance so what is inheritance we know that what is inheritance it's therefore a basic programming concept and in oh do we do to basically two type of inheritance one is modern inheritance and another one is view inheritance okay so now we are going to model inheritance so in modern inheritance there are two inheritance mechanism to extend a feature of a model one is called traditional inheritance and another one is called delegation a hitter's I hope you can see the the picture so the traditional inheritance is if we look into the picture you can see there is one object okay there is one object this object one is a original object and it has some attributes in the tread under the traditional in Hinton's we have two types one is class inheritance prototype inheritance and the second part is delegation in hence in this dedication hilton's we have another mechanism so in this video we are going to talk about this okay this part the class infinitives and how we can do that in oh okay so this inheritance mechanism is used to add new features into the original object and new class compatible with existing list that means if we have already defined of you that you will be compatible with the modified more okay and stored in the same tablet so there will be no difference in tables or table name anything okay so these attributes that we extend on the object or the model will be stored in the same tablet okay so let's have a look at the Oh do here it's a example taken from the Codel you may have seen there is product template and product variants in the model so it's an example taken from product template here you can see the product template table is inherited so we put a class name front template we can use a different name here no problem but the inherit is equal to product dot double so what will happen is the next items you can see be om line IDs bo mi DS Bo and count use it in Bo and count these attributes will be added into the product load table model that is already defending somewhere else okay it may be it may be defending many other any other module okay so it will extend the functionality and attributes of that model and these additional functions will be added into the same model okay so it will extend the original object it will not create a new object it will extend it the original object so this type of inheritance can use it to add fields to a model or override the definition of a fields that is already the in the model and we can add some constraints okay database constrains to that model using this mechanism and you can also add some methods some functionalities like this okay we had here you can see some functionalities added into that model and we can also overwrite the existing model using in by using this method if if we if already the there is a method called action user in boem if we define the same here what we what it will be due at what it will do is it will overwrite the existing function using the definition what we put here so in this way we can do all these things using this method okay so in our open Academy I am going to show a small example let's get into that hey I have added a new file under our models directory it's called fortnight or py so it's inheriting restore partner so I put the instructor is equal to fields dot golian instructor it's a chick book it will be a check box okay now it's a building filled into it'll contain a true or false data default will be false and session IDs it's a many to many many to many field okay so this mini tavini field is connected to open Academy tour session so in our session under our sessions we can add many attendees so this is just the opposite area opposite side of that relation okay so that was the session was connected to restore partner now the session is connecting to sorry if the respondent does not partner is currently to open Academy toward session so what we have to do is we have to add this fire in ER in e dot P 1 so I have utterly added that now we are two fields in the partner now we have to add that you know user interface that means we have to put that in our eczema so what we have just discussed about is the model inheritance so the user interface will recur the view inheritance we will discuss that later but you can have a small look here you can see the partner dot instructor is the name that we are put for this view for this special view and field dot name is equal to model restored mana port field and inherit ID this is something that we are not seeing it okay if we check our Open Academy we have int be given that field value till now okay oh we K we have given our model and ID name model architecture and many thing the architecture of that form U but we haven't be given the inherit ID it so what we have is inherit ID the next attribute is reference is equal to base dot new partner for so it's just like what we did in model the partner dot py file we put inherit is equal to restore partner that same way we put we give a reference of a view that is already in another module that's already coded in another module the module name is called base and the view name is called view partner for we can see that here it will be in our base so yeah under the views your partner for okay let's check certainly file is in say restored partner abuse it's a view partner title foe so this is not the one we are looking for thoroughness so you've got a symbol for an transform support a short-form different kind of views for the same table same object and now this is our partner form okay so this view dot partner for this view is what we are going to extend okay in this form view we are going to add those boolean field and the many-to-many field that we are just created in our part or py so for that what we have that is we provided the ID of that for okay said id id view dot partner form so we provided that ID along with the module name okay so base dot you partner for is the inheritor ID of this view so we we'll be adding our two new fields in this form you that is already coded a base modem so where this field will be placed that's what is we are going to look now we have a notebook let's say do we have that notebook here we can take this yes there is a notebook so what we provided his notebook the position is equal to inside okay so this element that comes under this notebook pack will be placed inside the notebook tag that we have under this mu partner for so the it will be as a page so the page string will be sessions and it will have two columns instructor and session IDs sorry two fields inside that page it will be instructor it will be a check box and the session IDs and we have put an action conducts restore poetry form and it will be under the configuration menu of will be under the configuration menu and the contact me know okay so we can check what will happen when we updated the module so before upgrading the module you may remember that we have to add this hard not wrote XML file in our manifest okay so so we have that file reference here in under or manifest let's restart our service sorry project let's say our configuration that is contacts okay so we have our contact list here let's say we have our sessions which yes we have and we have an instructor column that we can check okay and we have sessions that these contacts that means these rest or partner objects ow I think it so this is how the normal class inheritance works we will discuss the next items next inheritance mother in the coming videos thanks for watching I hope you may have subscribe the channel to get the latest updates if you don't please subscribe our channel if you are interested in knowing more 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